* [PATCH v3 0/5] target_version and aarch64 function multiversioning
@ 2023-12-06 12:43 Andrew Carlotti
2023-12-06 12:44 ` [1/5] aarch64: Add cpu feature detection to libgcc Andrew Carlotti
` (4 more replies)
0 siblings, 5 replies; 11+ messages in thread
From: Andrew Carlotti @ 2023-12-06 12:43 UTC (permalink / raw)
To: gcc-patches; +Cc: Richard Biener, Richard Sandiford
This series adds support for function multiversioning on aarch64.
Patches 1-3 are already approved, with just one minor change from the previous
version of patch 1 suggested by Richard Sandiford.
Patches 4-5 are updated based on Richard's reviews. The only major change is
replacing the EXPANDED_CLONES_ATTRIBUTE target hook with the
TARGET_HAS_FMV_TARGET_ATTRIBUTE macro. I've also reorganised
dispatch_function_versions and aarch64_mangle_decl_assembler_name, along with
several other minor fixes.
The updated series passes regression testing on both aarch64 for C and C++.
The previous version passed testing on x86; I haven't retested it since.
Ok for master?
Thanks,
Andrew
^ permalink raw reply [flat|nested] 11+ messages in thread
* [1/5] aarch64: Add cpu feature detection to libgcc
2023-12-06 12:43 [PATCH v3 0/5] target_version and aarch64 function multiversioning Andrew Carlotti
@ 2023-12-06 12:44 ` Andrew Carlotti
2023-12-06 12:45 ` [PATCH v3 2/5] c-family: Simplify attribute exclusion handling Andrew Carlotti
` (3 subsequent siblings)
4 siblings, 0 replies; 11+ messages in thread
From: Andrew Carlotti @ 2023-12-06 12:44 UTC (permalink / raw)
To: gcc-patches; +Cc: Richard Sandiford
This is added to enable function multiversioning, but can also be used
directly. The interface is chosen to match that used in LLVM's
compiler-rt, to facilitate cross-compiler compatibility.
The content of the patch is derived almost entirely from Pavel's prior
contributions to compiler-rt/lib/builtins/cpu_model.c. I have made minor
changes to align more closely with GCC coding style, and to exclude any code
from other LLVM contributors, and am adding this to GCC with Pavel's approval.
libgcc/ChangeLog:
* config/aarch64/t-aarch64: Include cpuinfo.c
* config/aarch64/cpuinfo.c: New file
(__init_cpu_features_constructor) New.
(__init_cpu_features_resolver) New.
(__init_cpu_features) New.
Co-authored-by: Pavel Iliin <Pavel.Iliin@arm.com>
diff --git a/libgcc/config/aarch64/cpuinfo.c b/libgcc/config/aarch64/cpuinfo.c
new file mode 100644
index 0000000000000000000000000000000000000000..634f591c194bc70048f714d7eb0ace1f2f4137ea
--- /dev/null
+++ b/libgcc/config/aarch64/cpuinfo.c
@@ -0,0 +1,500 @@
+/* CPU feature detection for AArch64 architecture.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+
+ This file is part of GCC.
+
+ This file is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 3, or (at your option) any
+ later version.
+
+ This file is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ Under Section 7 of GPL version 3, you are granted additional
+ permissions described in the GCC Runtime Library Exception, version
+ 3.1, as published by the Free Software Foundation.
+
+ You should have received a copy of the GNU General Public License and
+ a copy of the GCC Runtime Library Exception along with this program;
+ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#if __has_include(<sys/auxv.h>)
+#include <sys/auxv.h>
+
+#if __has_include(<sys/ifunc.h>)
+#include <sys/ifunc.h>
+#else
+typedef struct __ifunc_arg_t {
+ unsigned long _size;
+ unsigned long _hwcap;
+ unsigned long _hwcap2;
+} __ifunc_arg_t;
+#endif
+
+#if __has_include(<asm/hwcap.h>)
+#include <asm/hwcap.h>
+
+/* CPUFeatures must correspond to the same AArch64 features in aarch64.cc */
+enum CPUFeatures {
+ FEAT_RNG,
+ FEAT_FLAGM,
+ FEAT_FLAGM2,
+ FEAT_FP16FML,
+ FEAT_DOTPROD,
+ FEAT_SM4,
+ FEAT_RDM,
+ FEAT_LSE,
+ FEAT_FP,
+ FEAT_SIMD,
+ FEAT_CRC,
+ FEAT_SHA1,
+ FEAT_SHA2,
+ FEAT_SHA3,
+ FEAT_AES,
+ FEAT_PMULL,
+ FEAT_FP16,
+ FEAT_DIT,
+ FEAT_DPB,
+ FEAT_DPB2,
+ FEAT_JSCVT,
+ FEAT_FCMA,
+ FEAT_RCPC,
+ FEAT_RCPC2,
+ FEAT_FRINTTS,
+ FEAT_DGH,
+ FEAT_I8MM,
+ FEAT_BF16,
+ FEAT_EBF16,
+ FEAT_RPRES,
+ FEAT_SVE,
+ FEAT_SVE_BF16,
+ FEAT_SVE_EBF16,
+ FEAT_SVE_I8MM,
+ FEAT_SVE_F32MM,
+ FEAT_SVE_F64MM,
+ FEAT_SVE2,
+ FEAT_SVE_AES,
+ FEAT_SVE_PMULL128,
+ FEAT_SVE_BITPERM,
+ FEAT_SVE_SHA3,
+ FEAT_SVE_SM4,
+ FEAT_SME,
+ FEAT_MEMTAG,
+ FEAT_MEMTAG2,
+ FEAT_MEMTAG3,
+ FEAT_SB,
+ FEAT_PREDRES,
+ FEAT_SSBS,
+ FEAT_SSBS2,
+ FEAT_BTI,
+ FEAT_LS64,
+ FEAT_LS64_V,
+ FEAT_LS64_ACCDATA,
+ FEAT_WFXT,
+ FEAT_SME_F64,
+ FEAT_SME_I64,
+ FEAT_SME2,
+ FEAT_RCPC3,
+ FEAT_MAX,
+ FEAT_EXT = 62, /* Reserved to indicate presence of additional features field
+ in __aarch64_cpu_features. */
+ FEAT_INIT /* Used as flag of features initialization completion. */
+};
+
+/* Architecture features used in Function Multi Versioning. */
+struct {
+ unsigned long long features;
+ /* As features grows new fields could be added. */
+} __aarch64_cpu_features __attribute__((visibility("hidden"), nocommon));
+
+#ifndef _IFUNC_ARG_HWCAP
+#define _IFUNC_ARG_HWCAP (1ULL << 62)
+#endif
+#ifndef AT_HWCAP
+#define AT_HWCAP 16
+#endif
+#ifndef HWCAP_CPUID
+#define HWCAP_CPUID (1 << 11)
+#endif
+#ifndef HWCAP_FP
+#define HWCAP_FP (1 << 0)
+#endif
+#ifndef HWCAP_ASIMD
+#define HWCAP_ASIMD (1 << 1)
+#endif
+#ifndef HWCAP_AES
+#define HWCAP_AES (1 << 3)
+#endif
+#ifndef HWCAP_PMULL
+#define HWCAP_PMULL (1 << 4)
+#endif
+#ifndef HWCAP_SHA1
+#define HWCAP_SHA1 (1 << 5)
+#endif
+#ifndef HWCAP_SHA2
+#define HWCAP_SHA2 (1 << 6)
+#endif
+#ifndef HWCAP_ATOMICS
+#define HWCAP_ATOMICS (1 << 8)
+#endif
+#ifndef HWCAP_FPHP
+#define HWCAP_FPHP (1 << 9)
+#endif
+#ifndef HWCAP_ASIMDHP
+#define HWCAP_ASIMDHP (1 << 10)
+#endif
+#ifndef HWCAP_ASIMDRDM
+#define HWCAP_ASIMDRDM (1 << 12)
+#endif
+#ifndef HWCAP_JSCVT
+#define HWCAP_JSCVT (1 << 13)
+#endif
+#ifndef HWCAP_FCMA
+#define HWCAP_FCMA (1 << 14)
+#endif
+#ifndef HWCAP_LRCPC
+#define HWCAP_LRCPC (1 << 15)
+#endif
+#ifndef HWCAP_DCPOP
+#define HWCAP_DCPOP (1 << 16)
+#endif
+#ifndef HWCAP_SHA3
+#define HWCAP_SHA3 (1 << 17)
+#endif
+#ifndef HWCAP_SM3
+#define HWCAP_SM3 (1 << 18)
+#endif
+#ifndef HWCAP_SM4
+#define HWCAP_SM4 (1 << 19)
+#endif
+#ifndef HWCAP_ASIMDDP
+#define HWCAP_ASIMDDP (1 << 20)
+#endif
+#ifndef HWCAP_SHA512
+#define HWCAP_SHA512 (1 << 21)
+#endif
+#ifndef HWCAP_SVE
+#define HWCAP_SVE (1 << 22)
+#endif
+#ifndef HWCAP_ASIMDFHM
+#define HWCAP_ASIMDFHM (1 << 23)
+#endif
+#ifndef HWCAP_DIT
+#define HWCAP_DIT (1 << 24)
+#endif
+#ifndef HWCAP_ILRCPC
+#define HWCAP_ILRCPC (1 << 26)
+#endif
+#ifndef HWCAP_FLAGM
+#define HWCAP_FLAGM (1 << 27)
+#endif
+#ifndef HWCAP_SSBS
+#define HWCAP_SSBS (1 << 28)
+#endif
+#ifndef HWCAP_SB
+#define HWCAP_SB (1 << 29)
+#endif
+
+#ifndef HWCAP2_DCPODP
+#define HWCAP2_DCPODP (1 << 0)
+#endif
+#ifndef HWCAP2_SVE2
+#define HWCAP2_SVE2 (1 << 1)
+#endif
+#ifndef HWCAP2_SVEAES
+#define HWCAP2_SVEAES (1 << 2)
+#endif
+#ifndef HWCAP2_SVEPMULL
+#define HWCAP2_SVEPMULL (1 << 3)
+#endif
+#ifndef HWCAP2_SVEBITPERM
+#define HWCAP2_SVEBITPERM (1 << 4)
+#endif
+#ifndef HWCAP2_SVESHA3
+#define HWCAP2_SVESHA3 (1 << 5)
+#endif
+#ifndef HWCAP2_SVESM4
+#define HWCAP2_SVESM4 (1 << 6)
+#endif
+#ifndef HWCAP2_FLAGM2
+#define HWCAP2_FLAGM2 (1 << 7)
+#endif
+#ifndef HWCAP2_FRINT
+#define HWCAP2_FRINT (1 << 8)
+#endif
+#ifndef HWCAP2_SVEI8MM
+#define HWCAP2_SVEI8MM (1 << 9)
+#endif
+#ifndef HWCAP2_SVEF32MM
+#define HWCAP2_SVEF32MM (1 << 10)
+#endif
+#ifndef HWCAP2_SVEF64MM
+#define HWCAP2_SVEF64MM (1 << 11)
+#endif
+#ifndef HWCAP2_SVEBF16
+#define HWCAP2_SVEBF16 (1 << 12)
+#endif
+#ifndef HWCAP2_I8MM
+#define HWCAP2_I8MM (1 << 13)
+#endif
+#ifndef HWCAP2_BF16
+#define HWCAP2_BF16 (1 << 14)
+#endif
+#ifndef HWCAP2_DGH
+#define HWCAP2_DGH (1 << 15)
+#endif
+#ifndef HWCAP2_RNG
+#define HWCAP2_RNG (1 << 16)
+#endif
+#ifndef HWCAP2_BTI
+#define HWCAP2_BTI (1 << 17)
+#endif
+#ifndef HWCAP2_MTE
+#define HWCAP2_MTE (1 << 18)
+#endif
+#ifndef HWCAP2_RPRES
+#define HWCAP2_RPRES (1 << 21)
+#endif
+#ifndef HWCAP2_MTE3
+#define HWCAP2_MTE3 (1 << 22)
+#endif
+#ifndef HWCAP2_SME
+#define HWCAP2_SME (1 << 23)
+#endif
+#ifndef HWCAP2_SME_I16I64
+#define HWCAP2_SME_I16I64 (1 << 24)
+#endif
+#ifndef HWCAP2_SME_F64F64
+#define HWCAP2_SME_F64F64 (1 << 25)
+#endif
+#ifndef HWCAP2_WFXT
+#define HWCAP2_WFXT (1UL << 31)
+#endif
+#ifndef HWCAP2_EBF16
+#define HWCAP2_EBF16 (1UL << 32)
+#endif
+#ifndef HWCAP2_SVE_EBF16
+#define HWCAP2_SVE_EBF16 (1UL << 33)
+#endif
+
+static void
+__init_cpu_features_constructor(unsigned long hwcap,
+ const __ifunc_arg_t *arg) {
+#define setCPUFeature(F) __aarch64_cpu_features.features |= 1ULL << F
+#define getCPUFeature(id, ftr) __asm__("mrs %0, " #id : "=r"(ftr))
+#define extractBits(val, start, number) \
+ (val & ((1ULL << number) - 1ULL) << start) >> start
+ unsigned long hwcap2 = 0;
+ if (hwcap & _IFUNC_ARG_HWCAP)
+ hwcap2 = arg->_hwcap2;
+ if (hwcap & HWCAP_CRC32)
+ setCPUFeature(FEAT_CRC);
+ if (hwcap & HWCAP_PMULL)
+ setCPUFeature(FEAT_PMULL);
+ if (hwcap & HWCAP_FLAGM)
+ setCPUFeature(FEAT_FLAGM);
+ if (hwcap2 & HWCAP2_FLAGM2) {
+ setCPUFeature(FEAT_FLAGM);
+ setCPUFeature(FEAT_FLAGM2);
+ }
+ if (hwcap & HWCAP_SM3 && hwcap & HWCAP_SM4)
+ setCPUFeature(FEAT_SM4);
+ if (hwcap & HWCAP_ASIMDDP)
+ setCPUFeature(FEAT_DOTPROD);
+ if (hwcap & HWCAP_ASIMDFHM)
+ setCPUFeature(FEAT_FP16FML);
+ if (hwcap & HWCAP_FPHP) {
+ setCPUFeature(FEAT_FP16);
+ setCPUFeature(FEAT_FP);
+ }
+ if (hwcap & HWCAP_DIT)
+ setCPUFeature(FEAT_DIT);
+ if (hwcap & HWCAP_ASIMDRDM)
+ setCPUFeature(FEAT_RDM);
+ if (hwcap & HWCAP_ILRCPC)
+ setCPUFeature(FEAT_RCPC2);
+ if (hwcap & HWCAP_AES)
+ setCPUFeature(FEAT_AES);
+ if (hwcap & HWCAP_SHA1)
+ setCPUFeature(FEAT_SHA1);
+ if (hwcap & HWCAP_SHA2)
+ setCPUFeature(FEAT_SHA2);
+ if (hwcap & HWCAP_JSCVT)
+ setCPUFeature(FEAT_JSCVT);
+ if (hwcap & HWCAP_FCMA)
+ setCPUFeature(FEAT_FCMA);
+ if (hwcap & HWCAP_SB)
+ setCPUFeature(FEAT_SB);
+ if (hwcap & HWCAP_SSBS)
+ setCPUFeature(FEAT_SSBS2);
+ if (hwcap2 & HWCAP2_MTE) {
+ setCPUFeature(FEAT_MEMTAG);
+ setCPUFeature(FEAT_MEMTAG2);
+ }
+ if (hwcap2 & HWCAP2_MTE3) {
+ setCPUFeature(FEAT_MEMTAG);
+ setCPUFeature(FEAT_MEMTAG2);
+ setCPUFeature(FEAT_MEMTAG3);
+ }
+ if (hwcap2 & HWCAP2_SVEAES)
+ setCPUFeature(FEAT_SVE_AES);
+ if (hwcap2 & HWCAP2_SVEPMULL) {
+ setCPUFeature(FEAT_SVE_AES);
+ setCPUFeature(FEAT_SVE_PMULL128);
+ }
+ if (hwcap2 & HWCAP2_SVEBITPERM)
+ setCPUFeature(FEAT_SVE_BITPERM);
+ if (hwcap2 & HWCAP2_SVESHA3)
+ setCPUFeature(FEAT_SVE_SHA3);
+ if (hwcap2 & HWCAP2_SVESM4)
+ setCPUFeature(FEAT_SVE_SM4);
+ if (hwcap2 & HWCAP2_DCPODP)
+ setCPUFeature(FEAT_DPB2);
+ if (hwcap & HWCAP_ATOMICS)
+ setCPUFeature(FEAT_LSE);
+ if (hwcap2 & HWCAP2_RNG)
+ setCPUFeature(FEAT_RNG);
+ if (hwcap2 & HWCAP2_I8MM)
+ setCPUFeature(FEAT_I8MM);
+ if (hwcap2 & HWCAP2_EBF16)
+ setCPUFeature(FEAT_EBF16);
+ if (hwcap2 & HWCAP2_SVE_EBF16)
+ setCPUFeature(FEAT_SVE_EBF16);
+ if (hwcap2 & HWCAP2_DGH)
+ setCPUFeature(FEAT_DGH);
+ if (hwcap2 & HWCAP2_FRINT)
+ setCPUFeature(FEAT_FRINTTS);
+ if (hwcap2 & HWCAP2_SVEI8MM)
+ setCPUFeature(FEAT_SVE_I8MM);
+ if (hwcap2 & HWCAP2_SVEF32MM)
+ setCPUFeature(FEAT_SVE_F32MM);
+ if (hwcap2 & HWCAP2_SVEF64MM)
+ setCPUFeature(FEAT_SVE_F64MM);
+ if (hwcap2 & HWCAP2_BTI)
+ setCPUFeature(FEAT_BTI);
+ if (hwcap2 & HWCAP2_RPRES)
+ setCPUFeature(FEAT_RPRES);
+ if (hwcap2 & HWCAP2_WFXT)
+ setCPUFeature(FEAT_WFXT);
+ if (hwcap2 & HWCAP2_SME)
+ setCPUFeature(FEAT_SME);
+ if (hwcap2 & HWCAP2_SME_I16I64)
+ setCPUFeature(FEAT_SME_I64);
+ if (hwcap2 & HWCAP2_SME_F64F64)
+ setCPUFeature(FEAT_SME_F64);
+ if (hwcap & HWCAP_CPUID) {
+ unsigned long ftr;
+ getCPUFeature(ID_AA64PFR1_EL1, ftr);
+ /* ID_AA64PFR1_EL1.MTE >= 0b0001 */
+ if (extractBits(ftr, 8, 4) >= 0x1)
+ setCPUFeature(FEAT_MEMTAG);
+ /* ID_AA64PFR1_EL1.SSBS == 0b0001 */
+ if (extractBits(ftr, 4, 4) == 0x1)
+ setCPUFeature(FEAT_SSBS);
+ /* ID_AA64PFR1_EL1.SME == 0b0010 */
+ if (extractBits(ftr, 24, 4) == 0x2)
+ setCPUFeature(FEAT_SME2);
+ getCPUFeature(ID_AA64PFR0_EL1, ftr);
+ /* ID_AA64PFR0_EL1.FP != 0b1111 */
+ if (extractBits(ftr, 16, 4) != 0xF) {
+ setCPUFeature(FEAT_FP);
+ /* ID_AA64PFR0_EL1.AdvSIMD has the same value as ID_AA64PFR0_EL1.FP */
+ setCPUFeature(FEAT_SIMD);
+ }
+ /* ID_AA64PFR0_EL1.SVE != 0b0000 */
+ if (extractBits(ftr, 32, 4) != 0x0) {
+ /* get ID_AA64ZFR0_EL1, that name supported if sve enabled only */
+ getCPUFeature(S3_0_C0_C4_4, ftr);
+ /* ID_AA64ZFR0_EL1.SVEver == 0b0000 */
+ if (extractBits(ftr, 0, 4) == 0x0)
+ setCPUFeature(FEAT_SVE);
+ /* ID_AA64ZFR0_EL1.SVEver == 0b0001 */
+ if (extractBits(ftr, 0, 4) == 0x1)
+ setCPUFeature(FEAT_SVE2);
+ /* ID_AA64ZFR0_EL1.BF16 != 0b0000 */
+ if (extractBits(ftr, 20, 4) != 0x0)
+ setCPUFeature(FEAT_SVE_BF16);
+ }
+ getCPUFeature(ID_AA64ISAR0_EL1, ftr);
+ /* ID_AA64ISAR0_EL1.SHA3 != 0b0000 */
+ if (extractBits(ftr, 32, 4) != 0x0)
+ setCPUFeature(FEAT_SHA3);
+ getCPUFeature(ID_AA64ISAR1_EL1, ftr);
+ /* ID_AA64ISAR1_EL1.DPB >= 0b0001 */
+ if (extractBits(ftr, 0, 4) >= 0x1)
+ setCPUFeature(FEAT_DPB);
+ /* ID_AA64ISAR1_EL1.LRCPC != 0b0000 */
+ if (extractBits(ftr, 20, 4) != 0x0)
+ setCPUFeature(FEAT_RCPC);
+ /* ID_AA64ISAR1_EL1.LRCPC == 0b0011 */
+ if (extractBits(ftr, 20, 4) == 0x3)
+ setCPUFeature(FEAT_RCPC3);
+ /* ID_AA64ISAR1_EL1.SPECRES == 0b0001 */
+ if (extractBits(ftr, 40, 4) == 0x2)
+ setCPUFeature(FEAT_PREDRES);
+ /* ID_AA64ISAR1_EL1.BF16 != 0b0000 */
+ if (extractBits(ftr, 44, 4) != 0x0)
+ setCPUFeature(FEAT_BF16);
+ /* ID_AA64ISAR1_EL1.LS64 >= 0b0001 */
+ if (extractBits(ftr, 60, 4) >= 0x1)
+ setCPUFeature(FEAT_LS64);
+ /* ID_AA64ISAR1_EL1.LS64 >= 0b0010 */
+ if (extractBits(ftr, 60, 4) >= 0x2)
+ setCPUFeature(FEAT_LS64_V);
+ /* ID_AA64ISAR1_EL1.LS64 >= 0b0011 */
+ if (extractBits(ftr, 60, 4) >= 0x3)
+ setCPUFeature(FEAT_LS64_ACCDATA);
+ } else {
+ /* Set some features in case of no CPUID support. */
+ if (hwcap & (HWCAP_FP | HWCAP_FPHP)) {
+ setCPUFeature(FEAT_FP);
+ /* FP and AdvSIMD fields have the same value. */
+ setCPUFeature(FEAT_SIMD);
+ }
+ if (hwcap & HWCAP_DCPOP || hwcap2 & HWCAP2_DCPODP)
+ setCPUFeature(FEAT_DPB);
+ if (hwcap & HWCAP_LRCPC || hwcap & HWCAP_ILRCPC)
+ setCPUFeature(FEAT_RCPC);
+ if (hwcap2 & HWCAP2_BF16 || hwcap2 & HWCAP2_EBF16)
+ setCPUFeature(FEAT_BF16);
+ if (hwcap2 & HWCAP2_SVEBF16)
+ setCPUFeature(FEAT_SVE_BF16);
+ if (hwcap2 & HWCAP2_SVE2 && hwcap & HWCAP_SVE)
+ setCPUFeature(FEAT_SVE2);
+ if (hwcap & HWCAP_SHA3)
+ setCPUFeature(FEAT_SHA3);
+ }
+ setCPUFeature(FEAT_INIT);
+}
+
+void
+__init_cpu_features_resolver(unsigned long hwcap, const __ifunc_arg_t *arg) {
+ if (__aarch64_cpu_features.features)
+ return;
+ __init_cpu_features_constructor(hwcap, arg);
+}
+
+void __attribute__ ((constructor))
+__init_cpu_features(void) {
+ unsigned long hwcap;
+ unsigned long hwcap2;
+ /* CPU features already initialized. */
+ if (__aarch64_cpu_features.features)
+ return;
+ hwcap = getauxval(AT_HWCAP);
+ hwcap2 = getauxval(AT_HWCAP2);
+ __ifunc_arg_t arg;
+ arg._size = sizeof(__ifunc_arg_t);
+ arg._hwcap = hwcap;
+ arg._hwcap2 = hwcap2;
+ __init_cpu_features_constructor(hwcap | _IFUNC_ARG_HWCAP, &arg);
+#undef extractBits
+#undef getCPUFeature
+#undef setCPUFeature
+}
+#endif /* __has_include(<asm/hwcap.h>) */
+#endif /* __has_include(<sys/auxv.h>) */
diff --git a/libgcc/config/aarch64/t-aarch64 b/libgcc/config/aarch64/t-aarch64
index a40b6241c86ecc4007b5cfd28aa989ee894aa410..8bc1a4ca0c2eb75c17e62a25aa45a875bfd472f8 100644
--- a/libgcc/config/aarch64/t-aarch64
+++ b/libgcc/config/aarch64/t-aarch64
@@ -19,3 +19,4 @@
# <http://www.gnu.org/licenses/>.
LIB2ADD += $(srcdir)/config/aarch64/sync-cache.c
+LIB2ADD += $(srcdir)/config/aarch64/cpuinfo.c
^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH v3 2/5] c-family: Simplify attribute exclusion handling
2023-12-06 12:43 [PATCH v3 0/5] target_version and aarch64 function multiversioning Andrew Carlotti
2023-12-06 12:44 ` [1/5] aarch64: Add cpu feature detection to libgcc Andrew Carlotti
@ 2023-12-06 12:45 ` Andrew Carlotti
2023-12-06 12:45 ` [PATCH v3 3/5] ada: Improve " Andrew Carlotti
` (2 subsequent siblings)
4 siblings, 0 replies; 11+ messages in thread
From: Andrew Carlotti @ 2023-12-06 12:45 UTC (permalink / raw)
To: gcc-patches
This patch changes the handling of mutual exclusions involving the
target and target_clones attributes to use the generic attribute
exclusion lists. Additionally, the duplicate handling for the
always_inline and noinline attribute exclusion is removed.
The only change in functionality is the choice of warning message
displayed - due to either a change in the wording for mutual exclusion
warnings, or a change in the order in which different checks occur.
gcc/c-family/ChangeLog:
* c-attribs.cc (attr_always_inline_exclusions): New.
(attr_target_exclusions): Ditto.
(attr_target_clones_exclusions): Ditto.
(c_common_attribute_table): Add new exclusion lists.
(handle_noinline_attribute): Remove custom exclusion handling.
(handle_always_inline_attribute): Ditto.
(handle_target_attribute): Ditto.
(handle_target_clones_attribute): Ditto.
gcc/testsuite/ChangeLog:
* g++.target/i386/mvc2.C:
* g++.target/i386/mvc3.C:
diff --git a/gcc/c-family/c-attribs.cc b/gcc/c-family/c-attribs.cc
index 461732f60f7c4031cc6692000fbdddb9f726a035..b3b41ef123a0f171f57acb1b7f7fdde716428c00 100644
--- a/gcc/c-family/c-attribs.cc
+++ b/gcc/c-family/c-attribs.cc
@@ -214,6 +214,13 @@ static const struct attribute_spec::exclusions attr_inline_exclusions[] =
ATTR_EXCL (NULL, false, false, false),
};
+static const struct attribute_spec::exclusions attr_always_inline_exclusions[] =
+{
+ ATTR_EXCL ("noinline", true, true, true),
+ ATTR_EXCL ("target_clones", true, true, true),
+ ATTR_EXCL (NULL, false, false, false),
+};
+
static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
{
ATTR_EXCL ("always_inline", true, true, true),
@@ -221,6 +228,19 @@ static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
ATTR_EXCL (NULL, false, false, false),
};
+static const struct attribute_spec::exclusions attr_target_exclusions[] =
+{
+ ATTR_EXCL ("target_clones", true, true, true),
+ ATTR_EXCL (NULL, false, false, false),
+};
+
+static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
+{
+ ATTR_EXCL ("always_inline", true, true, true),
+ ATTR_EXCL ("target", true, true, true),
+ ATTR_EXCL (NULL, false, false, false),
+};
+
extern const struct attribute_spec::exclusions attr_noreturn_exclusions[] =
{
ATTR_EXCL ("alloc_align", true, true, true),
@@ -332,7 +352,7 @@ const struct attribute_spec c_common_attribute_table[] =
handle_leaf_attribute, NULL },
{ "always_inline", 0, 0, true, false, false, false,
handle_always_inline_attribute,
- attr_inline_exclusions },
+ attr_always_inline_exclusions },
{ "gnu_inline", 0, 0, true, false, false, false,
handle_gnu_inline_attribute,
attr_inline_exclusions },
@@ -483,9 +503,11 @@ const struct attribute_spec c_common_attribute_table[] =
{ "error", 1, 1, true, false, false, false,
handle_error_attribute, NULL },
{ "target", 1, -1, true, false, false, false,
- handle_target_attribute, NULL },
+ handle_target_attribute,
+ attr_target_exclusions },
{ "target_clones", 1, -1, true, false, false, false,
- handle_target_clones_attribute, NULL },
+ handle_target_clones_attribute,
+ attr_target_clones_exclusions },
{ "optimize", 1, -1, true, false, false, false,
handle_optimize_attribute, NULL },
/* For internal use only. The leading '*' both prevents its usage in
@@ -1397,16 +1419,7 @@ handle_noinline_attribute (tree *node, tree name,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL)
- {
- if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node)))
- {
- warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
- "with attribute %qs", name, "always_inline");
- *no_add_attrs = true;
- }
- else
- DECL_UNINLINABLE (*node) = 1;
- }
+ DECL_UNINLINABLE (*node) = 1;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
@@ -1487,22 +1500,9 @@ handle_always_inline_attribute (tree *node, tree name,
{
if (TREE_CODE (*node) == FUNCTION_DECL)
{
- if (lookup_attribute ("noinline", DECL_ATTRIBUTES (*node)))
- {
- warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
- "with %qs attribute", name, "noinline");
- *no_add_attrs = true;
- }
- else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (*node)))
- {
- warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
- "with %qs attribute", name, "target_clones");
- *no_add_attrs = true;
- }
- else
- /* Set the attribute and mark it for disregarding inline
- limits. */
- DECL_DISREGARD_INLINE_LIMITS (*node) = 1;
+ /* Set the attribute and mark it for disregarding inline
+ limits. */
+ DECL_DISREGARD_INLINE_LIMITS (*node) = 1;
}
else
{
@@ -5650,12 +5650,6 @@ handle_target_attribute (tree *node, tree name, tree args, int flags,
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
- else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (*node)))
- {
- warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
- "with %qs attribute", name, "target_clones");
- *no_add_attrs = true;
- }
else if (! targetm.target_option.valid_attribute_p (*node, name, args,
flags))
*no_add_attrs = true;
@@ -5696,19 +5690,7 @@ handle_target_clones_attribute (tree *node, tree name, tree ARG_UNUSED (args),
}
}
- if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node)))
- {
- warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
- "with %qs attribute", name, "always_inline");
- *no_add_attrs = true;
- }
- else if (lookup_attribute ("target", DECL_ATTRIBUTES (*node)))
- {
- warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
- "with %qs attribute", name, "target");
- *no_add_attrs = true;
- }
- else if (get_target_clone_attr_len (args) == -1)
+ if (get_target_clone_attr_len (args) == -1)
{
warning (OPT_Wattributes,
"single %<target_clones%> attribute is ignored");
diff --git a/gcc/testsuite/g++.target/i386/mvc2.C b/gcc/testsuite/g++.target/i386/mvc2.C
index 7c1fb6518d04f404123086660c32853dcd9f65ba..04ee0573d607f6de2e7ea382e891f62884c18ea7 100644
--- a/gcc/testsuite/g++.target/i386/mvc2.C
+++ b/gcc/testsuite/g++.target/i386/mvc2.C
@@ -3,7 +3,7 @@
__attribute__((target_clones("avx","arch=slm","default")))
__attribute__((target("avx")))
-int foo (); /* { dg-warning "'target' attribute ignored due to conflict with 'target_clones' attribute" } */
+int foo (); /* { dg-warning "ignoring attribute 'target' because it conflicts with attribute 'target_clones'" } */
__attribute__((target_clones("avx","arch=slm","default"),always_inline))
-int bar (); /* { dg-warning "'always_inline' attribute ignored due to conflict with 'target_clones' attribute" } */
+int bar (); /* { dg-warning "ignoring attribute 'always_inline' because it conflicts with attribute 'target_clones'" } */
diff --git a/gcc/testsuite/g++.target/i386/mvc3.C b/gcc/testsuite/g++.target/i386/mvc3.C
index 5d634fd7ea68b905a0e93ca1c25f6907bc9d2858..5ad1f88fd2d7da74fafcafcff24b77cb2d12a5a0 100644
--- a/gcc/testsuite/g++.target/i386/mvc3.C
+++ b/gcc/testsuite/g++.target/i386/mvc3.C
@@ -3,7 +3,7 @@
__attribute__((target("avx")))
__attribute__((target_clones("avx","arch=slm","default")))
-int foo (); /* { dg-warning "'target_clones' attribute ignored due to conflict with 'target' attribute" } */
+int foo (); /* { dg-warning "ignoring attribute 'target_clones' because it conflicts with attribute 'target'" } */
__attribute__((always_inline,target_clones("avx","arch=slm","default")))
-int bar (); /* { dg-warning "'target_clones' attribute ignored due to conflict with 'always_inline' attribute" } */
+int bar (); /* { dg-warning "ignoring attribute 'target_clones' because it conflicts with attribute 'always_inline'" } */
^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH v3 3/5] ada: Improve attribute exclusion handling
2023-12-06 12:43 [PATCH v3 0/5] target_version and aarch64 function multiversioning Andrew Carlotti
2023-12-06 12:44 ` [1/5] aarch64: Add cpu feature detection to libgcc Andrew Carlotti
2023-12-06 12:45 ` [PATCH v3 2/5] c-family: Simplify attribute exclusion handling Andrew Carlotti
@ 2023-12-06 12:45 ` Andrew Carlotti
2023-12-06 12:46 ` [PATCH v3 4/5] Add support for target_version attribute Andrew Carlotti
2023-12-06 12:47 ` [PATCH v3 5/5] aarch64: Add function multiversioning support Andrew Carlotti
4 siblings, 0 replies; 11+ messages in thread
From: Andrew Carlotti @ 2023-12-06 12:45 UTC (permalink / raw)
To: gcc-patches
Change the handling of some attribute mutual exclusions to use the
generic attribute exclusion lists, and fix some asymmetric exclusions by
adding the exclusions for always_inline after noinline or target_clones.
Aside from the new always_inline exclusions, the only change is
functionality is the choice of warning message displayed. All warnings
about attribute mutual exclusions now use the same message.
gcc/ada/ChangeLog:
* gcc-interface/utils.cc (attr_noinline_exclusions): New.
(attr_always_inline_exclusions): Ditto.
(attr_target_exclusions): Ditto.
(attr_target_clones_exclusions): Ditto.
(gnat_internal_attribute_table): Add new exclusion lists.
(handle_noinline_attribute): Remove custom exclusion handling.
(handle_target_attribute): Ditto.
(handle_target_clones_attribute): Ditto.
diff --git a/gcc/ada/gcc-interface/utils.cc b/gcc/ada/gcc-interface/utils.cc
index e7b5c7783b1f1c702130c8879c79b7e329764b09..f2c504ddf8d3df11abe81aec695c9eea0b39da6c 100644
--- a/gcc/ada/gcc-interface/utils.cc
+++ b/gcc/ada/gcc-interface/utils.cc
@@ -130,6 +130,32 @@ static const struct attribute_spec::exclusions attr_stack_protect_exclusions[] =
{ NULL, false, false, false },
};
+static const struct attribute_spec::exclusions attr_always_inline_exclusions[] =
+{
+ { "noinline", true, true, true },
+ { "target_clones", true, true, true },
+ { NULL, false, false, false },
+};
+
+static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
+{
+ { "always_inline", true, true, true },
+ { NULL, false, false, false },
+};
+
+static const struct attribute_spec::exclusions attr_target_exclusions[] =
+{
+ { "target_clones", true, true, true },
+ { NULL, false, false, false },
+};
+
+static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
+{
+ { "always_inline", true, true, true },
+ { "target", true, true, true },
+ { NULL, false, false, false },
+};
+
/* Fake handler for attributes we don't properly support, typically because
they'd require dragging a lot of the common-c front-end circuitry. */
static tree fake_attribute_handler (tree *, tree, tree, int, bool *);
@@ -165,7 +191,7 @@ const struct attribute_spec gnat_internal_attribute_table[] =
{ "strub", 0, 1, false, true, false, true,
handle_strub_attribute, NULL },
{ "noinline", 0, 0, true, false, false, false,
- handle_noinline_attribute, NULL },
+ handle_noinline_attribute, attr_noinline_exclusions },
{ "noclone", 0, 0, true, false, false, false,
handle_noclone_attribute, NULL },
{ "no_icf", 0, 0, true, false, false, false,
@@ -175,7 +201,7 @@ const struct attribute_spec gnat_internal_attribute_table[] =
{ "leaf", 0, 0, true, false, false, false,
handle_leaf_attribute, NULL },
{ "always_inline",0, 0, true, false, false, false,
- handle_always_inline_attribute, NULL },
+ handle_always_inline_attribute, attr_always_inline_exclusions },
{ "malloc", 0, 0, true, false, false, false,
handle_malloc_attribute, NULL },
{ "type generic", 0, 0, false, true, true, false,
@@ -192,9 +218,9 @@ const struct attribute_spec gnat_internal_attribute_table[] =
{ "simd", 0, 1, true, false, false, false,
handle_simd_attribute, NULL },
{ "target", 1, -1, true, false, false, false,
- handle_target_attribute, NULL },
+ handle_target_attribute, attr_target_exclusions },
{ "target_clones",1, -1, true, false, false, false,
- handle_target_clones_attribute, NULL },
+ handle_target_clones_attribute, attr_target_clones_exclusions },
{ "vector_size", 1, 1, false, true, false, false,
handle_vector_size_attribute, NULL },
@@ -6755,16 +6781,7 @@ handle_noinline_attribute (tree *node, tree name,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL)
- {
- if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node)))
- {
- warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
- "with attribute %qs", name, "always_inline");
- *no_add_attrs = true;
- }
- else
- DECL_UNINLINABLE (*node) = 1;
- }
+ DECL_UNINLINABLE (*node) = 1;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
@@ -7063,12 +7080,6 @@ handle_target_attribute (tree *node, tree name, tree args, int flags,
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
- else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (*node)))
- {
- warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
- "with %qs attribute", name, "target_clones");
- *no_add_attrs = true;
- }
else if (!targetm.target_option.valid_attribute_p (*node, name, args, flags))
*no_add_attrs = true;
@@ -7096,23 +7107,8 @@ handle_target_clones_attribute (tree *node, tree name, tree ARG_UNUSED (args),
{
/* Ensure we have a function type. */
if (TREE_CODE (*node) == FUNCTION_DECL)
- {
- if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node)))
- {
- warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
- "with %qs attribute", name, "always_inline");
- *no_add_attrs = true;
- }
- else if (lookup_attribute ("target", DECL_ATTRIBUTES (*node)))
- {
- warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
- "with %qs attribute", name, "target");
- *no_add_attrs = true;
- }
- else
- /* Do not inline functions with multiple clone targets. */
- DECL_UNINLINABLE (*node) = 1;
- }
+ /* Do not inline functions with multiple clone targets. */
+ DECL_UNINLINABLE (*node) = 1;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH v3 4/5] Add support for target_version attribute
2023-12-06 12:43 [PATCH v3 0/5] target_version and aarch64 function multiversioning Andrew Carlotti
` (2 preceding siblings ...)
2023-12-06 12:45 ` [PATCH v3 3/5] ada: Improve " Andrew Carlotti
@ 2023-12-06 12:46 ` Andrew Carlotti
2023-12-14 14:58 ` Richard Sandiford
2023-12-06 12:47 ` [PATCH v3 5/5] aarch64: Add function multiversioning support Andrew Carlotti
4 siblings, 1 reply; 11+ messages in thread
From: Andrew Carlotti @ 2023-12-06 12:46 UTC (permalink / raw)
To: gcc-patches; +Cc: Richard Biener, Richard Sandiford
This patch adds support for the "target_version" attribute to the middle
end and the C++ frontend, which will be used to implement function
multiversioning in the aarch64 backend.
On targets that don't use the "target" attribute for multiversioning,
there is no conflict between the "target" and "target_clones"
attributes. This patch therefore makes the mutual exclusion in
C-family, D and Ada conditonal upon the value of the
expanded_clones_attribute target hook.
The "target_version" attribute is only added to C++ in this patch,
because this is currently the only frontend which supports
multiversioning using the "target" attribute. Support for the
"target_version" attribute will be extended to C at a later date.
Targets that currently use the "target" attribute for function
multiversioning (i.e. i386 and rs6000) are not affected by this patch.
Ok for master?
gcc/ChangeLog:
* attribs.cc (decl_attributes): Pass attribute name to target.
(is_function_default_version): Update comment to specify
incompatibility with target_version attributes.
* cgraphclones.cc (cgraph_node::create_version_clone_with_body):
Call valid_version_attribute_p for target_version attributes.
* defaults.h (TARGET_HAS_FMV_TARGET_ATTRIBUTE): New macro.
* target.def (valid_version_attribute_p): New hook.
* doc/tm.texi.in: Add new hook.
* doc/tm.texi: Regenerate.
* multiple_target.cc (create_dispatcher_calls): Remove redundant
is_function_default_version check.
(expand_target_clones): Use target macro to pick attribute name.
* targhooks.cc (default_target_option_valid_version_attribute_p):
New.
* targhooks.h (default_target_option_valid_version_attribute_p):
New.
* tree.h (DECL_FUNCTION_VERSIONED): Update comment to include
target_version attributes.
gcc/c-family/ChangeLog:
* c-attribs.cc (attr_target_exclusions): Make
target/target_clones exclusion target-dependent.
(attr_target_clones_exclusions): Ditto, and add target_version.
(attr_target_version_exclusions): New.
(c_common_attribute_table): Add target_version.
(handle_target_version_attribute): New.
gcc/ada/ChangeLog:
* gcc-interface/utils.cc (attr_target_exclusions): Make
target/target_clones exclusion target-dependent.
(attr_target_clones_exclusions): Ditto.
gcc/d/ChangeLog:
* d-attribs.cc (attr_target_exclusions): Make
target/target_clones exclusion target-dependent.
(attr_target_clones_exclusions): Ditto.
gcc/cp/ChangeLog:
* decl2.cc (check_classfn): Update comment to include
target_version attributes.
diff --git a/gcc/ada/gcc-interface/utils.cc b/gcc/ada/gcc-interface/utils.cc
index f2c504ddf8d3df11abe81aec695c9eea0b39da6c..5d946c33b212c5ea50e7a73524e8c1d062280956 100644
--- a/gcc/ada/gcc-interface/utils.cc
+++ b/gcc/ada/gcc-interface/utils.cc
@@ -145,14 +145,16 @@ static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
static const struct attribute_spec::exclusions attr_target_exclusions[] =
{
- { "target_clones", true, true, true },
+ { "target_clones", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE },
{ NULL, false, false, false },
};
static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
{
{ "always_inline", true, true, true },
- { "target", true, true, true },
+ { "target", TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE },
{ NULL, false, false, false },
};
diff --git a/gcc/attribs.cc b/gcc/attribs.cc
index c7209c26acc9faf699774b0ef669ec6748b9073d..19cccf2d7ca4fdd6a46a01884393c6779333dbc5 100644
--- a/gcc/attribs.cc
+++ b/gcc/attribs.cc
@@ -657,7 +657,8 @@ decl_attributes (tree *node, tree attributes, int flags,
options to the attribute((target(...))) list. */
if (TREE_CODE (*node) == FUNCTION_DECL
&& current_target_pragma
- && targetm.target_option.valid_attribute_p (*node, NULL_TREE,
+ && targetm.target_option.valid_attribute_p (*node,
+ get_identifier ("target"),
current_target_pragma, 0))
{
tree cur_attr = lookup_attribute ("target", attributes);
@@ -1241,8 +1242,9 @@ make_dispatcher_decl (const tree decl)
return func_decl;
}
-/* Returns true if decl is multi-versioned and DECL is the default function,
- that is it is not tagged with target specific optimization. */
+/* Returns true if DECL is multi-versioned using the target attribute, and this
+ is the default version. This function can only be used for targets that do
+ not support the "target_version" attribute. */
bool
is_function_default_version (const tree decl)
diff --git a/gcc/c-family/c-attribs.cc b/gcc/c-family/c-attribs.cc
index b3b41ef123a0f171f57acb1b7f7fdde716428c00..eabc11c00f09125b7d6e2c47f3b083a03909825c 100644
--- a/gcc/c-family/c-attribs.cc
+++ b/gcc/c-family/c-attribs.cc
@@ -149,6 +149,7 @@ static tree handle_alloc_align_attribute (tree *, tree, tree, int, bool *);
static tree handle_assume_aligned_attribute (tree *, tree, tree, int, bool *);
static tree handle_assume_attribute (tree *, tree, tree, int, bool *);
static tree handle_target_attribute (tree *, tree, tree, int, bool *);
+static tree handle_target_version_attribute (tree *, tree, tree, int, bool *);
static tree handle_target_clones_attribute (tree *, tree, tree, int, bool *);
static tree handle_optimize_attribute (tree *, tree, tree, int, bool *);
static tree ignore_attribute (tree *, tree, tree, int, bool *);
@@ -230,14 +231,23 @@ static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
static const struct attribute_spec::exclusions attr_target_exclusions[] =
{
- ATTR_EXCL ("target_clones", true, true, true),
+ ATTR_EXCL ("target_clones", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
ATTR_EXCL (NULL, false, false, false),
};
static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
{
ATTR_EXCL ("always_inline", true, true, true),
- ATTR_EXCL ("target", true, true, true),
+ ATTR_EXCL ("target", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
+ ATTR_EXCL ("target_version", true, true, true),
+ ATTR_EXCL (NULL, false, false, false),
+};
+
+static const struct attribute_spec::exclusions attr_target_version_exclusions[] =
+{
+ ATTR_EXCL ("target_clones", true, true, true),
ATTR_EXCL (NULL, false, false, false),
};
@@ -505,6 +515,9 @@ const struct attribute_spec c_common_attribute_table[] =
{ "target", 1, -1, true, false, false, false,
handle_target_attribute,
attr_target_exclusions },
+ { "target_version", 1, 1, true, false, false, false,
+ handle_target_version_attribute,
+ attr_target_version_exclusions },
{ "target_clones", 1, -1, true, false, false, false,
handle_target_clones_attribute,
attr_target_clones_exclusions },
@@ -5670,6 +5683,25 @@ handle_target_attribute (tree *node, tree name, tree args, int flags,
return NULL_TREE;
}
+/* Handle a "target_version" attribute. */
+
+static tree
+handle_target_version_attribute (tree *node, tree name, tree args, int flags,
+ bool *no_add_attrs)
+{
+ /* Ensure we have a function type. */
+ if (TREE_CODE (*node) != FUNCTION_DECL)
+ {
+ warning (OPT_Wattributes, "%qE attribute ignored", name);
+ *no_add_attrs = true;
+ }
+ else if (!targetm.target_option.valid_version_attribute_p (*node, name, args,
+ flags))
+ *no_add_attrs = true;
+
+ return NULL_TREE;
+}
+
/* Handle a "target_clones" attribute. */
static tree
diff --git a/gcc/cgraphclones.cc b/gcc/cgraphclones.cc
index 29d28ef895a73a223695cbb86aafbc845bbe7688..3ba5a4a2dd9fd4b7206d95f01c990818d0440334 100644
--- a/gcc/cgraphclones.cc
+++ b/gcc/cgraphclones.cc
@@ -78,6 +78,7 @@ along with GCC; see the file COPYING3. If not see
#include "tree-eh.h"
#include "tree-cfg.h"
#include "tree-inline.h"
+#include "attribs.h"
#include "dumpfile.h"
#include "gimple-pretty-print.h"
#include "alloc-pool.h"
@@ -1048,7 +1049,17 @@ cgraph_node::create_version_clone_with_body
location_t saved_loc = input_location;
tree v = TREE_VALUE (target_attributes);
input_location = DECL_SOURCE_LOCATION (new_decl);
- bool r = targetm.target_option.valid_attribute_p (new_decl, NULL, v, 1);
+ bool r;
+ tree name_id = get_attribute_name (target_attributes);
+ const char *name_str = IDENTIFIER_POINTER (name_id);
+ if (strcmp (name_str, "target") == 0)
+ r = targetm.target_option.valid_attribute_p (new_decl, name_id, v, 1);
+ else if (strcmp (name_str, "target_version") == 0)
+ r = targetm.target_option.valid_version_attribute_p (new_decl, name_id,
+ v, 1);
+ else
+ gcc_unreachable();
+
input_location = saved_loc;
if (!r)
return NULL;
diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc
index 9e666e5eecee07ae7c742c3a2b27e85899945c4e..e607aa14d284d545d122e04b0eae1247fd301882 100644
--- a/gcc/cp/decl2.cc
+++ b/gcc/cp/decl2.cc
@@ -832,8 +832,8 @@ check_classfn (tree ctype, tree function, tree template_parms)
tree c2 = get_constraints (fndecl);
/* While finding a match, same types and params are not enough
- if the function is versioned. Also check version ("target")
- attributes. */
+ if the function is versioned. Also check for different target
+ specific attributes. */
if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
TREE_TYPE (TREE_TYPE (fndecl)))
&& compparms (p1, p2)
diff --git a/gcc/d/d-attribs.cc b/gcc/d/d-attribs.cc
index c0dc0e24ded871c136e54e5527e901d16cfa5ceb..13911c75948075a838914caca88802ac325f3107 100644
--- a/gcc/d/d-attribs.cc
+++ b/gcc/d/d-attribs.cc
@@ -128,14 +128,16 @@ static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
static const struct attribute_spec::exclusions attr_target_exclusions[] =
{
- ATTR_EXCL ("target_clones", true, true, true),
+ ATTR_EXCL ("target_clones", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
ATTR_EXCL (NULL, false, false, false),
};
static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
{
ATTR_EXCL ("always_inline", true, true, true),
- ATTR_EXCL ("target", true, true, true),
+ ATTR_EXCL ("target", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
ATTR_EXCL (NULL, false, false, false),
};
diff --git a/gcc/defaults.h b/gcc/defaults.h
index dc6f09cacae8a85873c6d6685eea91fb749cc367..6f0959694102ca28fd993aaff7ec3f5d09334c39 100644
--- a/gcc/defaults.h
+++ b/gcc/defaults.h
@@ -877,6 +877,16 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#endif
#endif
+/* Indicate whether the target uses "target" attributes for function
+ multiversioning. This is used to choose between the "target" and
+ "target_version" attributes when expanding a "target_clones" attribute, and
+ determine whether the "target" and "target_clones" attributes are mutually
+ exclusive. */
+#ifndef TARGET_HAS_FMV_TARGET_ATTRIBUTE
+#define TARGET_HAS_FMV_TARGET_ATTRIBUTE 1
+#endif
+
+
/* Select a format to encode pointers in exception handling data. We
prefer those that result in fewer dynamic relocations. Assume no
special support here and encode direct references. */
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index c0f949b538c04b3f409217e0508967dfca131604..1dc1b0523decff48f895703303a72fd93202bf7c 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -10650,6 +10650,18 @@ the function declaration to hold a pointer to a target-specific
@code{struct cl_target_option} structure.
@end deftypefn
+@deftypefn {Target Hook} bool TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P (tree @var{fndecl}, tree @var{name}, tree @var{args}, int @var{flags})
+This hook is called to parse @code{attribute(target_version("..."))},
+which allows setting target-specific options on individual function versions.
+These function-specific options may differ
+from the options specified on the command line. The hook should return
+@code{true} if the options are valid.
+
+The hook should set the @code{DECL_FUNCTION_SPECIFIC_TARGET} field in
+the function declaration to hold a pointer to a target-specific
+@code{struct cl_target_option} structure.
+@end deftypefn
+
@deftypefn {Target Hook} void TARGET_OPTION_SAVE (struct cl_target_option *@var{ptr}, struct gcc_options *@var{opts}, struct gcc_options *@var{opts_set})
This hook is called to save any additional target-specific information
in the @code{struct cl_target_option} structure for function-specific
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index ef04c89d7b6fd27332f09ba844c11d4bbcf3bbe0..c452108ad54a7828762f17a864f700d1682a3964 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -7031,6 +7031,8 @@ on this implementation detail.
@hook TARGET_OPTION_VALID_ATTRIBUTE_P
+@hook TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P
+
@hook TARGET_OPTION_SAVE
@hook TARGET_OPTION_RESTORE
diff --git a/gcc/multiple_target.cc b/gcc/multiple_target.cc
index a2ed048d7dd28ec470953fcd8a0dc86817e4b7dc..a832d1e8ff83d99acd7579c276b083141102f3e1 100644
--- a/gcc/multiple_target.cc
+++ b/gcc/multiple_target.cc
@@ -66,10 +66,6 @@ create_dispatcher_calls (struct cgraph_node *node)
{
ipa_ref *ref;
- if (!DECL_FUNCTION_VERSIONED (node->decl)
- || !is_function_default_version (node->decl))
- return;
-
if (!targetm.has_ifunc_p ())
{
error_at (DECL_SOURCE_LOCATION (node->decl),
@@ -377,6 +373,8 @@ expand_target_clones (struct cgraph_node *node, bool definition)
return false;
}
+ const char *new_attr_name = (TARGET_HAS_FMV_TARGET_ATTRIBUTE
+ ? "target" : "target_version");
cgraph_function_version_info *decl1_v = NULL;
cgraph_function_version_info *decl2_v = NULL;
cgraph_function_version_info *before = NULL;
@@ -392,7 +390,7 @@ expand_target_clones (struct cgraph_node *node, bool definition)
char *attr = attrs[i];
/* Create new target clone. */
- tree attributes = make_attribute ("target", attr,
+ tree attributes = make_attribute (new_attr_name, attr,
DECL_ATTRIBUTES (node->decl));
char *suffix = XNEWVEC (char, strlen (attr) + 1);
@@ -430,7 +428,7 @@ expand_target_clones (struct cgraph_node *node, bool definition)
XDELETEVEC (attr_str);
/* Setting new attribute to initial function. */
- tree attributes = make_attribute ("target", "default",
+ tree attributes = make_attribute (new_attr_name, "default",
DECL_ATTRIBUTES (node->decl));
DECL_ATTRIBUTES (node->decl) = attributes;
node->local = false;
diff --git a/gcc/target.def b/gcc/target.def
index eae7959cdccbfe669d234afe45c39545eae64234..ccdd3c56f5a9d74a14899ba60ac5c41de6bc192d 100644
--- a/gcc/target.def
+++ b/gcc/target.def
@@ -6540,6 +6540,23 @@ the function declaration to hold a pointer to a target-specific\n\
bool, (tree fndecl, tree name, tree args, int flags),
default_target_option_valid_attribute_p)
+/* Function to validate the attribute((target_version(...))) strings. If
+ the option is validated, the hook should also fill in
+ DECL_FUNCTION_SPECIFIC_TARGET in the function decl node. */
+DEFHOOK
+(valid_version_attribute_p,
+ "This hook is called to parse @code{attribute(target_version(\"...\"))},\n\
+which allows setting target-specific options on individual function versions.\n\
+These function-specific options may differ\n\
+from the options specified on the command line. The hook should return\n\
+@code{true} if the options are valid.\n\
+\n\
+The hook should set the @code{DECL_FUNCTION_SPECIFIC_TARGET} field in\n\
+the function declaration to hold a pointer to a target-specific\n\
+@code{struct cl_target_option} structure.",
+ bool, (tree fndecl, tree name, tree args, int flags),
+ default_target_option_valid_version_attribute_p)
+
/* Function to save any extra target state in the target options structure. */
DEFHOOK
(save,
diff --git a/gcc/targhooks.h b/gcc/targhooks.h
index 26695abe41e46d4d73402734c15892cfef6cf829..9e76326166c39a381ef3c9fbb9300d1523d9bb47 100644
--- a/gcc/targhooks.h
+++ b/gcc/targhooks.h
@@ -192,6 +192,7 @@ extern bool default_hard_regno_scratch_ok (unsigned int);
extern bool default_mode_dependent_address_p (const_rtx, addr_space_t);
extern bool default_new_address_profitable_p (rtx, rtx_insn *, rtx);
extern bool default_target_option_valid_attribute_p (tree, tree, tree, int);
+extern bool default_target_option_valid_version_attribute_p (tree, tree, tree, int);
extern bool default_target_option_pragma_parse (tree, tree);
extern bool default_target_can_inline_p (tree, tree);
extern bool default_update_ipa_fn_target_info (unsigned int &, const gimple *);
diff --git a/gcc/targhooks.cc b/gcc/targhooks.cc
index a2dc7331c24d100405434ec670678fcacadaee9b..aabba67787fbe91ae5f5dc50d7c2a29c410944a7 100644
--- a/gcc/targhooks.cc
+++ b/gcc/targhooks.cc
@@ -1789,7 +1789,19 @@ default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
int ARG_UNUSED (flags))
{
warning (OPT_Wattributes,
- "target attribute is not supported on this machine");
+ "%<target%> attribute is not supported on this machine");
+
+ return false;
+}
+
+bool
+default_target_option_valid_version_attribute_p (tree ARG_UNUSED (fndecl),
+ tree ARG_UNUSED (name),
+ tree ARG_UNUSED (args),
+ int ARG_UNUSED (flags))
+{
+ warning (OPT_Wattributes,
+ "%<target_version%> attribute is not supported on this machine");
return false;
}
diff --git a/gcc/tree.h b/gcc/tree.h
index 086b55f0375435d53a1604b6659da4f19fce3d17..d7841af19b20b0dc0ae28b433d5150e9c4763eff 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -3500,8 +3500,8 @@ extern vec<tree, va_gc> **decl_debug_args_insert (tree);
(FUNCTION_DECL_CHECK (NODE)->function_decl.function_specific_optimization)
/* In FUNCTION_DECL, this is set if this function has other versions generated
- using "target" attributes. The default version is the one which does not
- have any "target" attribute set. */
+ to support different architecture feature sets, e.g. using "target" or
+ "target_version" attributes. */
#define DECL_FUNCTION_VERSIONED(NODE)\
(FUNCTION_DECL_CHECK (NODE)->function_decl.versioned_function)
^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH v3 5/5] aarch64: Add function multiversioning support
2023-12-06 12:43 [PATCH v3 0/5] target_version and aarch64 function multiversioning Andrew Carlotti
` (3 preceding siblings ...)
2023-12-06 12:46 ` [PATCH v3 4/5] Add support for target_version attribute Andrew Carlotti
@ 2023-12-06 12:47 ` Andrew Carlotti
2023-12-14 14:02 ` Richard Sandiford
4 siblings, 1 reply; 11+ messages in thread
From: Andrew Carlotti @ 2023-12-06 12:47 UTC (permalink / raw)
To: gcc-patches; +Cc: Richard Biener, Richard Sandiford
This adds initial support for function multiversioning on aarch64 using
the target_version and target_clones attributes. This loosely follows
the Beta specification in the ACLE [1], although with some differences
that still need to be resolved (possibly as follow-up patches).
Existing function multiversioning implementations are broken in various
ways when used across translation units. This includes placing
resolvers in the wrong translation units, and using symbol mangling that
callers to unintentionally bypass the resolver in some circumstances.
Fixing these issues for aarch64 will require modifications to our ACLE
specification. It will also require further adjustments to existing
middle end code, to facilitate different mangling and resolver
placement while preserving existing target behaviours.
The list of function multiversioning features specified in the ACLE is
also inconsistent with the list of features supported in target option
extensions. I intend to resolve some or all of these inconsistencies at
a later stage.
The target_version attribute is currently only supported in C++, since
this is the only frontend with existing support for multiversioning
using the target attribute. On the other hand, this patch happens to
enable multiversioning with the target_clones attribute in Ada and D, as
well as the entire C family, using their existing frontend support.
This patch also does not support the following aspects of the Beta
specification:
- The target_clones attribute should allow an implicit unlisted
"default" version.
- There should be an option to disable function multiversioning at
compile time.
- Unrecognised target names in a target_clones attribute should be
ignored (with an optional warning). This current patch raises an
error instead.
[1] https://github.com/ARM-software/acle/blob/main/main/acle.md#function-multi-versioning
---
I believe the support present in this patch correctly handles function
multiversioning within a single translation unit for all features in the ACLE
specification with option extension support.
Is it ok to push this patch in its current state? I'd then continue working on
incremental improvements to the supported feature extensions and the ABI issues
in followup patches, along with corresponding changes and improvements to the
ACLE specification.
gcc/ChangeLog:
* config/aarch64/aarch64-feature-deps.h (fmv_deps_<FEAT_NAME>):
Define aarch64_feature_flags mask foreach FMV feature.
* config/aarch64/aarch64-option-extensions.def: Use new macros
to define FMV feature extensions.
* config/aarch64/aarch64.cc (aarch64_option_valid_attribute_p):
Check for target_version attribute after processing target
attribute.
(aarch64_fmv_feature_data): New.
(aarch64_parse_fmv_features): New.
(aarch64_process_target_version_attr): New.
(aarch64_option_valid_version_attribute_p): New.
(get_feature_mask_for_version): New.
(compare_feature_masks): New.
(aarch64_compare_version_priority): New.
(build_ifunc_arg_type): New.
(make_resolver_func): New.
(add_condition_to_bb): New.
(dispatch_function_versions): New.
(aarch64_generate_version_dispatcher_body): New.
(aarch64_get_function_versions_dispatcher): New.
(aarch64_common_function_versions): New.
(aarch64_mangle_decl_assembler_name): New.
(TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P): New implementation.
(TARGET_OPTION_EXPANDED_CLONES_ATTRIBUTE): New implementation.
(TARGET_OPTION_FUNCTION_VERSIONS): New implementation.
(TARGET_COMPARE_VERSION_PRIORITY): New implementation.
(TARGET_GENERATE_VERSION_DISPATCHER_BODY): New implementation.
(TARGET_GET_FUNCTION_VERSIONS_DISPATCHER): New implementation.
(TARGET_MANGLE_DECL_ASSEMBLER_NAME): New implementation.
* config/aarch64/aarch64.h (TARGET_HAS_FMV_TARGET_ATTRIBUTE):
Set target macro.
* config/arm/aarch-common.h (enum aarch_parse_opt_result): Add
new value to report duplicate FMV feature.
* common/config/aarch64/cpuinfo.h: New file.
libgcc/ChangeLog:
* config/aarch64/cpuinfo.c (enum CPUFeatures): Move to shared
copy in gcc/common
gcc/testsuite/ChangeLog:
* gcc.target/aarch64/options_set_17.c: Reorder expected flags.
* gcc.target/aarch64/cpunative/native_cpu_0.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_13.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_16.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_17.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_18.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_19.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_20.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_21.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_22.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_6.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_7.c: Ditto.
diff --git a/gcc/common/config/aarch64/cpuinfo.h b/gcc/common/config/aarch64/cpuinfo.h
new file mode 100644
index 0000000000000000000000000000000000000000..1690b6eee48e960d0ae675f8e8b05e6f182b56a3
--- /dev/null
+++ b/gcc/common/config/aarch64/cpuinfo.h
@@ -0,0 +1,94 @@
+/* CPU feature detection for AArch64 architecture.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+
+ This file is part of GCC.
+
+ This file is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 3, or (at your option) any
+ later version.
+
+ This file is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ Under Section 7 of GPL version 3, you are granted additional
+ permissions described in the GCC Runtime Library Exception, version
+ 3.1, as published by the Free Software Foundation.
+
+ You should have received a copy of the GNU General Public License and
+ a copy of the GCC Runtime Library Exception along with this program;
+ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* This enum is used in libgcc feature detection, and in the function
+ multiversioning implementation in aarch64.cc. The enum should use the same
+ values as the corresponding enum in LLVM's compiler-rt, to faciliate
+ compatibility between compilers. */
+
+enum CPUFeatures {
+ FEAT_RNG,
+ FEAT_FLAGM,
+ FEAT_FLAGM2,
+ FEAT_FP16FML,
+ FEAT_DOTPROD,
+ FEAT_SM4,
+ FEAT_RDM,
+ FEAT_LSE,
+ FEAT_FP,
+ FEAT_SIMD,
+ FEAT_CRC,
+ FEAT_SHA1,
+ FEAT_SHA2,
+ FEAT_SHA3,
+ FEAT_AES,
+ FEAT_PMULL,
+ FEAT_FP16,
+ FEAT_DIT,
+ FEAT_DPB,
+ FEAT_DPB2,
+ FEAT_JSCVT,
+ FEAT_FCMA,
+ FEAT_RCPC,
+ FEAT_RCPC2,
+ FEAT_FRINTTS,
+ FEAT_DGH,
+ FEAT_I8MM,
+ FEAT_BF16,
+ FEAT_EBF16,
+ FEAT_RPRES,
+ FEAT_SVE,
+ FEAT_SVE_BF16,
+ FEAT_SVE_EBF16,
+ FEAT_SVE_I8MM,
+ FEAT_SVE_F32MM,
+ FEAT_SVE_F64MM,
+ FEAT_SVE2,
+ FEAT_SVE_AES,
+ FEAT_SVE_PMULL128,
+ FEAT_SVE_BITPERM,
+ FEAT_SVE_SHA3,
+ FEAT_SVE_SM4,
+ FEAT_SME,
+ FEAT_MEMTAG,
+ FEAT_MEMTAG2,
+ FEAT_MEMTAG3,
+ FEAT_SB,
+ FEAT_PREDRES,
+ FEAT_SSBS,
+ FEAT_SSBS2,
+ FEAT_BTI,
+ FEAT_LS64,
+ FEAT_LS64_V,
+ FEAT_LS64_ACCDATA,
+ FEAT_WFXT,
+ FEAT_SME_F64,
+ FEAT_SME_I64,
+ FEAT_SME2,
+ FEAT_RCPC3,
+ FEAT_MAX,
+ FEAT_EXT = 62, /* Reserved to indicate presence of additional features field
+ in __aarch64_cpu_features. */
+ FEAT_INIT /* Used as flag of features initialization completion. */
+};
diff --git a/gcc/config/aarch64/aarch64-feature-deps.h b/gcc/config/aarch64/aarch64-feature-deps.h
index 7b85a8860de57f6727644c03296cef192ad0990c..8f20582e1efdd4817138480bee8cdb27fa7f3dfe 100644
--- a/gcc/config/aarch64/aarch64-feature-deps.h
+++ b/gcc/config/aarch64/aarch64-feature-deps.h
@@ -115,6 +115,13 @@ get_flags_off (aarch64_feature_flags mask)
constexpr auto cpu_##CORE_IDENT = ARCH_IDENT ().enable | get_enable FEATURES;
#include "config/aarch64/aarch64-cores.def"
+/* Define fmv_deps_<NAME> variables for each FMV feature, giving the transitive
+ closure of all the features that the FMV feature enables. */
+#define AARCH64_FMV_FEATURE(A, FEAT_NAME, OPT_FLAGS) \
+ constexpr auto fmv_deps_##FEAT_NAME = get_enable OPT_FLAGS;
+#include "config/aarch64/aarch64-option-extensions.def"
+
+
}
}
diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index 825f3bf775899e2e5cffb1867b82766d632c8708..29f542a183380b61a26b302816584d3c0990be55 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -17,17 +17,22 @@
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
-/* This is a list of ISA extentsions in AArch64.
+/* This is a list of ISA extensions in AArch64.
- Before using #include to read this file, define a macro:
+ Before using #include to read this file, define one of the following
+ macros:
AARCH64_OPT_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON,
EXPLICIT_OFF, FEATURE_STRING)
+ AARCH64_FMV_FEATURE(NAME, FEAT_NAME, IDENT)
+
- NAME is the name of the extension, represented as a string constant.
- IDENT is the canonical internal name for this flag.
+ - FEAT_NAME is the unprefixed name used in the CPUFeatures enum.
+
- REQUIRES is a list of features that must be enabled whenever this
feature is enabled. The relationship is implicitly transitive:
if A appears in B's REQUIRES and B appears in C's REQUIRES then
@@ -58,45 +63,96 @@
that are required. Their order is not important. An empty string means
do not detect this feature during auto detection.
- The list of features must follow topological order wrt REQUIRES
- and EXPLICIT_ON. For example, if A is in B's REQUIRES list, A must
- come before B. This is enforced by aarch64-feature-deps.h.
+ - OPT_FLAGS is a list of feature IDENTS that should be enabled (along with
+ their transitive dependencies) when the specified FMV feature is present.
+
+ Where a feature is present as both an extension and a function
+ multiversioning feature, and IDENT matches the FEAT_NAME suffix, then these
+ can be listed here simultaneously using the macro:
+
+ AARCH64_OPT_FMV_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON,
+ EXPLICIT_OFF, FEATURE_STRING)
+
+ The list of features extensions must follow topological order wrt REQUIRES
+ and EXPLICIT_ON. For example, if A is in B's REQUIRES list, A must come
+ before B. This is enforced by aarch64-feature-deps.h.
+
+ The list of multiversioning features must be ordered by increasing priority,
+ as defined in https://github.com/ARM-software/acle/blob/main/main/acle.md
NOTE: Any changes to the AARCH64_OPT_EXTENSION macro need to be mirrored in
config.gcc. */
+#ifndef AARCH64_OPT_EXTENSION
+#define AARCH64_OPT_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON, \
+ EXPLICIT_OFF, FEATURE_STRING)
+#endif
+
+#ifndef AARCH64_FMV_FEATURE
+#define AARCH64_FMV_FEATURE(NAME, FEAT_NAME, OPT_FLAGS)
+#endif
+
+#define AARCH64_OPT_FMV_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON, \
+ EXPLICIT_OFF, FEATURE_STRING) \
+AARCH64_OPT_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON, EXPLICIT_OFF, \
+ FEATURE_STRING) \
+AARCH64_FMV_FEATURE(NAME, IDENT, (IDENT))
+
+
AARCH64_OPT_EXTENSION("fp", FP, (), (), (), "fp")
AARCH64_OPT_EXTENSION("simd", SIMD, (FP), (), (), "asimd")
-AARCH64_OPT_EXTENSION("crc", CRC, (), (), (), "crc32")
+AARCH64_OPT_FMV_EXTENSION("rng", RNG, (), (), (), "rng")
-AARCH64_OPT_EXTENSION("lse", LSE, (), (), (), "atomics")
+AARCH64_OPT_FMV_EXTENSION("flagm", FLAGM, (), (), (), "flagm")
-/* +nofp16 disables an implicit F16FML, even though an implicit F16FML
- does not imply F16. See F16FML for more details. */
-AARCH64_OPT_EXTENSION("fp16", F16, (FP), (), (F16FML), "fphp asimdhp")
+AARCH64_FMV_FEATURE("flagm2", FLAGM2, (FLAGM))
+
+AARCH64_FMV_FEATURE("fp16fml", FP16FML, (F16FML))
+
+AARCH64_OPT_FMV_EXTENSION("dotprod", DOTPROD, (SIMD), (), (), "asimddp")
-AARCH64_OPT_EXTENSION("rcpc", RCPC, (), (), (), "lrcpc")
+AARCH64_OPT_FMV_EXTENSION("sm4", SM4, (SIMD), (), (), "sm3 sm4")
/* An explicit +rdma implies +simd, but +rdma+nosimd still enables scalar
RDMA instructions. */
AARCH64_OPT_EXTENSION("rdma", RDMA, (), (SIMD), (), "asimdrdm")
-AARCH64_OPT_EXTENSION("dotprod", DOTPROD, (SIMD), (), (), "asimddp")
+AARCH64_FMV_FEATURE("rmd", RDM, (RDMA))
+
+AARCH64_OPT_FMV_EXTENSION("lse", LSE, (), (), (), "atomics")
+
+AARCH64_FMV_FEATURE("fp", FP, (FP))
+
+AARCH64_FMV_FEATURE("simd", SIMD, (SIMD))
+
+AARCH64_OPT_FMV_EXTENSION("crc", CRC, (), (), (), "crc32")
-AARCH64_OPT_EXTENSION("aes", AES, (SIMD), (), (), "aes")
+AARCH64_FMV_FEATURE("sha1", SHA1, ())
-AARCH64_OPT_EXTENSION("sha2", SHA2, (SIMD), (), (), "sha1 sha2")
+AARCH64_OPT_FMV_EXTENSION("sha2", SHA2, (SIMD), (), (), "sha1 sha2")
+
+AARCH64_FMV_FEATURE("sha3", SHA3, (SHA3))
+
+AARCH64_OPT_FMV_EXTENSION("aes", AES, (SIMD), (), (), "aes")
+
+AARCH64_FMV_FEATURE("pmull", PMULL, ())
/* +nocrypto disables AES, SHA2 and SM4, and anything that depends on them
(such as SHA3 and the SVE2 crypto extensions). */
AARCH64_OPT_EXTENSION("crypto", CRYPTO, (AES, SHA2), (), (AES, SHA2, SM4),
"aes pmull sha1 sha2")
+/* Listing sha3 after crypto means we pass "+aes+sha3" to the assembler
+ instead of "+sha3+crypto". */
AARCH64_OPT_EXTENSION("sha3", SHA3, (SHA2), (), (), "sha3 sha512")
-AARCH64_OPT_EXTENSION("sm4", SM4, (SIMD), (), (), "sm3 sm4")
+/* +nofp16 disables an implicit F16FML, even though an implicit F16FML
+ does not imply F16. See F16FML for more details. */
+AARCH64_OPT_EXTENSION("fp16", F16, (FP), (), (F16FML), "fphp asimdhp")
+
+AARCH64_FMV_FEATURE("fp16", FP16, (F16))
/* An explicit +fp16fml implies +fp16, but a dependence on it does not.
Thus -march=armv8.4-a implies F16FML but not F16. -march=armv8.4-a+fp16
@@ -104,51 +160,117 @@ AARCH64_OPT_EXTENSION("sm4", SM4, (SIMD), (), (), "sm3 sm4")
-march=armv8.4-a+nofp16+fp16 enables F16 but not F16FML. */
AARCH64_OPT_EXTENSION("fp16fml", F16FML, (), (F16), (), "asimdfhm")
-AARCH64_OPT_EXTENSION("sve", SVE, (SIMD, F16), (), (), "sve")
+AARCH64_FMV_FEATURE("dit", DIT, ())
-AARCH64_OPT_EXTENSION("profile", PROFILE, (), (), (), "")
+AARCH64_FMV_FEATURE("dpb", DPB, ())
-AARCH64_OPT_EXTENSION("rng", RNG, (), (), (), "rng")
+AARCH64_FMV_FEATURE("dpb2", DPB2, ())
-AARCH64_OPT_EXTENSION("memtag", MEMTAG, (), (), (), "")
+AARCH64_FMV_FEATURE("jscvt", JSCVT, ())
-AARCH64_OPT_EXTENSION("sb", SB, (), (), (), "sb")
+AARCH64_FMV_FEATURE("fcma", FCMA, (SIMD))
-AARCH64_OPT_EXTENSION("ssbs", SSBS, (), (), (), "ssbs")
+AARCH64_OPT_FMV_EXTENSION("rcpc", RCPC, (), (), (), "lrcpc")
-AARCH64_OPT_EXTENSION("predres", PREDRES, (), (), (), "")
+AARCH64_FMV_FEATURE("rcpc2", RCPC2, (RCPC))
-AARCH64_OPT_EXTENSION("sve2", SVE2, (SVE), (), (), "sve2")
+AARCH64_FMV_FEATURE("rcpc3", RCPC3, (RCPC))
-AARCH64_OPT_EXTENSION("sve2-sm4", SVE2_SM4, (SVE2, SM4), (), (), "svesm4")
+AARCH64_FMV_FEATURE("frintts", FRINTTS, ())
+
+AARCH64_FMV_FEATURE("dgh", DGH, ())
+
+AARCH64_OPT_FMV_EXTENSION("i8mm", I8MM, (SIMD), (), (), "i8mm")
+
+/* An explicit +bf16 implies +simd, but +bf16+nosimd still enables scalar BF16
+ instructions. */
+AARCH64_OPT_FMV_EXTENSION("bf16", BF16, (FP), (SIMD), (), "bf16")
+
+AARCH64_FMV_FEATURE("ebf16", EBF16, (BF16))
+
+AARCH64_FMV_FEATURE("rpres", RPRES, ())
+
+AARCH64_OPT_FMV_EXTENSION("sve", SVE, (SIMD, F16), (), (), "sve")
+
+AARCH64_FMV_FEATURE("sve-bf16", SVE_BF16, (SVE, BF16))
+
+AARCH64_FMV_FEATURE("sve-ebf16", SVE_EBF16, (SVE, BF16))
+
+AARCH64_FMV_FEATURE("sve-i8mm", SVE_I8MM, (SVE, I8MM))
+
+AARCH64_OPT_EXTENSION("f32mm", F32MM, (SVE), (), (), "f32mm")
+
+AARCH64_FMV_FEATURE("f32mm", SVE_F32MM, (F32MM))
+
+AARCH64_OPT_EXTENSION("f64mm", F64MM, (SVE), (), (), "f64mm")
+
+AARCH64_FMV_FEATURE("f64mm", SVE_F64MM, (F64MM))
+
+AARCH64_OPT_FMV_EXTENSION("sve2", SVE2, (SVE), (), (), "sve2")
AARCH64_OPT_EXTENSION("sve2-aes", SVE2_AES, (SVE2, AES), (), (), "sveaes")
-AARCH64_OPT_EXTENSION("sve2-sha3", SVE2_SHA3, (SVE2, SHA3), (), (), "svesha3")
+AARCH64_FMV_FEATURE("sve2-aes", SVE_AES, (SVE2_AES))
+
+AARCH64_FMV_FEATURE("sve2-pmull128", SVE_PMULL128, (SVE2))
AARCH64_OPT_EXTENSION("sve2-bitperm", SVE2_BITPERM, (SVE2), (), (),
"svebitperm")
-AARCH64_OPT_EXTENSION("tme", TME, (), (), (), "")
+AARCH64_FMV_FEATURE("sve2-bitperm", SVE_BITPERM, (SVE2_BITPERM))
-AARCH64_OPT_EXTENSION("i8mm", I8MM, (SIMD), (), (), "i8mm")
+AARCH64_OPT_EXTENSION("sve2-sha3", SVE2_SHA3, (SVE2, SHA3), (), (), "svesha3")
-AARCH64_OPT_EXTENSION("f32mm", F32MM, (SVE), (), (), "f32mm")
+AARCH64_FMV_FEATURE("sve2-sha3", SVE_SHA3, (SVE2_SHA3))
-AARCH64_OPT_EXTENSION("f64mm", F64MM, (SVE), (), (), "f64mm")
+AARCH64_OPT_EXTENSION("sve2-sm4", SVE2_SM4, (SVE2, SM4), (), (), "svesm4")
-/* An explicit +bf16 implies +simd, but +bf16+nosimd still enables scalar BF16
- instructions. */
-AARCH64_OPT_EXTENSION("bf16", BF16, (FP), (SIMD), (), "bf16")
+AARCH64_FMV_FEATURE("sve2-sm4", SVE_SM4, (SVE2_SM4))
+
+AARCH64_FMV_FEATURE("sme", SME, ())
-AARCH64_OPT_EXTENSION("flagm", FLAGM, (), (), (), "flagm")
+AARCH64_OPT_FMV_EXTENSION("memtag", MEMTAG, (), (), (), "")
+
+AARCH64_FMV_FEATURE("memtag2", MEMTAG2, (MEMTAG))
+
+AARCH64_FMV_FEATURE("memtag3", MEMTAG3, (MEMTAG))
+
+AARCH64_OPT_FMV_EXTENSION("sb", SB, (), (), (), "sb")
+
+AARCH64_OPT_FMV_EXTENSION("predres", PREDRES, (), (), (), "")
+
+AARCH64_OPT_FMV_EXTENSION("ssbs", SSBS, (), (), (), "ssbs")
+
+AARCH64_FMV_FEATURE("ssbs2", SSBS2, (SSBS))
+
+AARCH64_FMV_FEATURE("bti", BTI, ())
+
+AARCH64_OPT_EXTENSION("profile", PROFILE, (), (), (), "")
+
+AARCH64_OPT_EXTENSION("tme", TME, (), (), (), "")
AARCH64_OPT_EXTENSION("pauth", PAUTH, (), (), (), "paca pacg")
AARCH64_OPT_EXTENSION("ls64", LS64, (), (), (), "")
+AARCH64_FMV_FEATURE("ls64", LS64, ())
+
+AARCH64_FMV_FEATURE("ls64_v", LS64_V, ())
+
+AARCH64_FMV_FEATURE("ls64_accdata", LS64_ACCDATA, (LS64))
+
+AARCH64_FMV_FEATURE("wfxt", WFXT, ())
+
+AARCH64_FMV_FEATURE("sme-f64f64", SME_F64, ())
+
+AARCH64_FMV_FEATURE("sme-i64i64", SME_I64, ())
+
+AARCH64_FMV_FEATURE("sme2", SME2, ())
+
AARCH64_OPT_EXTENSION("mops", MOPS, (), (), (), "")
AARCH64_OPT_EXTENSION("cssc", CSSC, (), (), (), "cssc")
+#undef AARCH64_OPT_FMV_EXTENSION
#undef AARCH64_OPT_EXTENSION
+#undef AARCH64_FMV_FEATURE
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index d3613a0a42b7b6d2c4452739841b133014909a39..ea49ef6cfa6df35465a111f120cf0db19da8e5e6 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -1181,6 +1181,8 @@ extern enum aarch64_code_model aarch64_cmodel;
(aarch64_cmodel == AARCH64_CMODEL_TINY \
|| aarch64_cmodel == AARCH64_CMODEL_TINY_PIC)
+#define TARGET_HAS_FMV_TARGET_ATTRIBUTE 0
+
#define TARGET_SUPPORTS_WIDE_INT 1
/* Modes valid for AdvSIMD D registers, i.e. that fit in half a Q register. */
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index f6f6f94bf431e59f90fceb94483b29cb755c7fda..431fd81b03ba7f1d59d1ece13e327b2d74881a90 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -84,6 +84,7 @@
#include "aarch64-feature-deps.h"
#include "config/arm/aarch-common.h"
#include "config/arm/aarch-common-protos.h"
+#include "common/config/aarch64/cpuinfo.h"
#include "ssa.h"
/* This file should be included last. */
@@ -17163,6 +17164,8 @@ aarch64_process_target_attr (tree args)
return true;
}
+static bool aarch64_process_target_version_attr (tree args);
+
/* Implement TARGET_OPTION_VALID_ATTRIBUTE_P. This is used to
process attribute ((target ("..."))). */
@@ -17218,6 +17221,19 @@ aarch64_option_valid_attribute_p (tree fndecl, tree, tree args, int)
TREE_TARGET_OPTION (target_option_current_node));
ret = aarch64_process_target_attr (args);
+ if (ret)
+ {
+ tree version_attr = lookup_attribute ("target_version",
+ DECL_ATTRIBUTES (fndecl));
+ if (version_attr != NULL_TREE)
+ {
+ /* Reapply any target_version attribute after target attribute.
+ This should be equivalent to applying the target_version once
+ after processing all target attributes. */
+ tree version_args = TREE_VALUE (version_attr);
+ ret = aarch64_process_target_version_attr (version_args);
+ }
+ }
/* Set up any additional state. */
if (ret)
@@ -17248,6 +17264,831 @@ aarch64_option_valid_attribute_p (tree fndecl, tree, tree args, int)
return ret;
}
+typedef unsigned long long aarch64_fmv_feature_mask;
+
+typedef struct
+{
+ const char *name;
+ aarch64_fmv_feature_mask feature_mask;
+ aarch64_feature_flags opt_flags;
+} aarch64_fmv_feature_datum;
+
+#define AARCH64_FMV_FEATURE(NAME, FEAT_NAME, C) \
+ {NAME, 1ULL << FEAT_##FEAT_NAME, ::feature_deps::fmv_deps_##FEAT_NAME},
+
+/* FMV features are listed in priority order, to make it easier to sort target
+ strings. */
+static aarch64_fmv_feature_datum aarch64_fmv_feature_data[] = {
+#include "config/aarch64/aarch64-option-extensions.def"
+};
+
+/* Parse a function multiversioning feature string STR, as found in a
+ target_version or target_clones attribute.
+
+ If ISA_FLAGS is nonnull, then update it with the specified architecture
+ features turned on. If FEATURE_MASK is nonnull, then assign to it a bitmask
+ representing the set of features explicitly specified in the feature string.
+ Return an aarch_parse_opt_result describing the result.
+
+ When the STR string contains an invalid or duplicate extension, a copy of
+ the extension string is created and stored to INVALID_EXTENSION. */
+
+static enum aarch_parse_opt_result
+aarch64_parse_fmv_features (const char *str, aarch64_feature_flags *isa_flags,
+ aarch64_fmv_feature_mask *feature_mask,
+ std::string *invalid_extension)
+{
+ if (feature_mask)
+ *feature_mask = 0ULL;
+
+ if (strcmp (str, "default") == 0)
+ return AARCH_PARSE_OK;
+
+ while (str != NULL && *str != 0)
+ {
+ const char *ext;
+ size_t len;
+
+ ext = strchr (str, '+');
+
+ if (ext != NULL)
+ len = ext - str;
+ else
+ len = strlen (str);
+
+ if (len == 0)
+ return AARCH_PARSE_MISSING_ARG;
+
+ static const int num_features = ARRAY_SIZE (aarch64_fmv_feature_data);
+ int i;
+ for (i = 0; i < num_features; i++)
+ {
+ if (strlen (aarch64_fmv_feature_data[i].name) == len
+ && strncmp (aarch64_fmv_feature_data[i].name, str, len) == 0)
+ {
+ if (isa_flags)
+ *isa_flags |= aarch64_fmv_feature_data[i].opt_flags;
+ if (feature_mask)
+ {
+ auto old_feature_mask = *feature_mask;
+ *feature_mask |= aarch64_fmv_feature_data[i].feature_mask;
+ if (*feature_mask == old_feature_mask)
+ {
+ /* Duplicate feature. */
+ if (invalid_extension)
+ *invalid_extension = std::string (str, len);
+ return AARCH_PARSE_DUPLICATE_FEATURE;
+ }
+ }
+ break;
+ }
+ }
+
+ if (i == num_features)
+ {
+ /* Feature not found in list. */
+ if (invalid_extension)
+ *invalid_extension = std::string (str, len);
+ return AARCH_PARSE_INVALID_FEATURE;
+ }
+
+ str = ext;
+ if (str)
+ /* Skip over the next '+'. */
+ str++;
+ }
+
+ return AARCH_PARSE_OK;
+}
+
+/* Parse the tree in ARGS that contains the target_version attribute
+ information and update the global target options space. */
+
+static bool
+aarch64_process_target_version_attr (tree args)
+{
+ if (TREE_CODE (args) == TREE_LIST)
+ {
+ if (TREE_CHAIN (args))
+ {
+ error ("attribute %<target_version%> has multiple values");
+ return false;
+ }
+ args = TREE_VALUE (args);
+ }
+
+ if (!args || TREE_CODE (args) != STRING_CST)
+ {
+ error ("attribute %<target_version%> argument not a string");
+ return false;
+ }
+
+ const char *str = TREE_STRING_POINTER (args);
+
+ enum aarch_parse_opt_result parse_res;
+ auto isa_flags = aarch64_asm_isa_flags;
+
+ std::string invalid_extension;
+ parse_res = aarch64_parse_fmv_features (str, &isa_flags, NULL,
+ &invalid_extension);
+
+ if (parse_res == AARCH_PARSE_OK)
+ {
+ aarch64_set_asm_isa_flags (isa_flags);
+ return true;
+ }
+
+ switch (parse_res)
+ {
+ case AARCH_PARSE_MISSING_ARG:
+ error ("missing value in %<target_version%> attribute");
+ break;
+
+ case AARCH_PARSE_INVALID_FEATURE:
+ error ("invalid feature modifier %qs of value %qs in "
+ "%<target_version%> attribute", invalid_extension.c_str (),
+ str);
+ break;
+
+ case AARCH_PARSE_DUPLICATE_FEATURE:
+ error ("duplicate feature modifier %qs of value %qs in "
+ "%<target_version%> attribute", invalid_extension.c_str (),
+ str);
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+
+ return false;
+}
+
+/* Implement TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P. This is used to
+ process attribute ((target_version ("..."))). */
+
+static bool
+aarch64_option_valid_version_attribute_p (tree fndecl, tree, tree args, int)
+{
+ struct cl_target_option cur_target;
+ bool ret;
+ tree new_target;
+ tree existing_target = DECL_FUNCTION_SPECIFIC_TARGET (fndecl);
+
+ /* Save the current target options to restore at the end. */
+ cl_target_option_save (&cur_target, &global_options, &global_options_set);
+
+ /* If fndecl already has some target attributes applied to it, unpack
+ them so that we add this attribute on top of them, rather than
+ overwriting them. */
+ if (existing_target)
+ {
+ struct cl_target_option *existing_options
+ = TREE_TARGET_OPTION (existing_target);
+
+ if (existing_options)
+ cl_target_option_restore (&global_options, &global_options_set,
+ existing_options);
+ }
+ else
+ cl_target_option_restore (&global_options, &global_options_set,
+ TREE_TARGET_OPTION (target_option_current_node));
+
+ ret = aarch64_process_target_version_attr (args);
+
+ /* Set up any additional state. */
+ if (ret)
+ {
+ aarch64_override_options_internal (&global_options);
+ new_target = build_target_option_node (&global_options,
+ &global_options_set);
+ }
+ else
+ new_target = NULL;
+
+ if (fndecl && ret)
+ {
+ DECL_FUNCTION_SPECIFIC_TARGET (fndecl) = new_target;
+ }
+
+ cl_target_option_restore (&global_options, &global_options_set, &cur_target);
+
+ return ret;
+}
+
+/* This parses the attribute arguments to target_version in DECL and the
+ feature mask required to select those targets. No adjustments are made to
+ add or remove redundant feature requirements. */
+
+static aarch64_fmv_feature_mask
+get_feature_mask_for_version (tree decl)
+{
+ tree version_attr = lookup_attribute ("target_version",
+ DECL_ATTRIBUTES (decl));
+ if (version_attr == NULL)
+ return 0;
+
+ const char *version_string = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE
+ (version_attr)));
+ enum aarch_parse_opt_result parse_res;
+ aarch64_fmv_feature_mask feature_mask;
+
+ parse_res = aarch64_parse_fmv_features (version_string, NULL, &feature_mask,
+ NULL);
+
+ /* We should have detected any errors before getting here. */
+ gcc_assert (parse_res == AARCH_PARSE_OK);
+
+ return feature_mask;
+}
+
+/* Compare priorities of two feature masks. Return:
+ 1: mask1 is higher priority
+ -1: mask2 is higher priority
+ 0: masks are equal. */
+
+static int
+compare_feature_masks (aarch64_fmv_feature_mask mask1,
+ aarch64_fmv_feature_mask mask2)
+{
+ int pop1 = popcount_hwi (mask1);
+ int pop2 = popcount_hwi (mask2);
+ if (pop1 > pop2)
+ return 1;
+ if (pop2 > pop1)
+ return -1;
+
+ auto diff_mask = mask1 ^ mask2;
+ if (diff_mask == 0ULL)
+ return 0;
+ for (int i = FEAT_MAX - 1; i > 0; i--)
+ {
+ auto bit_mask = aarch64_fmv_feature_data[i].feature_mask;
+ if (diff_mask & bit_mask)
+ return (mask1 & bit_mask) ? 1 : -1;
+ }
+ gcc_unreachable();
+}
+
+/* Compare priorities of two version decls. */
+
+int
+aarch64_compare_version_priority (tree decl1, tree decl2)
+{
+ auto mask1 = get_feature_mask_for_version (decl1);
+ auto mask2 = get_feature_mask_for_version (decl2);
+
+ return compare_feature_masks (mask1, mask2);
+}
+
+/* Build the struct __ifunc_arg_t type:
+
+ struct __ifunc_arg_t
+ {
+ unsigned long _size; // Size of the struct, so it can grow.
+ unsigned long _hwcap;
+ unsigned long _hwcap2;
+ }
+ */
+
+static tree
+build_ifunc_arg_type ()
+{
+ tree ifunc_arg_type = lang_hooks.types.make_type (RECORD_TYPE);
+ tree field1 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
+ get_identifier ("_size"),
+ long_unsigned_type_node);
+ tree field2 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
+ get_identifier ("_hwcap"),
+ long_unsigned_type_node);
+ tree field3 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
+ get_identifier ("_hwcap2"),
+ long_unsigned_type_node);
+
+ DECL_FIELD_CONTEXT (field1) = ifunc_arg_type;
+ DECL_FIELD_CONTEXT (field2) = ifunc_arg_type;
+ DECL_FIELD_CONTEXT (field3) = ifunc_arg_type;
+
+ TYPE_FIELDS (ifunc_arg_type) = field1;
+ DECL_CHAIN (field1) = field2;
+ DECL_CHAIN (field2) = field3;
+
+ layout_type (ifunc_arg_type);
+
+ tree const_type = build_qualified_type (ifunc_arg_type, TYPE_QUAL_CONST);
+ tree pointer_type = build_pointer_type (const_type);
+
+ return pointer_type;
+}
+
+/* Make the resolver function decl to dispatch the versions of
+ a multi-versioned function, DEFAULT_DECL. IFUNC_ALIAS_DECL is
+ ifunc alias that will point to the created resolver. Create an
+ empty basic block in the resolver and store the pointer in
+ EMPTY_BB. Return the decl of the resolver function. */
+
+static tree
+make_resolver_func (const tree default_decl,
+ const tree ifunc_alias_decl,
+ basic_block *empty_bb)
+{
+ tree decl, type, t;
+
+ /* Create resolver function name based on default_decl. */
+ tree decl_name = clone_function_name (default_decl, "resolver");
+ const char *resolver_name = IDENTIFIER_POINTER (decl_name);
+
+ /* The resolver function should have signature
+ (void *) resolver (uint64_t, const __ifunc_arg_t *) */
+ type = build_function_type_list (ptr_type_node,
+ uint64_type_node,
+ build_ifunc_arg_type (),
+ NULL_TREE);
+
+ decl = build_fn_decl (resolver_name, type);
+ SET_DECL_ASSEMBLER_NAME (decl, decl_name);
+
+ DECL_NAME (decl) = decl_name;
+ TREE_USED (decl) = 1;
+ DECL_ARTIFICIAL (decl) = 1;
+ DECL_IGNORED_P (decl) = 1;
+ TREE_PUBLIC (decl) = 0;
+ DECL_UNINLINABLE (decl) = 1;
+
+ /* Resolver is not external, body is generated. */
+ DECL_EXTERNAL (decl) = 0;
+ DECL_EXTERNAL (ifunc_alias_decl) = 0;
+
+ DECL_CONTEXT (decl) = NULL_TREE;
+ DECL_INITIAL (decl) = make_node (BLOCK);
+ DECL_STATIC_CONSTRUCTOR (decl) = 0;
+
+ if (DECL_COMDAT_GROUP (default_decl)
+ || TREE_PUBLIC (default_decl))
+ {
+ /* In this case, each translation unit with a call to this
+ versioned function will put out a resolver. Ensure it
+ is comdat to keep just one copy. */
+ DECL_COMDAT (decl) = 1;
+ make_decl_one_only (decl, DECL_ASSEMBLER_NAME (decl));
+ }
+ else
+ TREE_PUBLIC (ifunc_alias_decl) = 0;
+
+ /* Build result decl and add to function_decl. */
+ t = build_decl (UNKNOWN_LOCATION, RESULT_DECL, NULL_TREE, ptr_type_node);
+ DECL_CONTEXT (t) = decl;
+ DECL_ARTIFICIAL (t) = 1;
+ DECL_IGNORED_P (t) = 1;
+ DECL_RESULT (decl) = t;
+
+ /* Build parameter decls and add to function_decl. */
+ tree arg1 = build_decl (UNKNOWN_LOCATION, PARM_DECL,
+ get_identifier ("hwcap"),
+ uint64_type_node);
+ tree arg2 = build_decl (UNKNOWN_LOCATION, PARM_DECL,
+ get_identifier ("arg"),
+ build_ifunc_arg_type());
+ DECL_CONTEXT (arg1) = decl;
+ DECL_CONTEXT (arg2) = decl;
+ DECL_ARTIFICIAL (arg1) = 1;
+ DECL_ARTIFICIAL (arg2) = 1;
+ DECL_IGNORED_P (arg1) = 1;
+ DECL_IGNORED_P (arg2) = 1;
+ DECL_ARG_TYPE (arg1) = uint64_type_node;
+ DECL_ARG_TYPE (arg2) = build_ifunc_arg_type ();
+ DECL_ARGUMENTS (decl) = arg1;
+ TREE_CHAIN (arg1) = arg2;
+
+ gimplify_function_tree (decl);
+ push_cfun (DECL_STRUCT_FUNCTION (decl));
+ *empty_bb = init_lowered_empty_function (decl, false,
+ profile_count::uninitialized ());
+
+ cgraph_node::add_new_function (decl, true);
+ symtab->call_cgraph_insertion_hooks (cgraph_node::get_create (decl));
+
+ pop_cfun ();
+
+ gcc_assert (ifunc_alias_decl != NULL);
+ /* Mark ifunc_alias_decl as "ifunc" with resolver as resolver_name. */
+ DECL_ATTRIBUTES (ifunc_alias_decl)
+ = make_attribute ("ifunc", resolver_name,
+ DECL_ATTRIBUTES (ifunc_alias_decl));
+
+ /* Create the alias for dispatch to resolver here. */
+ cgraph_node::create_same_body_alias (ifunc_alias_decl, decl);
+ return decl;
+}
+
+/* This adds a condition to the basic_block NEW_BB in function FUNCTION_DECL
+ to return a pointer to VERSION_DECL if all feature bits specified in
+ FEATURE_MASK are not set in MASK_VAR. This function will be called during
+ version dispatch to decide which function version to execute. It returns
+ the basic block at the end, to which more conditions can be added. */
+static basic_block
+add_condition_to_bb (tree function_decl, tree version_decl,
+ aarch64_fmv_feature_mask feature_mask,
+ tree mask_var, basic_block new_bb)
+{
+ gimple *return_stmt;
+ tree convert_expr, result_var;
+ gimple *convert_stmt;
+ gimple *if_else_stmt;
+
+ basic_block bb1, bb2, bb3;
+ edge e12, e23;
+
+ gimple_seq gseq;
+
+ push_cfun (DECL_STRUCT_FUNCTION (function_decl));
+
+ gcc_assert (new_bb != NULL);
+ gseq = bb_seq (new_bb);
+
+ convert_expr = build1 (CONVERT_EXPR, ptr_type_node,
+ build_fold_addr_expr (version_decl));
+ result_var = create_tmp_var (ptr_type_node);
+ convert_stmt = gimple_build_assign (result_var, convert_expr);
+ return_stmt = gimple_build_return (result_var);
+
+ if (feature_mask == 0ULL)
+ {
+ /* Default version. */
+ gimple_seq_add_stmt (&gseq, convert_stmt);
+ gimple_seq_add_stmt (&gseq, return_stmt);
+ set_bb_seq (new_bb, gseq);
+ gimple_set_bb (convert_stmt, new_bb);
+ gimple_set_bb (return_stmt, new_bb);
+ pop_cfun ();
+ return new_bb;
+ }
+
+ tree and_expr_var = create_tmp_var (long_long_unsigned_type_node);
+ tree and_expr = build2 (BIT_AND_EXPR,
+ long_long_unsigned_type_node,
+ mask_var,
+ build_int_cst (long_long_unsigned_type_node,
+ feature_mask));
+ gimple *and_stmt = gimple_build_assign (and_expr_var, and_expr);
+ gimple_set_block (and_stmt, DECL_INITIAL (function_decl));
+ gimple_set_bb (and_stmt, new_bb);
+ gimple_seq_add_stmt (&gseq, and_stmt);
+
+ tree zero_llu = build_int_cst (long_long_unsigned_type_node, 0);
+ if_else_stmt = gimple_build_cond (EQ_EXPR, and_expr_var, zero_llu,
+ NULL_TREE, NULL_TREE);
+ gimple_set_block (if_else_stmt, DECL_INITIAL (function_decl));
+ gimple_set_bb (if_else_stmt, new_bb);
+ gimple_seq_add_stmt (&gseq, if_else_stmt);
+
+ gimple_seq_add_stmt (&gseq, convert_stmt);
+ gimple_seq_add_stmt (&gseq, return_stmt);
+ set_bb_seq (new_bb, gseq);
+
+ bb1 = new_bb;
+ e12 = split_block (bb1, if_else_stmt);
+ bb2 = e12->dest;
+ e12->flags &= ~EDGE_FALLTHRU;
+ e12->flags |= EDGE_TRUE_VALUE;
+
+ e23 = split_block (bb2, return_stmt);
+
+ gimple_set_bb (convert_stmt, bb2);
+ gimple_set_bb (return_stmt, bb2);
+
+ bb3 = e23->dest;
+ make_edge (bb1, bb3, EDGE_FALSE_VALUE);
+
+ remove_edge (e23);
+ make_edge (bb2, EXIT_BLOCK_PTR_FOR_FN (cfun), 0);
+
+ pop_cfun ();
+
+ return bb3;
+}
+
+/* This function generates the dispatch function for
+ multi-versioned functions. DISPATCH_DECL is the function which will
+ contain the dispatch logic. FNDECLS are the function choices for
+ dispatch, and is a tree chain. EMPTY_BB is the basic block pointer
+ in DISPATCH_DECL in which the dispatch code is generated. */
+
+static int
+dispatch_function_versions (tree dispatch_decl,
+ void *fndecls_p,
+ basic_block *empty_bb)
+{
+ gimple *ifunc_cpu_init_stmt;
+ gimple_seq gseq;
+ vec<tree> *fndecls;
+
+ gcc_assert (dispatch_decl != NULL
+ && fndecls_p != NULL
+ && empty_bb != NULL);
+
+ push_cfun (DECL_STRUCT_FUNCTION (dispatch_decl));
+
+ gseq = bb_seq (*empty_bb);
+ /* Function version dispatch is via IFUNC. IFUNC resolvers fire before
+ constructors, so explicity call __init_cpu_features_resolver here. */
+ tree init_fn_type = build_function_type_list (void_type_node,
+ long_unsigned_type_node,
+ build_ifunc_arg_type(),
+ NULL);
+ tree init_fn_id = get_identifier ("__init_cpu_features_resolver");
+ tree init_fn_decl = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
+ init_fn_id, init_fn_type);
+ tree arg1 = DECL_ARGUMENTS (dispatch_decl);
+ tree arg2 = TREE_CHAIN (arg1);
+ ifunc_cpu_init_stmt = gimple_build_call (init_fn_decl, 2, arg1, arg2);
+ gimple_seq_add_stmt (&gseq, ifunc_cpu_init_stmt);
+ gimple_set_bb (ifunc_cpu_init_stmt, *empty_bb);
+
+ /* Build the struct type for __aarch64_cpu_features. */
+ tree global_type = lang_hooks.types.make_type (RECORD_TYPE);
+ tree field1 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
+ get_identifier ("features"),
+ long_long_unsigned_type_node);
+ DECL_FIELD_CONTEXT (field1) = global_type;
+ TYPE_FIELDS (global_type) = field1;
+ layout_type (global_type);
+
+ tree global_var = build_decl (UNKNOWN_LOCATION, VAR_DECL,
+ get_identifier ("__aarch64_cpu_features"),
+ global_type);
+ DECL_EXTERNAL (global_var) = 1;
+ tree mask_var = create_tmp_var (long_long_unsigned_type_node);
+
+ tree component_expr = build3 (COMPONENT_REF, long_long_unsigned_type_node,
+ global_var, field1, NULL_TREE);
+ gimple *component_stmt = gimple_build_assign (mask_var, component_expr);
+ gimple_set_block (component_stmt, DECL_INITIAL (dispatch_decl));
+ gimple_set_bb (component_stmt, *empty_bb);
+ gimple_seq_add_stmt (&gseq, component_stmt);
+
+ tree not_expr = build1 (BIT_NOT_EXPR, long_long_unsigned_type_node, mask_var);
+ gimple *not_stmt = gimple_build_assign (mask_var, not_expr);
+ gimple_set_block (not_stmt, DECL_INITIAL (dispatch_decl));
+ gimple_set_bb (not_stmt, *empty_bb);
+ gimple_seq_add_stmt (&gseq, not_stmt);
+
+ set_bb_seq (*empty_bb, gseq);
+
+ pop_cfun ();
+
+ /* fndecls_p is actually a vector. */
+ fndecls = static_cast<vec<tree> *> (fndecls_p);
+
+ /* At least one more version other than the default. */
+ unsigned int num_versions = fndecls->length ();
+ gcc_assert (num_versions >= 2);
+
+ struct function_version_info
+ {
+ tree version_decl;
+ aarch64_fmv_feature_mask feature_mask;
+ } *function_versions;
+
+ function_versions = (struct function_version_info *)
+ XNEWVEC (struct function_version_info, (num_versions));
+
+ unsigned int actual_versions = 0;
+
+ for (tree version_decl : *fndecls)
+ {
+ aarch64_fmv_feature_mask feature_mask;
+ /* Get attribute string, parse it and find the right features. */
+ feature_mask = get_feature_mask_for_version (version_decl);
+ function_versions [actual_versions].version_decl = version_decl;
+ function_versions [actual_versions].feature_mask = feature_mask;
+ actual_versions++;
+ }
+
+ auto compare_feature_version_info = [](const void *p1, const void *p2) {
+ const function_version_info v1 = *(const function_version_info *)p1;
+ const function_version_info v2 = *(const function_version_info *)p2;
+ return - compare_feature_masks (v1.feature_mask, v2.feature_mask);
+ };
+
+ /* Sort the versions according to descending order of dispatch priority. */
+ qsort (function_versions, actual_versions,
+ sizeof (struct function_version_info), compare_feature_version_info);
+
+ for (unsigned int i = 0; i < actual_versions; ++i)
+ *empty_bb = add_condition_to_bb (dispatch_decl,
+ function_versions[i].version_decl,
+ function_versions[i].feature_mask,
+ mask_var,
+ *empty_bb);
+
+ free (function_versions);
+ return 0;
+}
+
+/* Implement TARGET_GENERATE_VERSION_DISPATCHER_BODY. */
+
+tree
+aarch64_generate_version_dispatcher_body (void *node_p)
+{
+ tree resolver_decl;
+ basic_block empty_bb;
+ tree default_ver_decl;
+ struct cgraph_node *versn;
+ struct cgraph_node *node;
+
+ struct cgraph_function_version_info *node_version_info = NULL;
+ struct cgraph_function_version_info *versn_info = NULL;
+
+ node = (cgraph_node *)node_p;
+
+ node_version_info = node->function_version ();
+ gcc_assert (node->dispatcher_function
+ && node_version_info != NULL);
+
+ if (node_version_info->dispatcher_resolver)
+ return node_version_info->dispatcher_resolver;
+
+ /* The first version in the chain corresponds to the default version. */
+ default_ver_decl = node_version_info->next->this_node->decl;
+
+ /* node is going to be an alias, so remove the finalized bit. */
+ node->definition = false;
+
+ resolver_decl = make_resolver_func (default_ver_decl,
+ node->decl, &empty_bb);
+
+ node_version_info->dispatcher_resolver = resolver_decl;
+
+ push_cfun (DECL_STRUCT_FUNCTION (resolver_decl));
+
+ auto_vec<tree, 2> fn_ver_vec;
+
+ for (versn_info = node_version_info->next; versn_info;
+ versn_info = versn_info->next)
+ {
+ versn = versn_info->this_node;
+ /* Check for virtual functions here again, as by this time it should
+ have been determined if this function needs a vtable index or
+ not. This happens for methods in derived classes that override
+ virtual methods in base classes but are not explicitly marked as
+ virtual. */
+ if (DECL_VINDEX (versn->decl))
+ sorry ("virtual function multiversioning not supported");
+
+ fn_ver_vec.safe_push (versn->decl);
+ }
+
+ dispatch_function_versions (resolver_decl, &fn_ver_vec, &empty_bb);
+ cgraph_edge::rebuild_edges ();
+ pop_cfun ();
+ return resolver_decl;
+}
+
+/* Make a dispatcher declaration for the multi-versioned function DECL.
+ Calls to DECL function will be replaced with calls to the dispatcher
+ by the front-end. Returns the decl of the dispatcher function. */
+
+tree
+aarch64_get_function_versions_dispatcher (void *decl)
+{
+ tree fn = (tree) decl;
+ struct cgraph_node *node = NULL;
+ struct cgraph_node *default_node = NULL;
+ struct cgraph_function_version_info *node_v = NULL;
+ struct cgraph_function_version_info *first_v = NULL;
+
+ tree dispatch_decl = NULL;
+
+ struct cgraph_function_version_info *default_version_info = NULL;
+
+ gcc_assert (fn != NULL && DECL_FUNCTION_VERSIONED (fn));
+
+ node = cgraph_node::get (fn);
+ gcc_assert (node != NULL);
+
+ node_v = node->function_version ();
+ gcc_assert (node_v != NULL);
+
+ if (node_v->dispatcher_resolver != NULL)
+ return node_v->dispatcher_resolver;
+
+ /* Find the default version and make it the first node. */
+ first_v = node_v;
+ /* Go to the beginning of the chain. */
+ while (first_v->prev != NULL)
+ first_v = first_v->prev;
+ default_version_info = first_v;
+ while (default_version_info != NULL)
+ {
+ if (get_feature_mask_for_version
+ (default_version_info->this_node->decl) == 0ULL)
+ break;
+ default_version_info = default_version_info->next;
+ }
+
+ /* If there is no default node, just return NULL. */
+ if (default_version_info == NULL)
+ return NULL;
+
+ /* Make default info the first node. */
+ if (first_v != default_version_info)
+ {
+ default_version_info->prev->next = default_version_info->next;
+ if (default_version_info->next)
+ default_version_info->next->prev = default_version_info->prev;
+ first_v->prev = default_version_info;
+ default_version_info->next = first_v;
+ default_version_info->prev = NULL;
+ }
+
+ default_node = default_version_info->this_node;
+
+ if (targetm.has_ifunc_p ())
+ {
+ struct cgraph_function_version_info *it_v = NULL;
+ struct cgraph_node *dispatcher_node = NULL;
+ struct cgraph_function_version_info *dispatcher_version_info = NULL;
+
+ /* Right now, the dispatching is done via ifunc. */
+ dispatch_decl = make_dispatcher_decl (default_node->decl);
+ TREE_NOTHROW (dispatch_decl) = TREE_NOTHROW (fn);
+
+ dispatcher_node = cgraph_node::get_create (dispatch_decl);
+ gcc_assert (dispatcher_node != NULL);
+ dispatcher_node->dispatcher_function = 1;
+ dispatcher_version_info
+ = dispatcher_node->insert_new_function_version ();
+ dispatcher_version_info->next = default_version_info;
+ dispatcher_node->definition = 1;
+
+ /* Set the dispatcher for all the versions. */
+ it_v = default_version_info;
+ while (it_v != NULL)
+ {
+ it_v->dispatcher_resolver = dispatch_decl;
+ it_v = it_v->next;
+ }
+ }
+ else
+ {
+ error_at (DECL_SOURCE_LOCATION (default_node->decl),
+ "multiversioning needs %<ifunc%> which is not supported "
+ "on this target");
+ }
+
+ return dispatch_decl;
+}
+
+/* This function returns true if FN1 and FN2 are versions of the same function,
+ that is, the target_version attributes of the function decls are different.
+ This assumes that FN1 and FN2 have the same signature. */
+
+bool
+aarch64_common_function_versions (tree fn1, tree fn2)
+{
+ if (TREE_CODE (fn1) != FUNCTION_DECL
+ || TREE_CODE (fn2) != FUNCTION_DECL)
+ return false;
+
+ return (aarch64_compare_version_priority (fn1, fn2) != 0);
+}
+
+/* Implement TARGET_MANGLE_DECL_ASSEMBLER_NAME, to add function multiversioning
+ suffixes. */
+
+tree
+aarch64_mangle_decl_assembler_name (tree decl, tree id)
+{
+ /* For function version, add the target suffix to the assembler name. */
+ if (TREE_CODE (decl) == FUNCTION_DECL
+ && DECL_FUNCTION_VERSIONED (decl))
+ {
+ aarch64_fmv_feature_mask feature_mask = get_feature_mask_for_version (decl);
+
+ /* No suffix for the default version. */
+ if (feature_mask == 0ULL)
+ return id;
+
+ std::string name = IDENTIFIER_POINTER (id);
+ name += "._";
+
+ for (int i = 0; i < FEAT_MAX; i++)
+ {
+ if (feature_mask & aarch64_fmv_feature_data[i].feature_mask)
+ {
+ name += "M";
+ name += aarch64_fmv_feature_data[i].name;
+ }
+ }
+
+ if (DECL_ASSEMBLER_NAME_SET_P (decl))
+ SET_DECL_RTL (decl, NULL);
+
+ id = get_identifier (name.c_str());
+ }
+ return id;
+}
+
/* Helper for aarch64_can_inline_p. In the case where CALLER and CALLEE are
tri-bool options (yes, no, don't care) and the default value is
DEF, determine whether to reject inlining. */
@@ -26095,6 +26936,10 @@ aarch64_libgcc_floating_mode_supported_p
#undef TARGET_OPTION_VALID_ATTRIBUTE_P
#define TARGET_OPTION_VALID_ATTRIBUTE_P aarch64_option_valid_attribute_p
+#undef TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P
+#define TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P \
+ aarch64_option_valid_version_attribute_p
+
#undef TARGET_SET_CURRENT_FUNCTION
#define TARGET_SET_CURRENT_FUNCTION aarch64_set_current_function
@@ -26425,6 +27270,24 @@ aarch64_libgcc_floating_mode_supported_p
#undef TARGET_CONST_ANCHOR
#define TARGET_CONST_ANCHOR 0x1000000
+#undef TARGET_OPTION_FUNCTION_VERSIONS
+#define TARGET_OPTION_FUNCTION_VERSIONS aarch64_common_function_versions
+
+#undef TARGET_COMPARE_VERSION_PRIORITY
+#define TARGET_COMPARE_VERSION_PRIORITY aarch64_compare_version_priority
+
+#undef TARGET_GENERATE_VERSION_DISPATCHER_BODY
+#define TARGET_GENERATE_VERSION_DISPATCHER_BODY \
+ aarch64_generate_version_dispatcher_body
+
+#undef TARGET_GET_FUNCTION_VERSIONS_DISPATCHER
+#define TARGET_GET_FUNCTION_VERSIONS_DISPATCHER \
+ aarch64_get_function_versions_dispatcher
+
+#undef TARGET_MANGLE_DECL_ASSEMBLER_NAME
+#define TARGET_MANGLE_DECL_ASSEMBLER_NAME aarch64_mangle_decl_assembler_name
+
+
struct gcc_target targetm = TARGET_INITIALIZER;
#include "gt-aarch64.h"
diff --git a/gcc/config/arm/aarch-common.h b/gcc/config/arm/aarch-common.h
index c6a67f0d05cc75d85d019e1cc910c37173884c03..70f01fd3da6919dd98cfe92bfc4c54b7d2cba72c 100644
--- a/gcc/config/arm/aarch-common.h
+++ b/gcc/config/arm/aarch-common.h
@@ -23,7 +23,7 @@
#define GCC_AARCH_COMMON_H
/* Enum describing the various ways that the
- aarch*_parse_{arch,tune,cpu,extension} functions can fail.
+ aarch*_parse_{arch,tune,cpu,extension,fmv_extension} functions can fail.
This way their callers can choose what kind of error to give. */
enum aarch_parse_opt_result
@@ -31,7 +31,8 @@ enum aarch_parse_opt_result
AARCH_PARSE_OK, /* Parsing was successful. */
AARCH_PARSE_MISSING_ARG, /* Missing argument. */
AARCH_PARSE_INVALID_FEATURE, /* Invalid feature modifier. */
- AARCH_PARSE_INVALID_ARG /* Invalid arch, tune, cpu arg. */
+ AARCH_PARSE_INVALID_ARG, /* Invalid arch, tune, cpu arg. */
+ AARCH_PARSE_DUPLICATE_FEATURE /* Duplicate feature modifier. */
};
/* Function types -msign-return-address should sign. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c
index fb5a7a18ad1a2d09ac4b231150a1bd9e72d6fab6..c175e22f88fd5165d42866eb989de8af3ee5f6c6 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c
@@ -7,6 +7,6 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\n} } } */
/* Test a normal looking procinfo. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c
index b29d50e1f79f92e45add1627904a695c511aec75..0264a4737103ce093741d4f0b161f78cd18a0d6a 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c
@@ -7,6 +7,6 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\n} } } */
/* Test one with mixed order of feature bits. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c
index b3613165a05bf2fd1e93e6d89361ae9969ed62ba..649e48e7e0b727cef573ff12f1e3efb90bbb5e7f 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c
@@ -7,6 +7,6 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\+sve2\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\+sve2\n} } } */
/* Test a normal looking procinfo. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c
index a9dde5ffab1405488d15d58c6420890a1b16e16a..078d7bc899ccd01c70369fe985268949c351da0b 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c
@@ -7,6 +7,6 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\+sve2\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\+sve2\n} } } */
/* Test a normal looking procinfo. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c
index 10325df4497227a80297a140c9e1d689fccf96ef..57eedb463091f051c19533c054204f9352b6446e 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8.6-a\+crc\+fp16\+aes\+sha3\+rng\+nopauth\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8.6-a\+rng\+crc\+aes\+sha3\+fp16\+nopauth\n} } } */
/* Test one where the boundary of buffer size would overwrite the last
character read when stitching the fgets-calls together. With the
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c
index 980d3f79dfb03b0d8eb68f691bf2dedf80aed87d..a5b4b4d3442c6522a8cdadf4eebd3b5460e37213 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+profile\+memtag\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\+nopauth\n} } } */
+/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+memtag\+profile\+nopauth\n} } } */
/* Test one that if the kernel doesn't report the availability of a mandatory
feature that it has turned it off for whatever reason. As such compilers
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c
index 117df2b0b6cd5751d9f5175b4343aad9825a6c43..e12aa543d02924f268729f96fe1f17181287f097 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+profile\+memtag\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\n} } } */
+/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+memtag\+profile\n} } } */
/* Check whether features that don't have a midr name during detection are
correctly ignored. These features shouldn't affect the native detection.
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c
index efbd02cbdc0638db85e776f1e79043709c11df21..920e1d65711cbcb77b07441597180c0159ccabf9 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+lse\+rcpc\+rdma\+dotprod\+fp16fml\+sb\+ssbs\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\+flagm\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+flagm\+dotprod\+rdma\+lse\+crc\+fp16fml\+rcpc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+sb\+ssbs\n} } } */
/* Check that an Armv8-A core doesn't fall apart on extensions without midr
values. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c
index d431d4938265d024891b464ac3d069607b21d8e7..416a29b514ab7599a7092e26e3716ec8a50cc895 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+lse\+rcpc\+rdma\+dotprod\+fp16fml\+sb\+ssbs\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\+flagm\+pauth\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+flagm\+dotprod\+rdma\+lse\+crc\+fp16fml\+rcpc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+sb\+ssbs\+pauth\n} } } */
/* Check that an Armv8-A core doesn't fall apart on extensions without midr
values and that it enables optional features. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c
index 20012beff7b85c14817e38437650d412ab7bb137..5d39a2d8c4da5de6ed7ec832db90ae7f625d997d 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+fp16\+crypto\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+crypto\+fp16\n} } } */
-/* Test one where the feature bits for crypto and fp16 are given in
- same order as declared in options file. */
+/* Test one where the crypto and fp16 options are specified in different
+ order from what is in the options file. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c
index 70a7e62fdffc4a908df083505c03a5fde70ce883..67c4bc2b9ea446201666c9810c779d1823a5cb9b 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+fp16\+crypto\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+crypto\+fp16\n} } } */
-/* Test one where the crypto and fp16 options are specified in different
- order from what is in the options file. */
+/* Test one where the feature bits for crypto and fp16 are given in
+ same order as declared in options file. */
diff --git a/gcc/testsuite/gcc.target/aarch64/options_set_17.c b/gcc/testsuite/gcc.target/aarch64/options_set_17.c
index 8b21e2e1a0a0d4c7daa13fc6c3e4968786474a74..b1603fbcf2a1b27c00fe2b47a8a65af551a3d726 100644
--- a/gcc/testsuite/gcc.target/aarch64/options_set_17.c
+++ b/gcc/testsuite/gcc.target/aarch64/options_set_17.c
@@ -6,6 +6,6 @@ int main ()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8\.2-a\+crc\+dotprod\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8\.2-a\+dotprod\+crc\n} } } */
/* dotprod needs to be emitted pre armv8.4. */
diff --git a/libgcc/config/aarch64/cpuinfo.c b/libgcc/config/aarch64/cpuinfo.c
index 634f591c194bc70048f714d7eb0ace1f2f4137ea..72185bee7cdd062e20a3e9f6f627f4120d1b2fb5 100644
--- a/libgcc/config/aarch64/cpuinfo.c
+++ b/libgcc/config/aarch64/cpuinfo.c
@@ -22,6 +22,8 @@
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
+#include "common/config/aarch64/cpuinfo.h"
+
#if __has_include(<sys/auxv.h>)
#include <sys/auxv.h>
@@ -38,73 +40,6 @@ typedef struct __ifunc_arg_t {
#if __has_include(<asm/hwcap.h>)
#include <asm/hwcap.h>
-/* CPUFeatures must correspond to the same AArch64 features in aarch64.cc */
-enum CPUFeatures {
- FEAT_RNG,
- FEAT_FLAGM,
- FEAT_FLAGM2,
- FEAT_FP16FML,
- FEAT_DOTPROD,
- FEAT_SM4,
- FEAT_RDM,
- FEAT_LSE,
- FEAT_FP,
- FEAT_SIMD,
- FEAT_CRC,
- FEAT_SHA1,
- FEAT_SHA2,
- FEAT_SHA3,
- FEAT_AES,
- FEAT_PMULL,
- FEAT_FP16,
- FEAT_DIT,
- FEAT_DPB,
- FEAT_DPB2,
- FEAT_JSCVT,
- FEAT_FCMA,
- FEAT_RCPC,
- FEAT_RCPC2,
- FEAT_FRINTTS,
- FEAT_DGH,
- FEAT_I8MM,
- FEAT_BF16,
- FEAT_EBF16,
- FEAT_RPRES,
- FEAT_SVE,
- FEAT_SVE_BF16,
- FEAT_SVE_EBF16,
- FEAT_SVE_I8MM,
- FEAT_SVE_F32MM,
- FEAT_SVE_F64MM,
- FEAT_SVE2,
- FEAT_SVE_AES,
- FEAT_SVE_PMULL128,
- FEAT_SVE_BITPERM,
- FEAT_SVE_SHA3,
- FEAT_SVE_SM4,
- FEAT_SME,
- FEAT_MEMTAG,
- FEAT_MEMTAG2,
- FEAT_MEMTAG3,
- FEAT_SB,
- FEAT_PREDRES,
- FEAT_SSBS,
- FEAT_SSBS2,
- FEAT_BTI,
- FEAT_LS64,
- FEAT_LS64_V,
- FEAT_LS64_ACCDATA,
- FEAT_WFXT,
- FEAT_SME_F64,
- FEAT_SME_I64,
- FEAT_SME2,
- FEAT_RCPC3,
- FEAT_MAX,
- FEAT_EXT = 62, /* Reserved to indicate presence of additional features field
- in __aarch64_cpu_features. */
- FEAT_INIT /* Used as flag of features initialization completion. */
-};
-
/* Architecture features used in Function Multi Versioning. */
struct {
unsigned long long features;
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v3 5/5] aarch64: Add function multiversioning support
2023-12-06 12:47 ` [PATCH v3 5/5] aarch64: Add function multiversioning support Andrew Carlotti
@ 2023-12-14 14:02 ` Richard Sandiford
2023-12-16 0:47 ` [committed v4 " Andrew Carlotti
0 siblings, 1 reply; 11+ messages in thread
From: Richard Sandiford @ 2023-12-14 14:02 UTC (permalink / raw)
To: Andrew Carlotti; +Cc: gcc-patches, Richard Biener
Andrew Carlotti <andrew.carlotti@arm.com> writes:
> This adds initial support for function multiversioning on aarch64 using
> the target_version and target_clones attributes. This loosely follows
> the Beta specification in the ACLE [1], although with some differences
> that still need to be resolved (possibly as follow-up patches).
>
> Existing function multiversioning implementations are broken in various
> ways when used across translation units. This includes placing
> resolvers in the wrong translation units, and using symbol mangling that
> callers to unintentionally bypass the resolver in some circumstances.
> Fixing these issues for aarch64 will require modifications to our ACLE
> specification. It will also require further adjustments to existing
> middle end code, to facilitate different mangling and resolver
> placement while preserving existing target behaviours.
>
> The list of function multiversioning features specified in the ACLE is
> also inconsistent with the list of features supported in target option
> extensions. I intend to resolve some or all of these inconsistencies at
> a later stage.
>
> The target_version attribute is currently only supported in C++, since
> this is the only frontend with existing support for multiversioning
> using the target attribute. On the other hand, this patch happens to
> enable multiversioning with the target_clones attribute in Ada and D, as
> well as the entire C family, using their existing frontend support.
>
> This patch also does not support the following aspects of the Beta
> specification:
>
> - The target_clones attribute should allow an implicit unlisted
> "default" version.
> - There should be an option to disable function multiversioning at
> compile time.
> - Unrecognised target names in a target_clones attribute should be
> ignored (with an optional warning). This current patch raises an
> error instead.
>
> [1] https://github.com/ARM-software/acle/blob/main/main/acle.md#function-multi-versioning
>
> ---
>
> I believe the support present in this patch correctly handles function
> multiversioning within a single translation unit for all features in the ACLE
> specification with option extension support.
>
> Is it ok to push this patch in its current state? I'd then continue working on
> incremental improvements to the supported feature extensions and the ABI issues
> in followup patches, along with corresponding changes and improvements to the
> ACLE specification.
>
>
> gcc/ChangeLog:
>
> * config/aarch64/aarch64-feature-deps.h (fmv_deps_<FEAT_NAME>):
> Define aarch64_feature_flags mask foreach FMV feature.
> * config/aarch64/aarch64-option-extensions.def: Use new macros
> to define FMV feature extensions.
> * config/aarch64/aarch64.cc (aarch64_option_valid_attribute_p):
> Check for target_version attribute after processing target
> attribute.
> (aarch64_fmv_feature_data): New.
> (aarch64_parse_fmv_features): New.
> (aarch64_process_target_version_attr): New.
> (aarch64_option_valid_version_attribute_p): New.
> (get_feature_mask_for_version): New.
> (compare_feature_masks): New.
> (aarch64_compare_version_priority): New.
> (build_ifunc_arg_type): New.
> (make_resolver_func): New.
> (add_condition_to_bb): New.
> (dispatch_function_versions): New.
> (aarch64_generate_version_dispatcher_body): New.
> (aarch64_get_function_versions_dispatcher): New.
> (aarch64_common_function_versions): New.
> (aarch64_mangle_decl_assembler_name): New.
> (TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P): New implementation.
> (TARGET_OPTION_EXPANDED_CLONES_ATTRIBUTE): New implementation.
> (TARGET_OPTION_FUNCTION_VERSIONS): New implementation.
> (TARGET_COMPARE_VERSION_PRIORITY): New implementation.
> (TARGET_GENERATE_VERSION_DISPATCHER_BODY): New implementation.
> (TARGET_GET_FUNCTION_VERSIONS_DISPATCHER): New implementation.
> (TARGET_MANGLE_DECL_ASSEMBLER_NAME): New implementation.
> * config/aarch64/aarch64.h (TARGET_HAS_FMV_TARGET_ATTRIBUTE):
> Set target macro.
> * config/arm/aarch-common.h (enum aarch_parse_opt_result): Add
> new value to report duplicate FMV feature.
> * common/config/aarch64/cpuinfo.h: New file.
>
> libgcc/ChangeLog:
>
> * config/aarch64/cpuinfo.c (enum CPUFeatures): Move to shared
> copy in gcc/common
>
> gcc/testsuite/ChangeLog:
>
> * gcc.target/aarch64/options_set_17.c: Reorder expected flags.
> * gcc.target/aarch64/cpunative/native_cpu_0.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_13.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_16.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_17.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_18.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_19.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_20.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_21.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_22.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_6.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_7.c: Ditto.
Looks good, thanks. OK for trunk with one trivial fix:
> [...]
> +/* Implement TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P. This is used to
> + process attribute ((target_version ("..."))). */
> +
> +static bool
> +aarch64_option_valid_version_attribute_p (tree fndecl, tree, tree args, int)
> +{
> + struct cl_target_option cur_target;
> + bool ret;
> + tree new_target;
> + tree existing_target = DECL_FUNCTION_SPECIFIC_TARGET (fndecl);
> +
> + /* Save the current target options to restore at the end. */
> + cl_target_option_save (&cur_target, &global_options, &global_options_set);
> +
> + /* If fndecl already has some target attributes applied to it, unpack
> + them so that we add this attribute on top of them, rather than
> + overwriting them. */
> + if (existing_target)
> + {
> + struct cl_target_option *existing_options
> + = TREE_TARGET_OPTION (existing_target);
> +
> + if (existing_options)
> + cl_target_option_restore (&global_options, &global_options_set,
> + existing_options);
> + }
> + else
> + cl_target_option_restore (&global_options, &global_options_set,
> + TREE_TARGET_OPTION (target_option_current_node));
> +
> + ret = aarch64_process_target_version_attr (args);
> +
> + /* Set up any additional state. */
> + if (ret)
> + {
> + aarch64_override_options_internal (&global_options);
> + new_target = build_target_option_node (&global_options,
> + &global_options_set);
> + }
> + else
> + new_target = NULL;
> +
> + if (fndecl && ret)
> + {
> + DECL_FUNCTION_SPECIFIC_TARGET (fndecl) = new_target;
> + }
Formatting nit: should be:
if (fndecl && ret)
DECL_FUNCTION_SPECIFIC_TARGET (fndecl) = new_target;
without the braces.
Richard
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v3 4/5] Add support for target_version attribute
2023-12-06 12:46 ` [PATCH v3 4/5] Add support for target_version attribute Andrew Carlotti
@ 2023-12-14 14:58 ` Richard Sandiford
2023-12-16 0:45 ` [committed v4 " Andrew Carlotti
0 siblings, 1 reply; 11+ messages in thread
From: Richard Sandiford @ 2023-12-14 14:58 UTC (permalink / raw)
To: Andrew Carlotti; +Cc: gcc-patches, Richard Biener
Andrew Carlotti <andrew.carlotti@arm.com> writes:
> This patch adds support for the "target_version" attribute to the middle
> end and the C++ frontend, which will be used to implement function
> multiversioning in the aarch64 backend.
>
> On targets that don't use the "target" attribute for multiversioning,
> there is no conflict between the "target" and "target_clones"
> attributes. This patch therefore makes the mutual exclusion in
> C-family, D and Ada conditonal upon the value of the
> expanded_clones_attribute target hook.
>
> The "target_version" attribute is only added to C++ in this patch,
> because this is currently the only frontend which supports
> multiversioning using the "target" attribute. Support for the
> "target_version" attribute will be extended to C at a later date.
>
> Targets that currently use the "target" attribute for function
> multiversioning (i.e. i386 and rs6000) are not affected by this patch.
>
> Ok for master?
>
> gcc/ChangeLog:
>
> * attribs.cc (decl_attributes): Pass attribute name to target.
> (is_function_default_version): Update comment to specify
> incompatibility with target_version attributes.
> * cgraphclones.cc (cgraph_node::create_version_clone_with_body):
> Call valid_version_attribute_p for target_version attributes.
> * defaults.h (TARGET_HAS_FMV_TARGET_ATTRIBUTE): New macro.
> * target.def (valid_version_attribute_p): New hook.
> * doc/tm.texi.in: Add new hook.
> * doc/tm.texi: Regenerate.
> * multiple_target.cc (create_dispatcher_calls): Remove redundant
> is_function_default_version check.
> (expand_target_clones): Use target macro to pick attribute name.
> * targhooks.cc (default_target_option_valid_version_attribute_p):
> New.
> * targhooks.h (default_target_option_valid_version_attribute_p):
> New.
> * tree.h (DECL_FUNCTION_VERSIONED): Update comment to include
> target_version attributes.
>
> gcc/c-family/ChangeLog:
>
> * c-attribs.cc (attr_target_exclusions): Make
> target/target_clones exclusion target-dependent.
> (attr_target_clones_exclusions): Ditto, and add target_version.
> (attr_target_version_exclusions): New.
> (c_common_attribute_table): Add target_version.
> (handle_target_version_attribute): New.
>
> gcc/ada/ChangeLog:
>
> * gcc-interface/utils.cc (attr_target_exclusions): Make
> target/target_clones exclusion target-dependent.
> (attr_target_clones_exclusions): Ditto.
>
> gcc/d/ChangeLog:
>
> * d-attribs.cc (attr_target_exclusions): Make
> target/target_clones exclusion target-dependent.
> (attr_target_clones_exclusions): Ditto.
>
> gcc/cp/ChangeLog:
>
> * decl2.cc (check_classfn): Update comment to include
> target_version attributes.
The front-end changes look mechanical, so: OK with the nit below fixed
unless anyone objects in 24 hours, or asks for more time.
> diff --git a/gcc/ada/gcc-interface/utils.cc b/gcc/ada/gcc-interface/utils.cc
> index f2c504ddf8d3df11abe81aec695c9eea0b39da6c..5d946c33b212c5ea50e7a73524e8c1d062280956 100644
> --- a/gcc/ada/gcc-interface/utils.cc
> +++ b/gcc/ada/gcc-interface/utils.cc
> @@ -145,14 +145,16 @@ static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
>
> static const struct attribute_spec::exclusions attr_target_exclusions[] =
> {
> - { "target_clones", true, true, true },
> + { "target_clones", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
> + TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE },
> { NULL, false, false, false },
> };
>
> static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
> {
> { "always_inline", true, true, true },
> - { "target", true, true, true },
> + { "target", TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE,
> + TARGET_HAS_FMV_TARGET_ATTRIBUTE },
> { NULL, false, false, false },
> };
>
> diff --git a/gcc/attribs.cc b/gcc/attribs.cc
> index c7209c26acc9faf699774b0ef669ec6748b9073d..19cccf2d7ca4fdd6a46a01884393c6779333dbc5 100644
> --- a/gcc/attribs.cc
> +++ b/gcc/attribs.cc
> @@ -657,7 +657,8 @@ decl_attributes (tree *node, tree attributes, int flags,
> options to the attribute((target(...))) list. */
> if (TREE_CODE (*node) == FUNCTION_DECL
> && current_target_pragma
> - && targetm.target_option.valid_attribute_p (*node, NULL_TREE,
> + && targetm.target_option.valid_attribute_p (*node,
> + get_identifier ("target"),
> current_target_pragma, 0))
> {
> tree cur_attr = lookup_attribute ("target", attributes);
> @@ -1241,8 +1242,9 @@ make_dispatcher_decl (const tree decl)
> return func_decl;
> }
>
> -/* Returns true if decl is multi-versioned and DECL is the default function,
> - that is it is not tagged with target specific optimization. */
> +/* Returns true if DECL is multi-versioned using the target attribute, and this
> + is the default version. This function can only be used for targets that do
> + not support the "target_version" attribute. */
>
> bool
> is_function_default_version (const tree decl)
> diff --git a/gcc/c-family/c-attribs.cc b/gcc/c-family/c-attribs.cc
> index b3b41ef123a0f171f57acb1b7f7fdde716428c00..eabc11c00f09125b7d6e2c47f3b083a03909825c 100644
> --- a/gcc/c-family/c-attribs.cc
> +++ b/gcc/c-family/c-attribs.cc
> @@ -149,6 +149,7 @@ static tree handle_alloc_align_attribute (tree *, tree, tree, int, bool *);
> static tree handle_assume_aligned_attribute (tree *, tree, tree, int, bool *);
> static tree handle_assume_attribute (tree *, tree, tree, int, bool *);
> static tree handle_target_attribute (tree *, tree, tree, int, bool *);
> +static tree handle_target_version_attribute (tree *, tree, tree, int, bool *);
> static tree handle_target_clones_attribute (tree *, tree, tree, int, bool *);
> static tree handle_optimize_attribute (tree *, tree, tree, int, bool *);
> static tree ignore_attribute (tree *, tree, tree, int, bool *);
> @@ -230,14 +231,23 @@ static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
>
> static const struct attribute_spec::exclusions attr_target_exclusions[] =
> {
> - ATTR_EXCL ("target_clones", true, true, true),
> + ATTR_EXCL ("target_clones", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
> + TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
> ATTR_EXCL (NULL, false, false, false),
> };
>
> static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
> {
> ATTR_EXCL ("always_inline", true, true, true),
> - ATTR_EXCL ("target", true, true, true),
> + ATTR_EXCL ("target", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
> + TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
> + ATTR_EXCL ("target_version", true, true, true),
> + ATTR_EXCL (NULL, false, false, false),
> +};
> +
> +static const struct attribute_spec::exclusions attr_target_version_exclusions[] =
> +{
> + ATTR_EXCL ("target_clones", true, true, true),
> ATTR_EXCL (NULL, false, false, false),
> };
>
> @@ -505,6 +515,9 @@ const struct attribute_spec c_common_attribute_table[] =
> { "target", 1, -1, true, false, false, false,
> handle_target_attribute,
> attr_target_exclusions },
> + { "target_version", 1, 1, true, false, false, false,
> + handle_target_version_attribute,
> + attr_target_version_exclusions },
> { "target_clones", 1, -1, true, false, false, false,
> handle_target_clones_attribute,
> attr_target_clones_exclusions },
> @@ -5670,6 +5683,25 @@ handle_target_attribute (tree *node, tree name, tree args, int flags,
> return NULL_TREE;
> }
>
> +/* Handle a "target_version" attribute. */
> +
> +static tree
> +handle_target_version_attribute (tree *node, tree name, tree args, int flags,
> + bool *no_add_attrs)
> +{
> + /* Ensure we have a function type. */
Sorry for not noticing before, but: s/function type/function declaration/.
Thanks,
Richard
> + if (TREE_CODE (*node) != FUNCTION_DECL)
> + {
> + warning (OPT_Wattributes, "%qE attribute ignored", name);
> + *no_add_attrs = true;
> + }
> + else if (!targetm.target_option.valid_version_attribute_p (*node, name, args,
> + flags))
> + *no_add_attrs = true;
> +
> + return NULL_TREE;
> +}
> +
> /* Handle a "target_clones" attribute. */
>
> static tree
> diff --git a/gcc/cgraphclones.cc b/gcc/cgraphclones.cc
> index 29d28ef895a73a223695cbb86aafbc845bbe7688..3ba5a4a2dd9fd4b7206d95f01c990818d0440334 100644
> --- a/gcc/cgraphclones.cc
> +++ b/gcc/cgraphclones.cc
> @@ -78,6 +78,7 @@ along with GCC; see the file COPYING3. If not see
> #include "tree-eh.h"
> #include "tree-cfg.h"
> #include "tree-inline.h"
> +#include "attribs.h"
> #include "dumpfile.h"
> #include "gimple-pretty-print.h"
> #include "alloc-pool.h"
> @@ -1048,7 +1049,17 @@ cgraph_node::create_version_clone_with_body
> location_t saved_loc = input_location;
> tree v = TREE_VALUE (target_attributes);
> input_location = DECL_SOURCE_LOCATION (new_decl);
> - bool r = targetm.target_option.valid_attribute_p (new_decl, NULL, v, 1);
> + bool r;
> + tree name_id = get_attribute_name (target_attributes);
> + const char *name_str = IDENTIFIER_POINTER (name_id);
> + if (strcmp (name_str, "target") == 0)
> + r = targetm.target_option.valid_attribute_p (new_decl, name_id, v, 1);
> + else if (strcmp (name_str, "target_version") == 0)
> + r = targetm.target_option.valid_version_attribute_p (new_decl, name_id,
> + v, 1);
> + else
> + gcc_unreachable();
> +
> input_location = saved_loc;
> if (!r)
> return NULL;
> diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc
> index 9e666e5eecee07ae7c742c3a2b27e85899945c4e..e607aa14d284d545d122e04b0eae1247fd301882 100644
> --- a/gcc/cp/decl2.cc
> +++ b/gcc/cp/decl2.cc
> @@ -832,8 +832,8 @@ check_classfn (tree ctype, tree function, tree template_parms)
> tree c2 = get_constraints (fndecl);
>
> /* While finding a match, same types and params are not enough
> - if the function is versioned. Also check version ("target")
> - attributes. */
> + if the function is versioned. Also check for different target
> + specific attributes. */
> if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
> TREE_TYPE (TREE_TYPE (fndecl)))
> && compparms (p1, p2)
> diff --git a/gcc/d/d-attribs.cc b/gcc/d/d-attribs.cc
> index c0dc0e24ded871c136e54e5527e901d16cfa5ceb..13911c75948075a838914caca88802ac325f3107 100644
> --- a/gcc/d/d-attribs.cc
> +++ b/gcc/d/d-attribs.cc
> @@ -128,14 +128,16 @@ static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
>
> static const struct attribute_spec::exclusions attr_target_exclusions[] =
> {
> - ATTR_EXCL ("target_clones", true, true, true),
> + ATTR_EXCL ("target_clones", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
> + TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
> ATTR_EXCL (NULL, false, false, false),
> };
>
> static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
> {
> ATTR_EXCL ("always_inline", true, true, true),
> - ATTR_EXCL ("target", true, true, true),
> + ATTR_EXCL ("target", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
> + TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
> ATTR_EXCL (NULL, false, false, false),
> };
>
> diff --git a/gcc/defaults.h b/gcc/defaults.h
> index dc6f09cacae8a85873c6d6685eea91fb749cc367..6f0959694102ca28fd993aaff7ec3f5d09334c39 100644
> --- a/gcc/defaults.h
> +++ b/gcc/defaults.h
> @@ -877,6 +877,16 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
> #endif
> #endif
>
> +/* Indicate whether the target uses "target" attributes for function
> + multiversioning. This is used to choose between the "target" and
> + "target_version" attributes when expanding a "target_clones" attribute, and
> + determine whether the "target" and "target_clones" attributes are mutually
> + exclusive. */
> +#ifndef TARGET_HAS_FMV_TARGET_ATTRIBUTE
> +#define TARGET_HAS_FMV_TARGET_ATTRIBUTE 1
> +#endif
> +
> +
> /* Select a format to encode pointers in exception handling data. We
> prefer those that result in fewer dynamic relocations. Assume no
> special support here and encode direct references. */
> diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
> index c0f949b538c04b3f409217e0508967dfca131604..1dc1b0523decff48f895703303a72fd93202bf7c 100644
> --- a/gcc/doc/tm.texi
> +++ b/gcc/doc/tm.texi
> @@ -10650,6 +10650,18 @@ the function declaration to hold a pointer to a target-specific
> @code{struct cl_target_option} structure.
> @end deftypefn
>
> +@deftypefn {Target Hook} bool TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P (tree @var{fndecl}, tree @var{name}, tree @var{args}, int @var{flags})
> +This hook is called to parse @code{attribute(target_version("..."))},
> +which allows setting target-specific options on individual function versions.
> +These function-specific options may differ
> +from the options specified on the command line. The hook should return
> +@code{true} if the options are valid.
> +
> +The hook should set the @code{DECL_FUNCTION_SPECIFIC_TARGET} field in
> +the function declaration to hold a pointer to a target-specific
> +@code{struct cl_target_option} structure.
> +@end deftypefn
> +
> @deftypefn {Target Hook} void TARGET_OPTION_SAVE (struct cl_target_option *@var{ptr}, struct gcc_options *@var{opts}, struct gcc_options *@var{opts_set})
> This hook is called to save any additional target-specific information
> in the @code{struct cl_target_option} structure for function-specific
> diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
> index ef04c89d7b6fd27332f09ba844c11d4bbcf3bbe0..c452108ad54a7828762f17a864f700d1682a3964 100644
> --- a/gcc/doc/tm.texi.in
> +++ b/gcc/doc/tm.texi.in
> @@ -7031,6 +7031,8 @@ on this implementation detail.
>
> @hook TARGET_OPTION_VALID_ATTRIBUTE_P
>
> +@hook TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P
> +
> @hook TARGET_OPTION_SAVE
>
> @hook TARGET_OPTION_RESTORE
> diff --git a/gcc/multiple_target.cc b/gcc/multiple_target.cc
> index a2ed048d7dd28ec470953fcd8a0dc86817e4b7dc..a832d1e8ff83d99acd7579c276b083141102f3e1 100644
> --- a/gcc/multiple_target.cc
> +++ b/gcc/multiple_target.cc
> @@ -66,10 +66,6 @@ create_dispatcher_calls (struct cgraph_node *node)
> {
> ipa_ref *ref;
>
> - if (!DECL_FUNCTION_VERSIONED (node->decl)
> - || !is_function_default_version (node->decl))
> - return;
> -
> if (!targetm.has_ifunc_p ())
> {
> error_at (DECL_SOURCE_LOCATION (node->decl),
> @@ -377,6 +373,8 @@ expand_target_clones (struct cgraph_node *node, bool definition)
> return false;
> }
>
> + const char *new_attr_name = (TARGET_HAS_FMV_TARGET_ATTRIBUTE
> + ? "target" : "target_version");
> cgraph_function_version_info *decl1_v = NULL;
> cgraph_function_version_info *decl2_v = NULL;
> cgraph_function_version_info *before = NULL;
> @@ -392,7 +390,7 @@ expand_target_clones (struct cgraph_node *node, bool definition)
> char *attr = attrs[i];
>
> /* Create new target clone. */
> - tree attributes = make_attribute ("target", attr,
> + tree attributes = make_attribute (new_attr_name, attr,
> DECL_ATTRIBUTES (node->decl));
>
> char *suffix = XNEWVEC (char, strlen (attr) + 1);
> @@ -430,7 +428,7 @@ expand_target_clones (struct cgraph_node *node, bool definition)
> XDELETEVEC (attr_str);
>
> /* Setting new attribute to initial function. */
> - tree attributes = make_attribute ("target", "default",
> + tree attributes = make_attribute (new_attr_name, "default",
> DECL_ATTRIBUTES (node->decl));
> DECL_ATTRIBUTES (node->decl) = attributes;
> node->local = false;
> diff --git a/gcc/target.def b/gcc/target.def
> index eae7959cdccbfe669d234afe45c39545eae64234..ccdd3c56f5a9d74a14899ba60ac5c41de6bc192d 100644
> --- a/gcc/target.def
> +++ b/gcc/target.def
> @@ -6540,6 +6540,23 @@ the function declaration to hold a pointer to a target-specific\n\
> bool, (tree fndecl, tree name, tree args, int flags),
> default_target_option_valid_attribute_p)
>
> +/* Function to validate the attribute((target_version(...))) strings. If
> + the option is validated, the hook should also fill in
> + DECL_FUNCTION_SPECIFIC_TARGET in the function decl node. */
> +DEFHOOK
> +(valid_version_attribute_p,
> + "This hook is called to parse @code{attribute(target_version(\"...\"))},\n\
> +which allows setting target-specific options on individual function versions.\n\
> +These function-specific options may differ\n\
> +from the options specified on the command line. The hook should return\n\
> +@code{true} if the options are valid.\n\
> +\n\
> +The hook should set the @code{DECL_FUNCTION_SPECIFIC_TARGET} field in\n\
> +the function declaration to hold a pointer to a target-specific\n\
> +@code{struct cl_target_option} structure.",
> + bool, (tree fndecl, tree name, tree args, int flags),
> + default_target_option_valid_version_attribute_p)
> +
> /* Function to save any extra target state in the target options structure. */
> DEFHOOK
> (save,
> diff --git a/gcc/targhooks.h b/gcc/targhooks.h
> index 26695abe41e46d4d73402734c15892cfef6cf829..9e76326166c39a381ef3c9fbb9300d1523d9bb47 100644
> --- a/gcc/targhooks.h
> +++ b/gcc/targhooks.h
> @@ -192,6 +192,7 @@ extern bool default_hard_regno_scratch_ok (unsigned int);
> extern bool default_mode_dependent_address_p (const_rtx, addr_space_t);
> extern bool default_new_address_profitable_p (rtx, rtx_insn *, rtx);
> extern bool default_target_option_valid_attribute_p (tree, tree, tree, int);
> +extern bool default_target_option_valid_version_attribute_p (tree, tree, tree, int);
> extern bool default_target_option_pragma_parse (tree, tree);
> extern bool default_target_can_inline_p (tree, tree);
> extern bool default_update_ipa_fn_target_info (unsigned int &, const gimple *);
> diff --git a/gcc/targhooks.cc b/gcc/targhooks.cc
> index a2dc7331c24d100405434ec670678fcacadaee9b..aabba67787fbe91ae5f5dc50d7c2a29c410944a7 100644
> --- a/gcc/targhooks.cc
> +++ b/gcc/targhooks.cc
> @@ -1789,7 +1789,19 @@ default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
> int ARG_UNUSED (flags))
> {
> warning (OPT_Wattributes,
> - "target attribute is not supported on this machine");
> + "%<target%> attribute is not supported on this machine");
> +
> + return false;
> +}
> +
> +bool
> +default_target_option_valid_version_attribute_p (tree ARG_UNUSED (fndecl),
> + tree ARG_UNUSED (name),
> + tree ARG_UNUSED (args),
> + int ARG_UNUSED (flags))
> +{
> + warning (OPT_Wattributes,
> + "%<target_version%> attribute is not supported on this machine");
>
> return false;
> }
> diff --git a/gcc/tree.h b/gcc/tree.h
> index 086b55f0375435d53a1604b6659da4f19fce3d17..d7841af19b20b0dc0ae28b433d5150e9c4763eff 100644
> --- a/gcc/tree.h
> +++ b/gcc/tree.h
> @@ -3500,8 +3500,8 @@ extern vec<tree, va_gc> **decl_debug_args_insert (tree);
> (FUNCTION_DECL_CHECK (NODE)->function_decl.function_specific_optimization)
>
> /* In FUNCTION_DECL, this is set if this function has other versions generated
> - using "target" attributes. The default version is the one which does not
> - have any "target" attribute set. */
> + to support different architecture feature sets, e.g. using "target" or
> + "target_version" attributes. */
> #define DECL_FUNCTION_VERSIONED(NODE)\
> (FUNCTION_DECL_CHECK (NODE)->function_decl.versioned_function)
>
^ permalink raw reply [flat|nested] 11+ messages in thread
* [committed v4 4/5] Add support for target_version attribute
2023-12-14 14:58 ` Richard Sandiford
@ 2023-12-16 0:45 ` Andrew Carlotti
0 siblings, 0 replies; 11+ messages in thread
From: Andrew Carlotti @ 2023-12-16 0:45 UTC (permalink / raw)
To: gcc-patches; +Cc: Richard Sandiford
This patch adds support for the "target_version" attribute to the middle
end and the C++ frontend, which will be used to implement function
multiversioning in the aarch64 backend.
On targets that don't use the "target" attribute for multiversioning,
there is no conflict between the "target" and "target_clones"
attributes. This patch therefore makes the mutual exclusion in
C-family, D and Ada conditonal upon the value of the
expanded_clones_attribute target hook.
The "target_version" attribute is only added to C++ in this patch,
because this is currently the only frontend which supports
multiversioning using the "target" attribute. Support for the
"target_version" attribute will be extended to C at a later date.
Targets that currently use the "target" attribute for function
multiversioning (i.e. i386 and rs6000) are not affected by this patch.
Committed as approved with adjustments to comments in c-attribs.
gcc/ChangeLog:
* attribs.cc (decl_attributes): Pass attribute name to target.
(is_function_default_version): Update comment to specify
incompatibility with target_version attributes.
* cgraphclones.cc (cgraph_node::create_version_clone_with_body):
Call valid_version_attribute_p for target_version attributes.
* defaults.h (TARGET_HAS_FMV_TARGET_ATTRIBUTE): New macro.
* target.def (valid_version_attribute_p): New hook.
* doc/tm.texi.in: Add new hook.
* doc/tm.texi: Regenerate.
* multiple_target.cc (create_dispatcher_calls): Remove redundant
is_function_default_version check.
(expand_target_clones): Use target macro to pick attribute name.
* targhooks.cc (default_target_option_valid_version_attribute_p):
New.
* targhooks.h (default_target_option_valid_version_attribute_p):
New.
* tree.h (DECL_FUNCTION_VERSIONED): Update comment to include
target_version attributes.
gcc/c-family/ChangeLog:
* c-attribs.cc (attr_target_exclusions): Make
target/target_clones exclusion target-dependent.
(attr_target_clones_exclusions): Ditto, and add target_version.
(attr_target_version_exclusions): New.
(c_common_attribute_table): Add target_version.
(handle_target_version_attribute): New.
(handle_target_attribute): Amend comment.
(handle_target_clones_attribute): Ditto.
gcc/ada/ChangeLog:
* gcc-interface/utils.cc (attr_target_exclusions): Make
target/target_clones exclusion target-dependent.
(attr_target_clones_exclusions): Ditto.
gcc/d/ChangeLog:
* d-attribs.cc (attr_target_exclusions): Make
target/target_clones exclusion target-dependent.
(attr_target_clones_exclusions): Ditto.
gcc/cp/ChangeLog:
* decl2.cc (check_classfn): Update comment to include
target_version attributes.
diff --git a/gcc/ada/gcc-interface/utils.cc b/gcc/ada/gcc-interface/utils.cc
index 3eabbec6bd34116910a0589b4ebf269b916cc607..17f6afd687d1dbd7648d52d86417414b04c0d896 100644
--- a/gcc/ada/gcc-interface/utils.cc
+++ b/gcc/ada/gcc-interface/utils.cc
@@ -146,14 +146,16 @@ static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
static const struct attribute_spec::exclusions attr_target_exclusions[] =
{
- { "target_clones", true, true, true },
+ { "target_clones", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE },
{ NULL, false, false, false },
};
static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
{
{ "always_inline", true, true, true },
- { "target", true, true, true },
+ { "target", TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE },
{ NULL, false, false, false },
};
diff --git a/gcc/attribs.cc b/gcc/attribs.cc
index 4e313d38f0f0608991c3267f55f43e3f0dd9d74a..0ca2779788569b7a02a79eab4db558df112aff87 100644
--- a/gcc/attribs.cc
+++ b/gcc/attribs.cc
@@ -675,7 +675,8 @@ decl_attributes (tree *node, tree attributes, int flags,
options to the attribute((target(...))) list. */
if (TREE_CODE (*node) == FUNCTION_DECL
&& current_target_pragma
- && targetm.target_option.valid_attribute_p (*node, NULL_TREE,
+ && targetm.target_option.valid_attribute_p (*node,
+ get_identifier ("target"),
current_target_pragma, 0))
{
tree cur_attr = lookup_attribute ("target", attributes);
@@ -1276,8 +1277,9 @@ make_dispatcher_decl (const tree decl)
return func_decl;
}
-/* Returns true if decl is multi-versioned and DECL is the default function,
- that is it is not tagged with target specific optimization. */
+/* Returns true if DECL is multi-versioned using the target attribute, and this
+ is the default version. This function can only be used for targets that do
+ not support the "target_version" attribute. */
bool
is_function_default_version (const tree decl)
diff --git a/gcc/c-family/c-attribs.cc b/gcc/c-family/c-attribs.cc
index 9638848591fc82d3f7116cadf38b11237206ac0b..169c96a1397fce15365c1630767331392208f758 100644
--- a/gcc/c-family/c-attribs.cc
+++ b/gcc/c-family/c-attribs.cc
@@ -151,6 +151,7 @@ static tree handle_alloc_align_attribute (tree *, tree, tree, int, bool *);
static tree handle_assume_aligned_attribute (tree *, tree, tree, int, bool *);
static tree handle_assume_attribute (tree *, tree, tree, int, bool *);
static tree handle_target_attribute (tree *, tree, tree, int, bool *);
+static tree handle_target_version_attribute (tree *, tree, tree, int, bool *);
static tree handle_target_clones_attribute (tree *, tree, tree, int, bool *);
static tree handle_optimize_attribute (tree *, tree, tree, int, bool *);
static tree ignore_attribute (tree *, tree, tree, int, bool *);
@@ -233,14 +234,23 @@ static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
static const struct attribute_spec::exclusions attr_target_exclusions[] =
{
- ATTR_EXCL ("target_clones", true, true, true),
+ ATTR_EXCL ("target_clones", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
ATTR_EXCL (NULL, false, false, false),
};
static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
{
ATTR_EXCL ("always_inline", true, true, true),
- ATTR_EXCL ("target", true, true, true),
+ ATTR_EXCL ("target", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
+ ATTR_EXCL ("target_version", true, true, true),
+ ATTR_EXCL (NULL, false, false, false),
+};
+
+static const struct attribute_spec::exclusions attr_target_version_exclusions[] =
+{
+ ATTR_EXCL ("target_clones", true, true, true),
ATTR_EXCL (NULL, false, false, false),
};
@@ -512,6 +522,9 @@ const struct attribute_spec c_common_gnu_attributes[] =
{ "target", 1, -1, true, false, false, false,
handle_target_attribute,
attr_target_exclusions },
+ { "target_version", 1, 1, true, false, false, false,
+ handle_target_version_attribute,
+ attr_target_version_exclusions },
{ "target_clones", 1, -1, true, false, false, false,
handle_target_clones_attribute,
attr_target_clones_exclusions },
@@ -5830,7 +5843,7 @@ static tree
handle_target_attribute (tree *node, tree name, tree args, int flags,
bool *no_add_attrs)
{
- /* Ensure we have a function type. */
+ /* Ensure we have a function declaration. */
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
@@ -5856,13 +5869,32 @@ handle_target_attribute (tree *node, tree name, tree args, int flags,
return NULL_TREE;
}
+/* Handle a "target_version" attribute. */
+
+static tree
+handle_target_version_attribute (tree *node, tree name, tree args, int flags,
+ bool *no_add_attrs)
+{
+ /* Ensure we have a function declaration. */
+ if (TREE_CODE (*node) != FUNCTION_DECL)
+ {
+ warning (OPT_Wattributes, "%qE attribute ignored", name);
+ *no_add_attrs = true;
+ }
+ else if (!targetm.target_option.valid_version_attribute_p (*node, name, args,
+ flags))
+ *no_add_attrs = true;
+
+ return NULL_TREE;
+}
+
/* Handle a "target_clones" attribute. */
static tree
handle_target_clones_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
- /* Ensure we have a function type. */
+ /* Ensure we have a function declaration. */
if (TREE_CODE (*node) == FUNCTION_DECL)
{
for (tree t = args; t != NULL_TREE; t = TREE_CHAIN (t))
diff --git a/gcc/cgraphclones.cc b/gcc/cgraphclones.cc
index 29d28ef895a73a223695cbb86aafbc845bbe7688..3ba5a4a2dd9fd4b7206d95f01c990818d0440334 100644
--- a/gcc/cgraphclones.cc
+++ b/gcc/cgraphclones.cc
@@ -78,6 +78,7 @@ along with GCC; see the file COPYING3. If not see
#include "tree-eh.h"
#include "tree-cfg.h"
#include "tree-inline.h"
+#include "attribs.h"
#include "dumpfile.h"
#include "gimple-pretty-print.h"
#include "alloc-pool.h"
@@ -1048,7 +1049,17 @@ cgraph_node::create_version_clone_with_body
location_t saved_loc = input_location;
tree v = TREE_VALUE (target_attributes);
input_location = DECL_SOURCE_LOCATION (new_decl);
- bool r = targetm.target_option.valid_attribute_p (new_decl, NULL, v, 1);
+ bool r;
+ tree name_id = get_attribute_name (target_attributes);
+ const char *name_str = IDENTIFIER_POINTER (name_id);
+ if (strcmp (name_str, "target") == 0)
+ r = targetm.target_option.valid_attribute_p (new_decl, name_id, v, 1);
+ else if (strcmp (name_str, "target_version") == 0)
+ r = targetm.target_option.valid_version_attribute_p (new_decl, name_id,
+ v, 1);
+ else
+ gcc_unreachable();
+
input_location = saved_loc;
if (!r)
return NULL;
diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc
index bee84879023f30145f4bbb5e0ace8fce871cd919..0850d3f5bce5d0db3f60f375c3da93d71b4587e3 100644
--- a/gcc/cp/decl2.cc
+++ b/gcc/cp/decl2.cc
@@ -834,8 +834,8 @@ check_classfn (tree ctype, tree function, tree template_parms)
tree c2 = get_constraints (fndecl);
/* While finding a match, same types and params are not enough
- if the function is versioned. Also check version ("target")
- attributes. */
+ if the function is versioned. Also check for different target
+ specific attributes. */
if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
TREE_TYPE (TREE_TYPE (fndecl)))
&& compparms (p1, p2)
diff --git a/gcc/d/d-attribs.cc b/gcc/d/d-attribs.cc
index 3b69c530c1d29f880b7dcdd5b6e9188f07e4c2e8..52f3b27baa91dbf68d94dca5c3adaaaa32117a67 100644
--- a/gcc/d/d-attribs.cc
+++ b/gcc/d/d-attribs.cc
@@ -128,14 +128,16 @@ static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
static const struct attribute_spec::exclusions attr_target_exclusions[] =
{
- ATTR_EXCL ("target_clones", true, true, true),
+ ATTR_EXCL ("target_clones", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
ATTR_EXCL (NULL, false, false, false),
};
static const struct attribute_spec::exclusions attr_target_clones_exclusions[] =
{
ATTR_EXCL ("always_inline", true, true, true),
- ATTR_EXCL ("target", true, true, true),
+ ATTR_EXCL ("target", TARGET_HAS_FMV_TARGET_ATTRIBUTE,
+ TARGET_HAS_FMV_TARGET_ATTRIBUTE, TARGET_HAS_FMV_TARGET_ATTRIBUTE),
ATTR_EXCL (NULL, false, false, false),
};
diff --git a/gcc/defaults.h b/gcc/defaults.h
index dc6f09cacae8a85873c6d6685eea91fb749cc367..6f0959694102ca28fd993aaff7ec3f5d09334c39 100644
--- a/gcc/defaults.h
+++ b/gcc/defaults.h
@@ -877,6 +877,16 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#endif
#endif
+/* Indicate whether the target uses "target" attributes for function
+ multiversioning. This is used to choose between the "target" and
+ "target_version" attributes when expanding a "target_clones" attribute, and
+ determine whether the "target" and "target_clones" attributes are mutually
+ exclusive. */
+#ifndef TARGET_HAS_FMV_TARGET_ATTRIBUTE
+#define TARGET_HAS_FMV_TARGET_ATTRIBUTE 1
+#endif
+
+
/* Select a format to encode pointers in exception handling data. We
prefer those that result in fewer dynamic relocations. Assume no
special support here and encode direct references. */
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 0bb6da080f8492629537b6c0160674edb425de9c..22a1bebc0f432497d59318ca9ca6a7d9da528d2e 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -10741,6 +10741,18 @@ the function declaration to hold a pointer to a target-specific
@code{struct cl_target_option} structure.
@end deftypefn
+@deftypefn {Target Hook} bool TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P (tree @var{fndecl}, tree @var{name}, tree @var{args}, int @var{flags})
+This hook is called to parse @code{attribute(target_version("..."))},
+which allows setting target-specific options on individual function versions.
+These function-specific options may differ
+from the options specified on the command line. The hook should return
+@code{true} if the options are valid.
+
+The hook should set the @code{DECL_FUNCTION_SPECIFIC_TARGET} field in
+the function declaration to hold a pointer to a target-specific
+@code{struct cl_target_option} structure.
+@end deftypefn
+
@deftypefn {Target Hook} void TARGET_OPTION_SAVE (struct cl_target_option *@var{ptr}, struct gcc_options *@var{opts}, struct gcc_options *@var{opts_set})
This hook is called to save any additional target-specific information
in the @code{struct cl_target_option} structure for function-specific
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index 4fe0805394ea4d45dfa6ffb41eb052fd32649a0d..f92cb7678784613e1d192c0eb12e1cf67084f16e 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -7066,6 +7066,8 @@ on this implementation detail.
@hook TARGET_OPTION_VALID_ATTRIBUTE_P
+@hook TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P
+
@hook TARGET_OPTION_SAVE
@hook TARGET_OPTION_RESTORE
diff --git a/gcc/multiple_target.cc b/gcc/multiple_target.cc
index a2ed048d7dd28ec470953fcd8a0dc86817e4b7dc..a832d1e8ff83d99acd7579c276b083141102f3e1 100644
--- a/gcc/multiple_target.cc
+++ b/gcc/multiple_target.cc
@@ -66,10 +66,6 @@ create_dispatcher_calls (struct cgraph_node *node)
{
ipa_ref *ref;
- if (!DECL_FUNCTION_VERSIONED (node->decl)
- || !is_function_default_version (node->decl))
- return;
-
if (!targetm.has_ifunc_p ())
{
error_at (DECL_SOURCE_LOCATION (node->decl),
@@ -377,6 +373,8 @@ expand_target_clones (struct cgraph_node *node, bool definition)
return false;
}
+ const char *new_attr_name = (TARGET_HAS_FMV_TARGET_ATTRIBUTE
+ ? "target" : "target_version");
cgraph_function_version_info *decl1_v = NULL;
cgraph_function_version_info *decl2_v = NULL;
cgraph_function_version_info *before = NULL;
@@ -392,7 +390,7 @@ expand_target_clones (struct cgraph_node *node, bool definition)
char *attr = attrs[i];
/* Create new target clone. */
- tree attributes = make_attribute ("target", attr,
+ tree attributes = make_attribute (new_attr_name, attr,
DECL_ATTRIBUTES (node->decl));
char *suffix = XNEWVEC (char, strlen (attr) + 1);
@@ -430,7 +428,7 @@ expand_target_clones (struct cgraph_node *node, bool definition)
XDELETEVEC (attr_str);
/* Setting new attribute to initial function. */
- tree attributes = make_attribute ("target", "default",
+ tree attributes = make_attribute (new_attr_name, "default",
DECL_ATTRIBUTES (node->decl));
DECL_ATTRIBUTES (node->decl) = attributes;
node->local = false;
diff --git a/gcc/target.def b/gcc/target.def
index ca030abab6c6694ded178a62dbc4e1dbd20540ca..0509e07d6b80bc2fddcb12ccfd3d5bcb7eb16d57 100644
--- a/gcc/target.def
+++ b/gcc/target.def
@@ -6635,6 +6635,23 @@ the function declaration to hold a pointer to a target-specific\n\
bool, (tree fndecl, tree name, tree args, int flags),
default_target_option_valid_attribute_p)
+/* Function to validate the attribute((target_version(...))) strings. If
+ the option is validated, the hook should also fill in
+ DECL_FUNCTION_SPECIFIC_TARGET in the function decl node. */
+DEFHOOK
+(valid_version_attribute_p,
+ "This hook is called to parse @code{attribute(target_version(\"...\"))},\n\
+which allows setting target-specific options on individual function versions.\n\
+These function-specific options may differ\n\
+from the options specified on the command line. The hook should return\n\
+@code{true} if the options are valid.\n\
+\n\
+The hook should set the @code{DECL_FUNCTION_SPECIFIC_TARGET} field in\n\
+the function declaration to hold a pointer to a target-specific\n\
+@code{struct cl_target_option} structure.",
+ bool, (tree fndecl, tree name, tree args, int flags),
+ default_target_option_valid_version_attribute_p)
+
/* Function to save any extra target state in the target options structure. */
DEFHOOK
(save,
diff --git a/gcc/targhooks.h b/gcc/targhooks.h
index 5a39e8e6d540714678f912340fb35b65e88757a2..7996cb4433662d5fd76c0eeef2e146802ca9d055 100644
--- a/gcc/targhooks.h
+++ b/gcc/targhooks.h
@@ -193,6 +193,7 @@ extern bool default_hard_regno_scratch_ok (unsigned int);
extern bool default_mode_dependent_address_p (const_rtx, addr_space_t);
extern bool default_new_address_profitable_p (rtx, rtx_insn *, rtx);
extern bool default_target_option_valid_attribute_p (tree, tree, tree, int);
+extern bool default_target_option_valid_version_attribute_p (tree, tree, tree, int);
extern bool default_target_option_pragma_parse (tree, tree);
extern bool default_target_can_inline_p (tree, tree);
extern bool default_update_ipa_fn_target_info (unsigned int &, const gimple *);
diff --git a/gcc/targhooks.cc b/gcc/targhooks.cc
index afe91fe1d17a2dd263a6864bd15bc61c08954b36..1cc0895ceab4b431aebcec9bbebc79cd68af2696 100644
--- a/gcc/targhooks.cc
+++ b/gcc/targhooks.cc
@@ -1799,7 +1799,19 @@ default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
int ARG_UNUSED (flags))
{
warning (OPT_Wattributes,
- "target attribute is not supported on this machine");
+ "%<target%> attribute is not supported on this machine");
+
+ return false;
+}
+
+bool
+default_target_option_valid_version_attribute_p (tree ARG_UNUSED (fndecl),
+ tree ARG_UNUSED (name),
+ tree ARG_UNUSED (args),
+ int ARG_UNUSED (flags))
+{
+ warning (OPT_Wattributes,
+ "%<target_version%> attribute is not supported on this machine");
return false;
}
diff --git a/gcc/tree.h b/gcc/tree.h
index cec9f6c54a7a53148e5114140356a6a94b6e9746..4829f84c975f7f4e75fb7937a7338e3d9323a50e 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -3510,8 +3510,8 @@ extern vec<tree, va_gc> **decl_debug_args_insert (tree);
(FUNCTION_DECL_CHECK (NODE)->function_decl.function_specific_optimization)
/* In FUNCTION_DECL, this is set if this function has other versions generated
- using "target" attributes. The default version is the one which does not
- have any "target" attribute set. */
+ to support different architecture feature sets, e.g. using "target" or
+ "target_version" attributes. */
#define DECL_FUNCTION_VERSIONED(NODE)\
(FUNCTION_DECL_CHECK (NODE)->function_decl.versioned_function)
^ permalink raw reply [flat|nested] 11+ messages in thread
* [committed v4 5/5] aarch64: Add function multiversioning support
2023-12-14 14:02 ` Richard Sandiford
@ 2023-12-16 0:47 ` Andrew Carlotti
2023-12-16 4:03 ` Ramana Radhakrishnan
0 siblings, 1 reply; 11+ messages in thread
From: Andrew Carlotti @ 2023-12-16 0:47 UTC (permalink / raw)
To: gcc-patches; +Cc: Richard Sandiford
This adds initial support for function multiversioning on aarch64 using
the target_version and target_clones attributes. This loosely follows
the Beta specification in the ACLE [1], although with some differences
that still need to be resolved (possibly as follow-up patches).
Existing function multiversioning implementations are broken in various
ways when used across translation units. This includes placing
resolvers in the wrong translation units, and using symbol mangling that
callers to unintentionally bypass the resolver in some circumstances.
Fixing these issues for aarch64 will require modifications to our ACLE
specification. It will also require further adjustments to existing
middle end code, to facilitate different mangling and resolver
placement while preserving existing target behaviours.
The list of function multiversioning features specified in the ACLE is
also inconsistent with the list of features supported in target option
extensions. I intend to resolve some or all of these inconsistencies at
a later stage.
The target_version attribute is currently only supported in C++, since
this is the only frontend with existing support for multiversioning
using the target attribute. On the other hand, this patch happens to
enable multiversioning with the target_clones attribute in Ada and D, as
well as the entire C family, using their existing frontend support.
This patch also does not support the following aspects of the Beta
specification:
- The target_clones attribute should allow an implicit unlisted
"default" version.
- There should be an option to disable function multiversioning at
compile time.
- Unrecognised target names in a target_clones attribute should be
ignored (with an optional warning). This current patch raises an
error instead.
[1] https://github.com/ARM-software/acle/blob/main/main/acle.md#function-multi-versioning
Committed as approved with the coding convention fix, plus some adjustments to
aarch64-option-extensions.def to accommodate recent changes on master. The
series passed regression testing as a whole post-rebase on aarch64.
gcc/ChangeLog:
* config/aarch64/aarch64-feature-deps.h (fmv_deps_<FEAT_NAME>):
Define aarch64_feature_flags mask foreach FMV feature.
* config/aarch64/aarch64-option-extensions.def: Use new macros
to define FMV feature extensions.
* config/aarch64/aarch64.cc (aarch64_option_valid_attribute_p):
Check for target_version attribute after processing target
attribute.
(aarch64_fmv_feature_data): New.
(aarch64_parse_fmv_features): New.
(aarch64_process_target_version_attr): New.
(aarch64_option_valid_version_attribute_p): New.
(get_feature_mask_for_version): New.
(compare_feature_masks): New.
(aarch64_compare_version_priority): New.
(build_ifunc_arg_type): New.
(make_resolver_func): New.
(add_condition_to_bb): New.
(dispatch_function_versions): New.
(aarch64_generate_version_dispatcher_body): New.
(aarch64_get_function_versions_dispatcher): New.
(aarch64_common_function_versions): New.
(aarch64_mangle_decl_assembler_name): New.
(TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P): New implementation.
(TARGET_OPTION_EXPANDED_CLONES_ATTRIBUTE): New implementation.
(TARGET_OPTION_FUNCTION_VERSIONS): New implementation.
(TARGET_COMPARE_VERSION_PRIORITY): New implementation.
(TARGET_GENERATE_VERSION_DISPATCHER_BODY): New implementation.
(TARGET_GET_FUNCTION_VERSIONS_DISPATCHER): New implementation.
(TARGET_MANGLE_DECL_ASSEMBLER_NAME): New implementation.
* config/aarch64/aarch64.h (TARGET_HAS_FMV_TARGET_ATTRIBUTE):
Set target macro.
* config/arm/aarch-common.h (enum aarch_parse_opt_result): Add
new value to report duplicate FMV feature.
* common/config/aarch64/cpuinfo.h: New file.
libgcc/ChangeLog:
* config/aarch64/cpuinfo.c (enum CPUFeatures): Move to shared
copy in gcc/common
gcc/testsuite/ChangeLog:
* gcc.target/aarch64/options_set_17.c: Reorder expected flags.
* gcc.target/aarch64/cpunative/native_cpu_0.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_13.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_16.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_17.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_18.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_19.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_20.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_21.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_22.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_6.c: Ditto.
* gcc.target/aarch64/cpunative/native_cpu_7.c: Ditto.
diff --git a/gcc/common/config/aarch64/cpuinfo.h b/gcc/common/config/aarch64/cpuinfo.h
new file mode 100644
index 0000000000000000000000000000000000000000..1690b6eee48e960d0ae675f8e8b05e6f182b56a3
--- /dev/null
+++ b/gcc/common/config/aarch64/cpuinfo.h
@@ -0,0 +1,94 @@
+/* CPU feature detection for AArch64 architecture.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+
+ This file is part of GCC.
+
+ This file is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 3, or (at your option) any
+ later version.
+
+ This file is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ Under Section 7 of GPL version 3, you are granted additional
+ permissions described in the GCC Runtime Library Exception, version
+ 3.1, as published by the Free Software Foundation.
+
+ You should have received a copy of the GNU General Public License and
+ a copy of the GCC Runtime Library Exception along with this program;
+ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* This enum is used in libgcc feature detection, and in the function
+ multiversioning implementation in aarch64.cc. The enum should use the same
+ values as the corresponding enum in LLVM's compiler-rt, to faciliate
+ compatibility between compilers. */
+
+enum CPUFeatures {
+ FEAT_RNG,
+ FEAT_FLAGM,
+ FEAT_FLAGM2,
+ FEAT_FP16FML,
+ FEAT_DOTPROD,
+ FEAT_SM4,
+ FEAT_RDM,
+ FEAT_LSE,
+ FEAT_FP,
+ FEAT_SIMD,
+ FEAT_CRC,
+ FEAT_SHA1,
+ FEAT_SHA2,
+ FEAT_SHA3,
+ FEAT_AES,
+ FEAT_PMULL,
+ FEAT_FP16,
+ FEAT_DIT,
+ FEAT_DPB,
+ FEAT_DPB2,
+ FEAT_JSCVT,
+ FEAT_FCMA,
+ FEAT_RCPC,
+ FEAT_RCPC2,
+ FEAT_FRINTTS,
+ FEAT_DGH,
+ FEAT_I8MM,
+ FEAT_BF16,
+ FEAT_EBF16,
+ FEAT_RPRES,
+ FEAT_SVE,
+ FEAT_SVE_BF16,
+ FEAT_SVE_EBF16,
+ FEAT_SVE_I8MM,
+ FEAT_SVE_F32MM,
+ FEAT_SVE_F64MM,
+ FEAT_SVE2,
+ FEAT_SVE_AES,
+ FEAT_SVE_PMULL128,
+ FEAT_SVE_BITPERM,
+ FEAT_SVE_SHA3,
+ FEAT_SVE_SM4,
+ FEAT_SME,
+ FEAT_MEMTAG,
+ FEAT_MEMTAG2,
+ FEAT_MEMTAG3,
+ FEAT_SB,
+ FEAT_PREDRES,
+ FEAT_SSBS,
+ FEAT_SSBS2,
+ FEAT_BTI,
+ FEAT_LS64,
+ FEAT_LS64_V,
+ FEAT_LS64_ACCDATA,
+ FEAT_WFXT,
+ FEAT_SME_F64,
+ FEAT_SME_I64,
+ FEAT_SME2,
+ FEAT_RCPC3,
+ FEAT_MAX,
+ FEAT_EXT = 62, /* Reserved to indicate presence of additional features field
+ in __aarch64_cpu_features. */
+ FEAT_INIT /* Used as flag of features initialization completion. */
+};
diff --git a/gcc/config/aarch64/aarch64-feature-deps.h b/gcc/config/aarch64/aarch64-feature-deps.h
index 7b85a8860de57f6727644c03296cef192ad0990c..8f20582e1efdd4817138480bee8cdb27fa7f3dfe 100644
--- a/gcc/config/aarch64/aarch64-feature-deps.h
+++ b/gcc/config/aarch64/aarch64-feature-deps.h
@@ -115,6 +115,13 @@ get_flags_off (aarch64_feature_flags mask)
constexpr auto cpu_##CORE_IDENT = ARCH_IDENT ().enable | get_enable FEATURES;
#include "config/aarch64/aarch64-cores.def"
+/* Define fmv_deps_<NAME> variables for each FMV feature, giving the transitive
+ closure of all the features that the FMV feature enables. */
+#define AARCH64_FMV_FEATURE(A, FEAT_NAME, OPT_FLAGS) \
+ constexpr auto fmv_deps_##FEAT_NAME = get_enable OPT_FLAGS;
+#include "config/aarch64/aarch64-option-extensions.def"
+
+
}
}
diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index 5aa37ac4e0edacfeffbbf6944a19311455d49288..d8118d8579ce3b24d85063c55587c80a2ea4d5eb 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -17,17 +17,22 @@
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
-/* This is a list of ISA extentsions in AArch64.
+/* This is a list of ISA extensions in AArch64.
- Before using #include to read this file, define a macro:
+ Before using #include to read this file, define one of the following
+ macros:
AARCH64_OPT_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON,
EXPLICIT_OFF, FEATURE_STRING)
+ AARCH64_FMV_FEATURE(NAME, FEAT_NAME, IDENT)
+
- NAME is the name of the extension, represented as a string constant.
- IDENT is the canonical internal name for this flag.
+ - FEAT_NAME is the unprefixed name used in the CPUFeatures enum.
+
- REQUIRES is a list of features that must be enabled whenever this
feature is enabled. The relationship is implicitly transitive:
if A appears in B's REQUIRES and B appears in C's REQUIRES then
@@ -58,45 +63,96 @@
that are required. Their order is not important. An empty string means
do not detect this feature during auto detection.
- The list of features must follow topological order wrt REQUIRES
- and EXPLICIT_ON. For example, if A is in B's REQUIRES list, A must
- come before B. This is enforced by aarch64-feature-deps.h.
+ - OPT_FLAGS is a list of feature IDENTS that should be enabled (along with
+ their transitive dependencies) when the specified FMV feature is present.
+
+ Where a feature is present as both an extension and a function
+ multiversioning feature, and IDENT matches the FEAT_NAME suffix, then these
+ can be listed here simultaneously using the macro:
+
+ AARCH64_OPT_FMV_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON,
+ EXPLICIT_OFF, FEATURE_STRING)
+
+ The list of features extensions must follow topological order wrt REQUIRES
+ and EXPLICIT_ON. For example, if A is in B's REQUIRES list, A must come
+ before B. This is enforced by aarch64-feature-deps.h.
+
+ The list of multiversioning features must be ordered by increasing priority,
+ as defined in https://github.com/ARM-software/acle/blob/main/main/acle.md
NOTE: Any changes to the AARCH64_OPT_EXTENSION macro need to be mirrored in
config.gcc. */
+#ifndef AARCH64_OPT_EXTENSION
+#define AARCH64_OPT_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON, \
+ EXPLICIT_OFF, FEATURE_STRING)
+#endif
+
+#ifndef AARCH64_FMV_FEATURE
+#define AARCH64_FMV_FEATURE(NAME, FEAT_NAME, OPT_FLAGS)
+#endif
+
+#define AARCH64_OPT_FMV_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON, \
+ EXPLICIT_OFF, FEATURE_STRING) \
+AARCH64_OPT_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON, EXPLICIT_OFF, \
+ FEATURE_STRING) \
+AARCH64_FMV_FEATURE(NAME, IDENT, (IDENT))
+
+
AARCH64_OPT_EXTENSION("fp", FP, (), (), (), "fp")
AARCH64_OPT_EXTENSION("simd", SIMD, (FP), (), (), "asimd")
-AARCH64_OPT_EXTENSION("crc", CRC, (), (), (), "crc32")
+AARCH64_OPT_FMV_EXTENSION("rng", RNG, (), (), (), "rng")
-AARCH64_OPT_EXTENSION("lse", LSE, (), (), (), "atomics")
+AARCH64_OPT_FMV_EXTENSION("flagm", FLAGM, (), (), (), "flagm")
-/* +nofp16 disables an implicit F16FML, even though an implicit F16FML
- does not imply F16. See F16FML for more details. */
-AARCH64_OPT_EXTENSION("fp16", F16, (FP), (), (F16FML), "fphp asimdhp")
+AARCH64_FMV_FEATURE("flagm2", FLAGM2, (FLAGM))
+
+AARCH64_FMV_FEATURE("fp16fml", FP16FML, (F16FML))
+
+AARCH64_OPT_FMV_EXTENSION("dotprod", DOTPROD, (SIMD), (), (), "asimddp")
-AARCH64_OPT_EXTENSION("rcpc", RCPC, (), (), (), "lrcpc")
+AARCH64_OPT_FMV_EXTENSION("sm4", SM4, (SIMD), (), (), "sm3 sm4")
/* An explicit +rdma implies +simd, but +rdma+nosimd still enables scalar
RDMA instructions. */
AARCH64_OPT_EXTENSION("rdma", RDMA, (), (SIMD), (), "asimdrdm")
-AARCH64_OPT_EXTENSION("dotprod", DOTPROD, (SIMD), (), (), "asimddp")
+AARCH64_FMV_FEATURE("rmd", RDM, (RDMA))
+
+AARCH64_OPT_FMV_EXTENSION("lse", LSE, (), (), (), "atomics")
+
+AARCH64_FMV_FEATURE("fp", FP, (FP))
+
+AARCH64_FMV_FEATURE("simd", SIMD, (SIMD))
+
+AARCH64_OPT_FMV_EXTENSION("crc", CRC, (), (), (), "crc32")
+
+AARCH64_FMV_FEATURE("sha1", SHA1, ())
-AARCH64_OPT_EXTENSION("aes", AES, (SIMD), (), (), "aes")
+AARCH64_OPT_FMV_EXTENSION("sha2", SHA2, (SIMD), (), (), "sha1 sha2")
-AARCH64_OPT_EXTENSION("sha2", SHA2, (SIMD), (), (), "sha1 sha2")
+AARCH64_FMV_FEATURE("sha3", SHA3, (SHA3))
+
+AARCH64_OPT_FMV_EXTENSION("aes", AES, (SIMD), (), (), "aes")
+
+AARCH64_FMV_FEATURE("pmull", PMULL, ())
/* +nocrypto disables AES, SHA2 and SM4, and anything that depends on them
(such as SHA3 and the SVE2 crypto extensions). */
AARCH64_OPT_EXTENSION("crypto", CRYPTO, (AES, SHA2), (), (AES, SHA2, SM4),
"aes pmull sha1 sha2")
+/* Listing sha3 after crypto means we pass "+aes+sha3" to the assembler
+ instead of "+sha3+crypto". */
AARCH64_OPT_EXTENSION("sha3", SHA3, (SHA2), (), (), "sha3 sha512")
-AARCH64_OPT_EXTENSION("sm4", SM4, (SIMD), (), (), "sm3 sm4")
+/* +nofp16 disables an implicit F16FML, even though an implicit F16FML
+ does not imply F16. See F16FML for more details. */
+AARCH64_OPT_EXTENSION("fp16", F16, (FP), (), (F16FML), "fphp asimdhp")
+
+AARCH64_FMV_FEATURE("fp16", FP16, (F16))
/* An explicit +fp16fml implies +fp16, but a dependence on it does not.
Thus -march=armv8.4-a implies F16FML but not F16. -march=armv8.4-a+fp16
@@ -104,60 +160,120 @@ AARCH64_OPT_EXTENSION("sm4", SM4, (SIMD), (), (), "sm3 sm4")
-march=armv8.4-a+nofp16+fp16 enables F16 but not F16FML. */
AARCH64_OPT_EXTENSION("fp16fml", F16FML, (), (F16), (), "asimdfhm")
-AARCH64_OPT_EXTENSION("sve", SVE, (SIMD, F16), (), (), "sve")
+AARCH64_FMV_FEATURE("dit", DIT, ())
-AARCH64_OPT_EXTENSION("profile", PROFILE, (), (), (), "")
+AARCH64_FMV_FEATURE("dpb", DPB, ())
-AARCH64_OPT_EXTENSION("rng", RNG, (), (), (), "rng")
+AARCH64_FMV_FEATURE("dpb2", DPB2, ())
-AARCH64_OPT_EXTENSION("memtag", MEMTAG, (), (), (), "")
+AARCH64_FMV_FEATURE("jscvt", JSCVT, ())
-AARCH64_OPT_EXTENSION("sb", SB, (), (), (), "sb")
+AARCH64_FMV_FEATURE("fcma", FCMA, (SIMD))
-AARCH64_OPT_EXTENSION("ssbs", SSBS, (), (), (), "ssbs")
+AARCH64_OPT_FMV_EXTENSION("rcpc", RCPC, (), (), (), "lrcpc")
-AARCH64_OPT_EXTENSION("predres", PREDRES, (), (), (), "")
+AARCH64_FMV_FEATURE("rcpc2", RCPC2, (RCPC))
-AARCH64_OPT_EXTENSION("sve2", SVE2, (SVE), (), (), "sve2")
+AARCH64_OPT_FMV_EXTENSION("rcpc3", RCPC3, (), (), (), "rcpc3")
-AARCH64_OPT_EXTENSION("sve2-sm4", SVE2_SM4, (SVE2, SM4), (), (), "svesm4")
+AARCH64_FMV_FEATURE("frintts", FRINTTS, ())
+
+AARCH64_FMV_FEATURE("dgh", DGH, ())
+
+AARCH64_OPT_FMV_EXTENSION("i8mm", I8MM, (SIMD), (), (), "i8mm")
+
+/* An explicit +bf16 implies +simd, but +bf16+nosimd still enables scalar BF16
+ instructions. */
+AARCH64_OPT_FMV_EXTENSION("bf16", BF16, (FP), (SIMD), (), "bf16")
+
+AARCH64_FMV_FEATURE("ebf16", EBF16, (BF16))
+
+AARCH64_FMV_FEATURE("rpres", RPRES, ())
+
+AARCH64_OPT_FMV_EXTENSION("sve", SVE, (SIMD, F16), (), (), "sve")
+
+AARCH64_FMV_FEATURE("sve-bf16", SVE_BF16, (SVE, BF16))
+
+AARCH64_FMV_FEATURE("sve-ebf16", SVE_EBF16, (SVE, BF16))
+
+AARCH64_FMV_FEATURE("sve-i8mm", SVE_I8MM, (SVE, I8MM))
+
+AARCH64_OPT_EXTENSION("f32mm", F32MM, (SVE), (), (), "f32mm")
+
+AARCH64_FMV_FEATURE("f32mm", SVE_F32MM, (F32MM))
+
+AARCH64_OPT_EXTENSION("f64mm", F64MM, (SVE), (), (), "f64mm")
+
+AARCH64_FMV_FEATURE("f64mm", SVE_F64MM, (F64MM))
+
+AARCH64_OPT_FMV_EXTENSION("sve2", SVE2, (SVE), (), (), "sve2")
AARCH64_OPT_EXTENSION("sve2-aes", SVE2_AES, (SVE2, AES), (), (), "sveaes")
-AARCH64_OPT_EXTENSION("sve2-sha3", SVE2_SHA3, (SVE2, SHA3), (), (), "svesha3")
+AARCH64_FMV_FEATURE("sve2-aes", SVE_AES, (SVE2_AES))
+
+AARCH64_FMV_FEATURE("sve2-pmull128", SVE_PMULL128, (SVE2))
AARCH64_OPT_EXTENSION("sve2-bitperm", SVE2_BITPERM, (SVE2), (), (),
"svebitperm")
-AARCH64_OPT_EXTENSION("tme", TME, (), (), (), "")
+AARCH64_FMV_FEATURE("sve2-bitperm", SVE_BITPERM, (SVE2_BITPERM))
-AARCH64_OPT_EXTENSION("i8mm", I8MM, (SIMD), (), (), "i8mm")
+AARCH64_OPT_EXTENSION("sve2-sha3", SVE2_SHA3, (SVE2, SHA3), (), (), "svesha3")
-AARCH64_OPT_EXTENSION("f32mm", F32MM, (SVE), (), (), "f32mm")
+AARCH64_FMV_FEATURE("sve2-sha3", SVE_SHA3, (SVE2_SHA3))
-AARCH64_OPT_EXTENSION("f64mm", F64MM, (SVE), (), (), "f64mm")
+AARCH64_OPT_EXTENSION("sve2-sm4", SVE2_SM4, (SVE2, SM4), (), (), "svesm4")
-/* An explicit +bf16 implies +simd, but +bf16+nosimd still enables scalar BF16
- instructions. */
-AARCH64_OPT_EXTENSION("bf16", BF16, (FP), (SIMD), (), "bf16")
+AARCH64_FMV_FEATURE("sve2-sm4", SVE_SM4, (SVE2_SM4))
+
+AARCH64_OPT_FMV_EXTENSION("sme", SME, (BF16, SVE2), (), (), "sme")
+
+AARCH64_OPT_FMV_EXTENSION("memtag", MEMTAG, (), (), (), "")
+
+AARCH64_FMV_FEATURE("memtag2", MEMTAG2, (MEMTAG))
+
+AARCH64_FMV_FEATURE("memtag3", MEMTAG3, (MEMTAG))
-AARCH64_OPT_EXTENSION("flagm", FLAGM, (), (), (), "flagm")
+AARCH64_OPT_FMV_EXTENSION("sb", SB, (), (), (), "sb")
+
+AARCH64_OPT_FMV_EXTENSION("predres", PREDRES, (), (), (), "")
+
+AARCH64_OPT_FMV_EXTENSION("ssbs", SSBS, (), (), (), "ssbs")
+
+AARCH64_FMV_FEATURE("ssbs2", SSBS2, (SSBS))
+
+AARCH64_FMV_FEATURE("bti", BTI, ())
+
+AARCH64_OPT_EXTENSION("profile", PROFILE, (), (), (), "")
+
+AARCH64_OPT_EXTENSION("tme", TME, (), (), (), "")
AARCH64_OPT_EXTENSION("pauth", PAUTH, (), (), (), "paca pacg")
AARCH64_OPT_EXTENSION("ls64", LS64, (), (), (), "")
-AARCH64_OPT_EXTENSION("mops", MOPS, (), (), (), "")
+AARCH64_FMV_FEATURE("ls64", LS64, ())
-AARCH64_OPT_EXTENSION("cssc", CSSC, (), (), (), "cssc")
+AARCH64_FMV_FEATURE("ls64_v", LS64_V, ())
-AARCH64_OPT_EXTENSION("sme", SME, (BF16, SVE2), (), (), "sme")
+AARCH64_FMV_FEATURE("ls64_accdata", LS64_ACCDATA, (LS64))
-AARCH64_OPT_EXTENSION("sme-i16i64", SME_I16I64, (SME), (), (), "")
+AARCH64_FMV_FEATURE("wfxt", WFXT, ())
AARCH64_OPT_EXTENSION("sme-f64f64", SME_F64F64, (SME), (), (), "")
-AARCH64_OPT_EXTENSION("sme2", SME2, (SME), (), (), "sme2")
+AARCH64_FMV_FEATURE("sme-f64f64", SME_F64, (SME_F64F64))
+
+AARCH64_OPT_EXTENSION("sme-i16i64", SME_I16I64, (SME), (), (), "")
+
+AARCH64_FMV_FEATURE("sme-i16i64", SME_I64, (SME_I16I64))
+
+AARCH64_OPT_FMV_EXTENSION("sme2", SME2, (SME), (), (), "sme2")
+
+AARCH64_OPT_EXTENSION("mops", MOPS, (), (), (), "")
+
+AARCH64_OPT_EXTENSION("cssc", CSSC, (), (), (), "cssc")
AARCH64_OPT_EXTENSION("d128", D128, (), (), (), "d128")
@@ -165,5 +281,6 @@ AARCH64_OPT_EXTENSION("the", THE, (), (), (), "the")
AARCH64_OPT_EXTENSION("gcs", GCS, (), (), (), "gcs")
-AARCH64_OPT_EXTENSION("rcpc3", RCPC3, (), (), (), "rcpc3")
+#undef AARCH64_OPT_FMV_EXTENSION
#undef AARCH64_OPT_EXTENSION
+#undef AARCH64_FMV_FEATURE
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index 501bb7478a0755fa76c488ec03dcfab6c272851c..3ae42be770400da96ea3d9d25d6e1b2d393d034d 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -1362,6 +1362,8 @@ extern enum aarch64_code_model aarch64_cmodel;
(aarch64_cmodel == AARCH64_CMODEL_TINY \
|| aarch64_cmodel == AARCH64_CMODEL_TINY_PIC)
+#define TARGET_HAS_FMV_TARGET_ATTRIBUTE 0
+
#define TARGET_SUPPORTS_WIDE_INT 1
/* Modes valid for AdvSIMD D registers, i.e. that fit in half a Q register. */
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index 190608d13810b48547e479908909a6ccd30d345a..9d130c0fd86e8026fe6997c2bd134de83337db97 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -85,6 +85,7 @@
#include "aarch64-feature-deps.h"
#include "config/arm/aarch-common.h"
#include "config/arm/aarch-common-protos.h"
+#include "common/config/aarch64/cpuinfo.h"
#include "ssa.h"
#include "except.h"
#include "tree-pass.h"
@@ -19340,6 +19341,8 @@ aarch64_process_target_attr (tree args)
return true;
}
+static bool aarch64_process_target_version_attr (tree args);
+
/* Implement TARGET_OPTION_VALID_ATTRIBUTE_P. This is used to
process attribute ((target ("..."))). */
@@ -19395,6 +19398,20 @@ aarch64_option_valid_attribute_p (tree fndecl, tree, tree args, int)
TREE_TARGET_OPTION (target_option_current_node));
ret = aarch64_process_target_attr (args);
+ ret = aarch64_process_target_attr (args);
+ if (ret)
+ {
+ tree version_attr = lookup_attribute ("target_version",
+ DECL_ATTRIBUTES (fndecl));
+ if (version_attr != NULL_TREE)
+ {
+ /* Reapply any target_version attribute after target attribute.
+ This should be equivalent to applying the target_version once
+ after processing all target attributes. */
+ tree version_args = TREE_VALUE (version_attr);
+ ret = aarch64_process_target_version_attr (version_args);
+ }
+ }
/* Set up any additional state. */
if (ret)
@@ -19425,6 +19442,829 @@ aarch64_option_valid_attribute_p (tree fndecl, tree, tree args, int)
return ret;
}
+typedef unsigned long long aarch64_fmv_feature_mask;
+
+typedef struct
+{
+ const char *name;
+ aarch64_fmv_feature_mask feature_mask;
+ aarch64_feature_flags opt_flags;
+} aarch64_fmv_feature_datum;
+
+#define AARCH64_FMV_FEATURE(NAME, FEAT_NAME, C) \
+ {NAME, 1ULL << FEAT_##FEAT_NAME, ::feature_deps::fmv_deps_##FEAT_NAME},
+
+/* FMV features are listed in priority order, to make it easier to sort target
+ strings. */
+static aarch64_fmv_feature_datum aarch64_fmv_feature_data[] = {
+#include "config/aarch64/aarch64-option-extensions.def"
+};
+
+/* Parse a function multiversioning feature string STR, as found in a
+ target_version or target_clones attribute.
+
+ If ISA_FLAGS is nonnull, then update it with the specified architecture
+ features turned on. If FEATURE_MASK is nonnull, then assign to it a bitmask
+ representing the set of features explicitly specified in the feature string.
+ Return an aarch_parse_opt_result describing the result.
+
+ When the STR string contains an invalid or duplicate extension, a copy of
+ the extension string is created and stored to INVALID_EXTENSION. */
+
+static enum aarch_parse_opt_result
+aarch64_parse_fmv_features (const char *str, aarch64_feature_flags *isa_flags,
+ aarch64_fmv_feature_mask *feature_mask,
+ std::string *invalid_extension)
+{
+ if (feature_mask)
+ *feature_mask = 0ULL;
+
+ if (strcmp (str, "default") == 0)
+ return AARCH_PARSE_OK;
+
+ while (str != NULL && *str != 0)
+ {
+ const char *ext;
+ size_t len;
+
+ ext = strchr (str, '+');
+
+ if (ext != NULL)
+ len = ext - str;
+ else
+ len = strlen (str);
+
+ if (len == 0)
+ return AARCH_PARSE_MISSING_ARG;
+
+ static const int num_features = ARRAY_SIZE (aarch64_fmv_feature_data);
+ int i;
+ for (i = 0; i < num_features; i++)
+ {
+ if (strlen (aarch64_fmv_feature_data[i].name) == len
+ && strncmp (aarch64_fmv_feature_data[i].name, str, len) == 0)
+ {
+ if (isa_flags)
+ *isa_flags |= aarch64_fmv_feature_data[i].opt_flags;
+ if (feature_mask)
+ {
+ auto old_feature_mask = *feature_mask;
+ *feature_mask |= aarch64_fmv_feature_data[i].feature_mask;
+ if (*feature_mask == old_feature_mask)
+ {
+ /* Duplicate feature. */
+ if (invalid_extension)
+ *invalid_extension = std::string (str, len);
+ return AARCH_PARSE_DUPLICATE_FEATURE;
+ }
+ }
+ break;
+ }
+ }
+
+ if (i == num_features)
+ {
+ /* Feature not found in list. */
+ if (invalid_extension)
+ *invalid_extension = std::string (str, len);
+ return AARCH_PARSE_INVALID_FEATURE;
+ }
+
+ str = ext;
+ if (str)
+ /* Skip over the next '+'. */
+ str++;
+ }
+
+ return AARCH_PARSE_OK;
+}
+
+/* Parse the tree in ARGS that contains the target_version attribute
+ information and update the global target options space. */
+
+static bool
+aarch64_process_target_version_attr (tree args)
+{
+ if (TREE_CODE (args) == TREE_LIST)
+ {
+ if (TREE_CHAIN (args))
+ {
+ error ("attribute %<target_version%> has multiple values");
+ return false;
+ }
+ args = TREE_VALUE (args);
+ }
+
+ if (!args || TREE_CODE (args) != STRING_CST)
+ {
+ error ("attribute %<target_version%> argument not a string");
+ return false;
+ }
+
+ const char *str = TREE_STRING_POINTER (args);
+
+ enum aarch_parse_opt_result parse_res;
+ auto isa_flags = aarch64_asm_isa_flags;
+
+ std::string invalid_extension;
+ parse_res = aarch64_parse_fmv_features (str, &isa_flags, NULL,
+ &invalid_extension);
+
+ if (parse_res == AARCH_PARSE_OK)
+ {
+ aarch64_set_asm_isa_flags (isa_flags);
+ return true;
+ }
+
+ switch (parse_res)
+ {
+ case AARCH_PARSE_MISSING_ARG:
+ error ("missing value in %<target_version%> attribute");
+ break;
+
+ case AARCH_PARSE_INVALID_FEATURE:
+ error ("invalid feature modifier %qs of value %qs in "
+ "%<target_version%> attribute", invalid_extension.c_str (),
+ str);
+ break;
+
+ case AARCH_PARSE_DUPLICATE_FEATURE:
+ error ("duplicate feature modifier %qs of value %qs in "
+ "%<target_version%> attribute", invalid_extension.c_str (),
+ str);
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+
+ return false;
+}
+
+/* Implement TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P. This is used to
+ process attribute ((target_version ("..."))). */
+
+static bool
+aarch64_option_valid_version_attribute_p (tree fndecl, tree, tree args, int)
+{
+ struct cl_target_option cur_target;
+ bool ret;
+ tree new_target;
+ tree existing_target = DECL_FUNCTION_SPECIFIC_TARGET (fndecl);
+
+ /* Save the current target options to restore at the end. */
+ cl_target_option_save (&cur_target, &global_options, &global_options_set);
+
+ /* If fndecl already has some target attributes applied to it, unpack
+ them so that we add this attribute on top of them, rather than
+ overwriting them. */
+ if (existing_target)
+ {
+ struct cl_target_option *existing_options
+ = TREE_TARGET_OPTION (existing_target);
+
+ if (existing_options)
+ cl_target_option_restore (&global_options, &global_options_set,
+ existing_options);
+ }
+ else
+ cl_target_option_restore (&global_options, &global_options_set,
+ TREE_TARGET_OPTION (target_option_current_node));
+
+ ret = aarch64_process_target_version_attr (args);
+
+ /* Set up any additional state. */
+ if (ret)
+ {
+ aarch64_override_options_internal (&global_options);
+ new_target = build_target_option_node (&global_options,
+ &global_options_set);
+ }
+ else
+ new_target = NULL;
+
+ if (fndecl && ret)
+ DECL_FUNCTION_SPECIFIC_TARGET (fndecl) = new_target;
+
+ cl_target_option_restore (&global_options, &global_options_set, &cur_target);
+
+ return ret;
+}
+
+/* This parses the attribute arguments to target_version in DECL and the
+ feature mask required to select those targets. No adjustments are made to
+ add or remove redundant feature requirements. */
+
+static aarch64_fmv_feature_mask
+get_feature_mask_for_version (tree decl)
+{
+ tree version_attr = lookup_attribute ("target_version",
+ DECL_ATTRIBUTES (decl));
+ if (version_attr == NULL)
+ return 0;
+
+ const char *version_string = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE
+ (version_attr)));
+ enum aarch_parse_opt_result parse_res;
+ aarch64_fmv_feature_mask feature_mask;
+
+ parse_res = aarch64_parse_fmv_features (version_string, NULL, &feature_mask,
+ NULL);
+
+ /* We should have detected any errors before getting here. */
+ gcc_assert (parse_res == AARCH_PARSE_OK);
+
+ return feature_mask;
+}
+
+/* Compare priorities of two feature masks. Return:
+ 1: mask1 is higher priority
+ -1: mask2 is higher priority
+ 0: masks are equal. */
+
+static int
+compare_feature_masks (aarch64_fmv_feature_mask mask1,
+ aarch64_fmv_feature_mask mask2)
+{
+ int pop1 = popcount_hwi (mask1);
+ int pop2 = popcount_hwi (mask2);
+ if (pop1 > pop2)
+ return 1;
+ if (pop2 > pop1)
+ return -1;
+
+ auto diff_mask = mask1 ^ mask2;
+ if (diff_mask == 0ULL)
+ return 0;
+ for (int i = FEAT_MAX - 1; i > 0; i--)
+ {
+ auto bit_mask = aarch64_fmv_feature_data[i].feature_mask;
+ if (diff_mask & bit_mask)
+ return (mask1 & bit_mask) ? 1 : -1;
+ }
+ gcc_unreachable();
+}
+
+/* Compare priorities of two version decls. */
+
+int
+aarch64_compare_version_priority (tree decl1, tree decl2)
+{
+ auto mask1 = get_feature_mask_for_version (decl1);
+ auto mask2 = get_feature_mask_for_version (decl2);
+
+ return compare_feature_masks (mask1, mask2);
+}
+
+/* Build the struct __ifunc_arg_t type:
+
+ struct __ifunc_arg_t
+ {
+ unsigned long _size; // Size of the struct, so it can grow.
+ unsigned long _hwcap;
+ unsigned long _hwcap2;
+ }
+ */
+
+static tree
+build_ifunc_arg_type ()
+{
+ tree ifunc_arg_type = lang_hooks.types.make_type (RECORD_TYPE);
+ tree field1 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
+ get_identifier ("_size"),
+ long_unsigned_type_node);
+ tree field2 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
+ get_identifier ("_hwcap"),
+ long_unsigned_type_node);
+ tree field3 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
+ get_identifier ("_hwcap2"),
+ long_unsigned_type_node);
+
+ DECL_FIELD_CONTEXT (field1) = ifunc_arg_type;
+ DECL_FIELD_CONTEXT (field2) = ifunc_arg_type;
+ DECL_FIELD_CONTEXT (field3) = ifunc_arg_type;
+
+ TYPE_FIELDS (ifunc_arg_type) = field1;
+ DECL_CHAIN (field1) = field2;
+ DECL_CHAIN (field2) = field3;
+
+ layout_type (ifunc_arg_type);
+
+ tree const_type = build_qualified_type (ifunc_arg_type, TYPE_QUAL_CONST);
+ tree pointer_type = build_pointer_type (const_type);
+
+ return pointer_type;
+}
+
+/* Make the resolver function decl to dispatch the versions of
+ a multi-versioned function, DEFAULT_DECL. IFUNC_ALIAS_DECL is
+ ifunc alias that will point to the created resolver. Create an
+ empty basic block in the resolver and store the pointer in
+ EMPTY_BB. Return the decl of the resolver function. */
+
+static tree
+make_resolver_func (const tree default_decl,
+ const tree ifunc_alias_decl,
+ basic_block *empty_bb)
+{
+ tree decl, type, t;
+
+ /* Create resolver function name based on default_decl. */
+ tree decl_name = clone_function_name (default_decl, "resolver");
+ const char *resolver_name = IDENTIFIER_POINTER (decl_name);
+
+ /* The resolver function should have signature
+ (void *) resolver (uint64_t, const __ifunc_arg_t *) */
+ type = build_function_type_list (ptr_type_node,
+ uint64_type_node,
+ build_ifunc_arg_type (),
+ NULL_TREE);
+
+ decl = build_fn_decl (resolver_name, type);
+ SET_DECL_ASSEMBLER_NAME (decl, decl_name);
+
+ DECL_NAME (decl) = decl_name;
+ TREE_USED (decl) = 1;
+ DECL_ARTIFICIAL (decl) = 1;
+ DECL_IGNORED_P (decl) = 1;
+ TREE_PUBLIC (decl) = 0;
+ DECL_UNINLINABLE (decl) = 1;
+
+ /* Resolver is not external, body is generated. */
+ DECL_EXTERNAL (decl) = 0;
+ DECL_EXTERNAL (ifunc_alias_decl) = 0;
+
+ DECL_CONTEXT (decl) = NULL_TREE;
+ DECL_INITIAL (decl) = make_node (BLOCK);
+ DECL_STATIC_CONSTRUCTOR (decl) = 0;
+
+ if (DECL_COMDAT_GROUP (default_decl)
+ || TREE_PUBLIC (default_decl))
+ {
+ /* In this case, each translation unit with a call to this
+ versioned function will put out a resolver. Ensure it
+ is comdat to keep just one copy. */
+ DECL_COMDAT (decl) = 1;
+ make_decl_one_only (decl, DECL_ASSEMBLER_NAME (decl));
+ }
+ else
+ TREE_PUBLIC (ifunc_alias_decl) = 0;
+
+ /* Build result decl and add to function_decl. */
+ t = build_decl (UNKNOWN_LOCATION, RESULT_DECL, NULL_TREE, ptr_type_node);
+ DECL_CONTEXT (t) = decl;
+ DECL_ARTIFICIAL (t) = 1;
+ DECL_IGNORED_P (t) = 1;
+ DECL_RESULT (decl) = t;
+
+ /* Build parameter decls and add to function_decl. */
+ tree arg1 = build_decl (UNKNOWN_LOCATION, PARM_DECL,
+ get_identifier ("hwcap"),
+ uint64_type_node);
+ tree arg2 = build_decl (UNKNOWN_LOCATION, PARM_DECL,
+ get_identifier ("arg"),
+ build_ifunc_arg_type());
+ DECL_CONTEXT (arg1) = decl;
+ DECL_CONTEXT (arg2) = decl;
+ DECL_ARTIFICIAL (arg1) = 1;
+ DECL_ARTIFICIAL (arg2) = 1;
+ DECL_IGNORED_P (arg1) = 1;
+ DECL_IGNORED_P (arg2) = 1;
+ DECL_ARG_TYPE (arg1) = uint64_type_node;
+ DECL_ARG_TYPE (arg2) = build_ifunc_arg_type ();
+ DECL_ARGUMENTS (decl) = arg1;
+ TREE_CHAIN (arg1) = arg2;
+
+ gimplify_function_tree (decl);
+ push_cfun (DECL_STRUCT_FUNCTION (decl));
+ *empty_bb = init_lowered_empty_function (decl, false,
+ profile_count::uninitialized ());
+
+ cgraph_node::add_new_function (decl, true);
+ symtab->call_cgraph_insertion_hooks (cgraph_node::get_create (decl));
+
+ pop_cfun ();
+
+ gcc_assert (ifunc_alias_decl != NULL);
+ /* Mark ifunc_alias_decl as "ifunc" with resolver as resolver_name. */
+ DECL_ATTRIBUTES (ifunc_alias_decl)
+ = make_attribute ("ifunc", resolver_name,
+ DECL_ATTRIBUTES (ifunc_alias_decl));
+
+ /* Create the alias for dispatch to resolver here. */
+ cgraph_node::create_same_body_alias (ifunc_alias_decl, decl);
+ return decl;
+}
+
+/* This adds a condition to the basic_block NEW_BB in function FUNCTION_DECL
+ to return a pointer to VERSION_DECL if all feature bits specified in
+ FEATURE_MASK are not set in MASK_VAR. This function will be called during
+ version dispatch to decide which function version to execute. It returns
+ the basic block at the end, to which more conditions can be added. */
+static basic_block
+add_condition_to_bb (tree function_decl, tree version_decl,
+ aarch64_fmv_feature_mask feature_mask,
+ tree mask_var, basic_block new_bb)
+{
+ gimple *return_stmt;
+ tree convert_expr, result_var;
+ gimple *convert_stmt;
+ gimple *if_else_stmt;
+
+ basic_block bb1, bb2, bb3;
+ edge e12, e23;
+
+ gimple_seq gseq;
+
+ push_cfun (DECL_STRUCT_FUNCTION (function_decl));
+
+ gcc_assert (new_bb != NULL);
+ gseq = bb_seq (new_bb);
+
+ convert_expr = build1 (CONVERT_EXPR, ptr_type_node,
+ build_fold_addr_expr (version_decl));
+ result_var = create_tmp_var (ptr_type_node);
+ convert_stmt = gimple_build_assign (result_var, convert_expr);
+ return_stmt = gimple_build_return (result_var);
+
+ if (feature_mask == 0ULL)
+ {
+ /* Default version. */
+ gimple_seq_add_stmt (&gseq, convert_stmt);
+ gimple_seq_add_stmt (&gseq, return_stmt);
+ set_bb_seq (new_bb, gseq);
+ gimple_set_bb (convert_stmt, new_bb);
+ gimple_set_bb (return_stmt, new_bb);
+ pop_cfun ();
+ return new_bb;
+ }
+
+ tree and_expr_var = create_tmp_var (long_long_unsigned_type_node);
+ tree and_expr = build2 (BIT_AND_EXPR,
+ long_long_unsigned_type_node,
+ mask_var,
+ build_int_cst (long_long_unsigned_type_node,
+ feature_mask));
+ gimple *and_stmt = gimple_build_assign (and_expr_var, and_expr);
+ gimple_set_block (and_stmt, DECL_INITIAL (function_decl));
+ gimple_set_bb (and_stmt, new_bb);
+ gimple_seq_add_stmt (&gseq, and_stmt);
+
+ tree zero_llu = build_int_cst (long_long_unsigned_type_node, 0);
+ if_else_stmt = gimple_build_cond (EQ_EXPR, and_expr_var, zero_llu,
+ NULL_TREE, NULL_TREE);
+ gimple_set_block (if_else_stmt, DECL_INITIAL (function_decl));
+ gimple_set_bb (if_else_stmt, new_bb);
+ gimple_seq_add_stmt (&gseq, if_else_stmt);
+
+ gimple_seq_add_stmt (&gseq, convert_stmt);
+ gimple_seq_add_stmt (&gseq, return_stmt);
+ set_bb_seq (new_bb, gseq);
+
+ bb1 = new_bb;
+ e12 = split_block (bb1, if_else_stmt);
+ bb2 = e12->dest;
+ e12->flags &= ~EDGE_FALLTHRU;
+ e12->flags |= EDGE_TRUE_VALUE;
+
+ e23 = split_block (bb2, return_stmt);
+
+ gimple_set_bb (convert_stmt, bb2);
+ gimple_set_bb (return_stmt, bb2);
+
+ bb3 = e23->dest;
+ make_edge (bb1, bb3, EDGE_FALSE_VALUE);
+
+ remove_edge (e23);
+ make_edge (bb2, EXIT_BLOCK_PTR_FOR_FN (cfun), 0);
+
+ pop_cfun ();
+
+ return bb3;
+}
+
+/* This function generates the dispatch function for
+ multi-versioned functions. DISPATCH_DECL is the function which will
+ contain the dispatch logic. FNDECLS are the function choices for
+ dispatch, and is a tree chain. EMPTY_BB is the basic block pointer
+ in DISPATCH_DECL in which the dispatch code is generated. */
+
+static int
+dispatch_function_versions (tree dispatch_decl,
+ void *fndecls_p,
+ basic_block *empty_bb)
+{
+ gimple *ifunc_cpu_init_stmt;
+ gimple_seq gseq;
+ vec<tree> *fndecls;
+
+ gcc_assert (dispatch_decl != NULL
+ && fndecls_p != NULL
+ && empty_bb != NULL);
+
+ push_cfun (DECL_STRUCT_FUNCTION (dispatch_decl));
+
+ gseq = bb_seq (*empty_bb);
+ /* Function version dispatch is via IFUNC. IFUNC resolvers fire before
+ constructors, so explicity call __init_cpu_features_resolver here. */
+ tree init_fn_type = build_function_type_list (void_type_node,
+ long_unsigned_type_node,
+ build_ifunc_arg_type(),
+ NULL);
+ tree init_fn_id = get_identifier ("__init_cpu_features_resolver");
+ tree init_fn_decl = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
+ init_fn_id, init_fn_type);
+ tree arg1 = DECL_ARGUMENTS (dispatch_decl);
+ tree arg2 = TREE_CHAIN (arg1);
+ ifunc_cpu_init_stmt = gimple_build_call (init_fn_decl, 2, arg1, arg2);
+ gimple_seq_add_stmt (&gseq, ifunc_cpu_init_stmt);
+ gimple_set_bb (ifunc_cpu_init_stmt, *empty_bb);
+
+ /* Build the struct type for __aarch64_cpu_features. */
+ tree global_type = lang_hooks.types.make_type (RECORD_TYPE);
+ tree field1 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
+ get_identifier ("features"),
+ long_long_unsigned_type_node);
+ DECL_FIELD_CONTEXT (field1) = global_type;
+ TYPE_FIELDS (global_type) = field1;
+ layout_type (global_type);
+
+ tree global_var = build_decl (UNKNOWN_LOCATION, VAR_DECL,
+ get_identifier ("__aarch64_cpu_features"),
+ global_type);
+ DECL_EXTERNAL (global_var) = 1;
+ tree mask_var = create_tmp_var (long_long_unsigned_type_node);
+
+ tree component_expr = build3 (COMPONENT_REF, long_long_unsigned_type_node,
+ global_var, field1, NULL_TREE);
+ gimple *component_stmt = gimple_build_assign (mask_var, component_expr);
+ gimple_set_block (component_stmt, DECL_INITIAL (dispatch_decl));
+ gimple_set_bb (component_stmt, *empty_bb);
+ gimple_seq_add_stmt (&gseq, component_stmt);
+
+ tree not_expr = build1 (BIT_NOT_EXPR, long_long_unsigned_type_node, mask_var);
+ gimple *not_stmt = gimple_build_assign (mask_var, not_expr);
+ gimple_set_block (not_stmt, DECL_INITIAL (dispatch_decl));
+ gimple_set_bb (not_stmt, *empty_bb);
+ gimple_seq_add_stmt (&gseq, not_stmt);
+
+ set_bb_seq (*empty_bb, gseq);
+
+ pop_cfun ();
+
+ /* fndecls_p is actually a vector. */
+ fndecls = static_cast<vec<tree> *> (fndecls_p);
+
+ /* At least one more version other than the default. */
+ unsigned int num_versions = fndecls->length ();
+ gcc_assert (num_versions >= 2);
+
+ struct function_version_info
+ {
+ tree version_decl;
+ aarch64_fmv_feature_mask feature_mask;
+ } *function_versions;
+
+ function_versions = (struct function_version_info *)
+ XNEWVEC (struct function_version_info, (num_versions));
+
+ unsigned int actual_versions = 0;
+
+ for (tree version_decl : *fndecls)
+ {
+ aarch64_fmv_feature_mask feature_mask;
+ /* Get attribute string, parse it and find the right features. */
+ feature_mask = get_feature_mask_for_version (version_decl);
+ function_versions [actual_versions].version_decl = version_decl;
+ function_versions [actual_versions].feature_mask = feature_mask;
+ actual_versions++;
+ }
+
+ auto compare_feature_version_info = [](const void *p1, const void *p2) {
+ const function_version_info v1 = *(const function_version_info *)p1;
+ const function_version_info v2 = *(const function_version_info *)p2;
+ return - compare_feature_masks (v1.feature_mask, v2.feature_mask);
+ };
+
+ /* Sort the versions according to descending order of dispatch priority. */
+ qsort (function_versions, actual_versions,
+ sizeof (struct function_version_info), compare_feature_version_info);
+
+ for (unsigned int i = 0; i < actual_versions; ++i)
+ *empty_bb = add_condition_to_bb (dispatch_decl,
+ function_versions[i].version_decl,
+ function_versions[i].feature_mask,
+ mask_var,
+ *empty_bb);
+
+ free (function_versions);
+ return 0;
+}
+
+/* Implement TARGET_GENERATE_VERSION_DISPATCHER_BODY. */
+
+tree
+aarch64_generate_version_dispatcher_body (void *node_p)
+{
+ tree resolver_decl;
+ basic_block empty_bb;
+ tree default_ver_decl;
+ struct cgraph_node *versn;
+ struct cgraph_node *node;
+
+ struct cgraph_function_version_info *node_version_info = NULL;
+ struct cgraph_function_version_info *versn_info = NULL;
+
+ node = (cgraph_node *)node_p;
+
+ node_version_info = node->function_version ();
+ gcc_assert (node->dispatcher_function
+ && node_version_info != NULL);
+
+ if (node_version_info->dispatcher_resolver)
+ return node_version_info->dispatcher_resolver;
+
+ /* The first version in the chain corresponds to the default version. */
+ default_ver_decl = node_version_info->next->this_node->decl;
+
+ /* node is going to be an alias, so remove the finalized bit. */
+ node->definition = false;
+
+ resolver_decl = make_resolver_func (default_ver_decl,
+ node->decl, &empty_bb);
+
+ node_version_info->dispatcher_resolver = resolver_decl;
+
+ push_cfun (DECL_STRUCT_FUNCTION (resolver_decl));
+
+ auto_vec<tree, 2> fn_ver_vec;
+
+ for (versn_info = node_version_info->next; versn_info;
+ versn_info = versn_info->next)
+ {
+ versn = versn_info->this_node;
+ /* Check for virtual functions here again, as by this time it should
+ have been determined if this function needs a vtable index or
+ not. This happens for methods in derived classes that override
+ virtual methods in base classes but are not explicitly marked as
+ virtual. */
+ if (DECL_VINDEX (versn->decl))
+ sorry ("virtual function multiversioning not supported");
+
+ fn_ver_vec.safe_push (versn->decl);
+ }
+
+ dispatch_function_versions (resolver_decl, &fn_ver_vec, &empty_bb);
+ cgraph_edge::rebuild_edges ();
+ pop_cfun ();
+ return resolver_decl;
+}
+
+/* Make a dispatcher declaration for the multi-versioned function DECL.
+ Calls to DECL function will be replaced with calls to the dispatcher
+ by the front-end. Returns the decl of the dispatcher function. */
+
+tree
+aarch64_get_function_versions_dispatcher (void *decl)
+{
+ tree fn = (tree) decl;
+ struct cgraph_node *node = NULL;
+ struct cgraph_node *default_node = NULL;
+ struct cgraph_function_version_info *node_v = NULL;
+ struct cgraph_function_version_info *first_v = NULL;
+
+ tree dispatch_decl = NULL;
+
+ struct cgraph_function_version_info *default_version_info = NULL;
+
+ gcc_assert (fn != NULL && DECL_FUNCTION_VERSIONED (fn));
+
+ node = cgraph_node::get (fn);
+ gcc_assert (node != NULL);
+
+ node_v = node->function_version ();
+ gcc_assert (node_v != NULL);
+
+ if (node_v->dispatcher_resolver != NULL)
+ return node_v->dispatcher_resolver;
+
+ /* Find the default version and make it the first node. */
+ first_v = node_v;
+ /* Go to the beginning of the chain. */
+ while (first_v->prev != NULL)
+ first_v = first_v->prev;
+ default_version_info = first_v;
+ while (default_version_info != NULL)
+ {
+ if (get_feature_mask_for_version
+ (default_version_info->this_node->decl) == 0ULL)
+ break;
+ default_version_info = default_version_info->next;
+ }
+
+ /* If there is no default node, just return NULL. */
+ if (default_version_info == NULL)
+ return NULL;
+
+ /* Make default info the first node. */
+ if (first_v != default_version_info)
+ {
+ default_version_info->prev->next = default_version_info->next;
+ if (default_version_info->next)
+ default_version_info->next->prev = default_version_info->prev;
+ first_v->prev = default_version_info;
+ default_version_info->next = first_v;
+ default_version_info->prev = NULL;
+ }
+
+ default_node = default_version_info->this_node;
+
+ if (targetm.has_ifunc_p ())
+ {
+ struct cgraph_function_version_info *it_v = NULL;
+ struct cgraph_node *dispatcher_node = NULL;
+ struct cgraph_function_version_info *dispatcher_version_info = NULL;
+
+ /* Right now, the dispatching is done via ifunc. */
+ dispatch_decl = make_dispatcher_decl (default_node->decl);
+ TREE_NOTHROW (dispatch_decl) = TREE_NOTHROW (fn);
+
+ dispatcher_node = cgraph_node::get_create (dispatch_decl);
+ gcc_assert (dispatcher_node != NULL);
+ dispatcher_node->dispatcher_function = 1;
+ dispatcher_version_info
+ = dispatcher_node->insert_new_function_version ();
+ dispatcher_version_info->next = default_version_info;
+ dispatcher_node->definition = 1;
+
+ /* Set the dispatcher for all the versions. */
+ it_v = default_version_info;
+ while (it_v != NULL)
+ {
+ it_v->dispatcher_resolver = dispatch_decl;
+ it_v = it_v->next;
+ }
+ }
+ else
+ {
+ error_at (DECL_SOURCE_LOCATION (default_node->decl),
+ "multiversioning needs %<ifunc%> which is not supported "
+ "on this target");
+ }
+
+ return dispatch_decl;
+}
+
+/* This function returns true if FN1 and FN2 are versions of the same function,
+ that is, the target_version attributes of the function decls are different.
+ This assumes that FN1 and FN2 have the same signature. */
+
+bool
+aarch64_common_function_versions (tree fn1, tree fn2)
+{
+ if (TREE_CODE (fn1) != FUNCTION_DECL
+ || TREE_CODE (fn2) != FUNCTION_DECL)
+ return false;
+
+ return (aarch64_compare_version_priority (fn1, fn2) != 0);
+}
+
+/* Implement TARGET_MANGLE_DECL_ASSEMBLER_NAME, to add function multiversioning
+ suffixes. */
+
+tree
+aarch64_mangle_decl_assembler_name (tree decl, tree id)
+{
+ /* For function version, add the target suffix to the assembler name. */
+ if (TREE_CODE (decl) == FUNCTION_DECL
+ && DECL_FUNCTION_VERSIONED (decl))
+ {
+ aarch64_fmv_feature_mask feature_mask = get_feature_mask_for_version (decl);
+
+ /* No suffix for the default version. */
+ if (feature_mask == 0ULL)
+ return id;
+
+ std::string name = IDENTIFIER_POINTER (id);
+ name += "._";
+
+ for (int i = 0; i < FEAT_MAX; i++)
+ {
+ if (feature_mask & aarch64_fmv_feature_data[i].feature_mask)
+ {
+ name += "M";
+ name += aarch64_fmv_feature_data[i].name;
+ }
+ }
+
+ if (DECL_ASSEMBLER_NAME_SET_P (decl))
+ SET_DECL_RTL (decl, NULL);
+
+ id = get_identifier (name.c_str());
+ }
+ return id;
+}
+
/* Implement TARGET_FUNCTION_ATTRIBUTE_INLINABLE_P. Use an opt-out
rather than an opt-in list. */
@@ -29571,6 +30411,10 @@ aarch64_libgcc_floating_mode_supported_p
#undef TARGET_OPTION_VALID_ATTRIBUTE_P
#define TARGET_OPTION_VALID_ATTRIBUTE_P aarch64_option_valid_attribute_p
+#undef TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P
+#define TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P \
+ aarch64_option_valid_version_attribute_p
+
#undef TARGET_SET_CURRENT_FUNCTION
#define TARGET_SET_CURRENT_FUNCTION aarch64_set_current_function
@@ -29940,6 +30784,23 @@ aarch64_libgcc_floating_mode_supported_p
#undef TARGET_EMIT_EPILOGUE_FOR_SIBCALL
#define TARGET_EMIT_EPILOGUE_FOR_SIBCALL aarch64_expand_epilogue
+#undef TARGET_OPTION_FUNCTION_VERSIONS
+#define TARGET_OPTION_FUNCTION_VERSIONS aarch64_common_function_versions
+
+#undef TARGET_COMPARE_VERSION_PRIORITY
+#define TARGET_COMPARE_VERSION_PRIORITY aarch64_compare_version_priority
+
+#undef TARGET_GENERATE_VERSION_DISPATCHER_BODY
+#define TARGET_GENERATE_VERSION_DISPATCHER_BODY \
+ aarch64_generate_version_dispatcher_body
+
+#undef TARGET_GET_FUNCTION_VERSIONS_DISPATCHER
+#define TARGET_GET_FUNCTION_VERSIONS_DISPATCHER \
+ aarch64_get_function_versions_dispatcher
+
+#undef TARGET_MANGLE_DECL_ASSEMBLER_NAME
+#define TARGET_MANGLE_DECL_ASSEMBLER_NAME aarch64_mangle_decl_assembler_name
+
struct gcc_target targetm = TARGET_INITIALIZER;
#include "gt-aarch64.h"
diff --git a/gcc/config/arm/aarch-common.h b/gcc/config/arm/aarch-common.h
index f72e21127fc898f5ffa10e274820fa4316fd41cf..c384291991c26b6de2c821dc4eea95b1888db398 100644
--- a/gcc/config/arm/aarch-common.h
+++ b/gcc/config/arm/aarch-common.h
@@ -23,7 +23,7 @@
#define GCC_AARCH_COMMON_H
/* Enum describing the various ways that the
- aarch*_parse_{arch,tune,cpu,extension} functions can fail.
+ aarch*_parse_{arch,tune,cpu,extension,fmv_extension} functions can fail.
This way their callers can choose what kind of error to give. */
enum aarch_parse_opt_result
@@ -31,7 +31,8 @@ enum aarch_parse_opt_result
AARCH_PARSE_OK, /* Parsing was successful. */
AARCH_PARSE_MISSING_ARG, /* Missing argument. */
AARCH_PARSE_INVALID_FEATURE, /* Invalid feature modifier. */
- AARCH_PARSE_INVALID_ARG /* Invalid arch, tune, cpu arg. */
+ AARCH_PARSE_INVALID_ARG, /* Invalid arch, tune, cpu arg. */
+ AARCH_PARSE_DUPLICATE_FEATURE /* Duplicate feature modifier. */
};
/* Function types -msign-return-address should sign. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c
index fb5a7a18ad1a2d09ac4b231150a1bd9e72d6fab6..c175e22f88fd5165d42866eb989de8af3ee5f6c6 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c
@@ -7,6 +7,6 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\n} } } */
/* Test a normal looking procinfo. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c
index b29d50e1f79f92e45add1627904a695c511aec75..0264a4737103ce093741d4f0b161f78cd18a0d6a 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c
@@ -7,6 +7,6 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\n} } } */
/* Test one with mixed order of feature bits. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c
index b3613165a05bf2fd1e93e6d89361ae9969ed62ba..649e48e7e0b727cef573ff12f1e3efb90bbb5e7f 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c
@@ -7,6 +7,6 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\+sve2\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\+sve2\n} } } */
/* Test a normal looking procinfo. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c
index a9dde5ffab1405488d15d58c6420890a1b16e16a..078d7bc899ccd01c70369fe985268949c351da0b 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c
@@ -7,6 +7,6 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\+sve2\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\+sve2\n} } } */
/* Test a normal looking procinfo. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c
index 10325df4497227a80297a140c9e1d689fccf96ef..57eedb463091f051c19533c054204f9352b6446e 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8.6-a\+crc\+fp16\+aes\+sha3\+rng\+nopauth\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8.6-a\+rng\+crc\+aes\+sha3\+fp16\+nopauth\n} } } */
/* Test one where the boundary of buffer size would overwrite the last
character read when stitching the fgets-calls together. With the
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c
index 980d3f79dfb03b0d8eb68f691bf2dedf80aed87d..a5b4b4d3442c6522a8cdadf4eebd3b5460e37213 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+profile\+memtag\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\+nopauth\n} } } */
+/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+memtag\+profile\+nopauth\n} } } */
/* Test one that if the kernel doesn't report the availability of a mandatory
feature that it has turned it off for whatever reason. As such compilers
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c
index 117df2b0b6cd5751d9f5175b4343aad9825a6c43..e12aa543d02924f268729f96fe1f17181287f097 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+profile\+memtag\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\n} } } */
+/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+memtag\+profile\n} } } */
/* Check whether features that don't have a midr name during detection are
correctly ignored. These features shouldn't affect the native detection.
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c
index efbd02cbdc0638db85e776f1e79043709c11df21..920e1d65711cbcb77b07441597180c0159ccabf9 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+lse\+rcpc\+rdma\+dotprod\+fp16fml\+sb\+ssbs\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\+flagm\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+flagm\+dotprod\+rdma\+lse\+crc\+fp16fml\+rcpc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+sb\+ssbs\n} } } */
/* Check that an Armv8-A core doesn't fall apart on extensions without midr
values. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c
index d431d4938265d024891b464ac3d069607b21d8e7..416a29b514ab7599a7092e26e3716ec8a50cc895 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+lse\+rcpc\+rdma\+dotprod\+fp16fml\+sb\+ssbs\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\+flagm\+pauth\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+flagm\+dotprod\+rdma\+lse\+crc\+fp16fml\+rcpc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+sb\+ssbs\+pauth\n} } } */
/* Check that an Armv8-A core doesn't fall apart on extensions without midr
values and that it enables optional features. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c
index 20012beff7b85c14817e38437650d412ab7bb137..5d39a2d8c4da5de6ed7ec832db90ae7f625d997d 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+fp16\+crypto\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+crypto\+fp16\n} } } */
-/* Test one where the feature bits for crypto and fp16 are given in
- same order as declared in options file. */
+/* Test one where the crypto and fp16 options are specified in different
+ order from what is in the options file. */
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c
index 70a7e62fdffc4a908df083505c03a5fde70ce883..67c4bc2b9ea446201666c9810c779d1823a5cb9b 100644
--- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c
@@ -7,7 +7,7 @@ int main()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8-a\+fp16\+crypto\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8-a\+crypto\+fp16\n} } } */
-/* Test one where the crypto and fp16 options are specified in different
- order from what is in the options file. */
+/* Test one where the feature bits for crypto and fp16 are given in
+ same order as declared in options file. */
diff --git a/gcc/testsuite/gcc.target/aarch64/options_set_17.c b/gcc/testsuite/gcc.target/aarch64/options_set_17.c
index 8b21e2e1a0a0d4c7daa13fc6c3e4968786474a74..b1603fbcf2a1b27c00fe2b47a8a65af551a3d726 100644
--- a/gcc/testsuite/gcc.target/aarch64/options_set_17.c
+++ b/gcc/testsuite/gcc.target/aarch64/options_set_17.c
@@ -6,6 +6,6 @@ int main ()
return 0;
}
-/* { dg-final { scan-assembler {\.arch armv8\.2-a\+crc\+dotprod\n} } } */
+/* { dg-final { scan-assembler {\.arch armv8\.2-a\+dotprod\+crc\n} } } */
/* dotprod needs to be emitted pre armv8.4. */
diff --git a/libgcc/config/aarch64/cpuinfo.c b/libgcc/config/aarch64/cpuinfo.c
index 634f591c194bc70048f714d7eb0ace1f2f4137ea..72185bee7cdd062e20a3e9f6f627f4120d1b2fb5 100644
--- a/libgcc/config/aarch64/cpuinfo.c
+++ b/libgcc/config/aarch64/cpuinfo.c
@@ -22,6 +22,8 @@
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
+#include "common/config/aarch64/cpuinfo.h"
+
#if __has_include(<sys/auxv.h>)
#include <sys/auxv.h>
@@ -38,73 +40,6 @@ typedef struct __ifunc_arg_t {
#if __has_include(<asm/hwcap.h>)
#include <asm/hwcap.h>
-/* CPUFeatures must correspond to the same AArch64 features in aarch64.cc */
-enum CPUFeatures {
- FEAT_RNG,
- FEAT_FLAGM,
- FEAT_FLAGM2,
- FEAT_FP16FML,
- FEAT_DOTPROD,
- FEAT_SM4,
- FEAT_RDM,
- FEAT_LSE,
- FEAT_FP,
- FEAT_SIMD,
- FEAT_CRC,
- FEAT_SHA1,
- FEAT_SHA2,
- FEAT_SHA3,
- FEAT_AES,
- FEAT_PMULL,
- FEAT_FP16,
- FEAT_DIT,
- FEAT_DPB,
- FEAT_DPB2,
- FEAT_JSCVT,
- FEAT_FCMA,
- FEAT_RCPC,
- FEAT_RCPC2,
- FEAT_FRINTTS,
- FEAT_DGH,
- FEAT_I8MM,
- FEAT_BF16,
- FEAT_EBF16,
- FEAT_RPRES,
- FEAT_SVE,
- FEAT_SVE_BF16,
- FEAT_SVE_EBF16,
- FEAT_SVE_I8MM,
- FEAT_SVE_F32MM,
- FEAT_SVE_F64MM,
- FEAT_SVE2,
- FEAT_SVE_AES,
- FEAT_SVE_PMULL128,
- FEAT_SVE_BITPERM,
- FEAT_SVE_SHA3,
- FEAT_SVE_SM4,
- FEAT_SME,
- FEAT_MEMTAG,
- FEAT_MEMTAG2,
- FEAT_MEMTAG3,
- FEAT_SB,
- FEAT_PREDRES,
- FEAT_SSBS,
- FEAT_SSBS2,
- FEAT_BTI,
- FEAT_LS64,
- FEAT_LS64_V,
- FEAT_LS64_ACCDATA,
- FEAT_WFXT,
- FEAT_SME_F64,
- FEAT_SME_I64,
- FEAT_SME2,
- FEAT_RCPC3,
- FEAT_MAX,
- FEAT_EXT = 62, /* Reserved to indicate presence of additional features field
- in __aarch64_cpu_features. */
- FEAT_INIT /* Used as flag of features initialization completion. */
-};
-
/* Architecture features used in Function Multi Versioning. */
struct {
unsigned long long features;
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [committed v4 5/5] aarch64: Add function multiversioning support
2023-12-16 0:47 ` [committed v4 " Andrew Carlotti
@ 2023-12-16 4:03 ` Ramana Radhakrishnan
0 siblings, 0 replies; 11+ messages in thread
From: Ramana Radhakrishnan @ 2023-12-16 4:03 UTC (permalink / raw)
To: Andrew Carlotti; +Cc: gcc-patches, Richard Sandiford
On Sat, Dec 16, 2023 at 6:18 AM Andrew Carlotti <andrew.carlotti@arm.com> wrote:
>
> This adds initial support for function multiversioning on aarch64 using
> the target_version and target_clones attributes. This loosely follows
> the Beta specification in the ACLE [1], although with some differences
> that still need to be resolved (possibly as follow-up patches).
>
> Existing function multiversioning implementations are broken in various
> ways when used across translation units. This includes placing
> resolvers in the wrong translation units, and using symbol mangling that
> callers to unintentionally bypass the resolver in some circumstances.
> Fixing these issues for aarch64 will require modifications to our ACLE
> specification. It will also require further adjustments to existing
> middle end code, to facilitate different mangling and resolver
> placement while preserving existing target behaviours.
>
> The list of function multiversioning features specified in the ACLE is
> also inconsistent with the list of features supported in target option
> extensions. I intend to resolve some or all of these inconsistencies at
> a later stage.
>
> The target_version attribute is currently only supported in C++, since
> this is the only frontend with existing support for multiversioning
> using the target attribute. On the other hand, this patch happens to
> enable multiversioning with the target_clones attribute in Ada and D, as
> well as the entire C family, using their existing frontend support.
>
> This patch also does not support the following aspects of the Beta
> specification:
>
> - The target_clones attribute should allow an implicit unlisted
> "default" version.
> - There should be an option to disable function multiversioning at
> compile time.
> - Unrecognised target names in a target_clones attribute should be
> ignored (with an optional warning). This current patch raises an
> error instead.
>
> [1] https://github.com/ARM-software/acle/blob/main/main/acle.md#function-multi-versioning
>
> Committed as approved with the coding convention fix, plus some adjustments to
> aarch64-option-extensions.def to accommodate recent changes on master. The
> series passed regression testing as a whole post-rebase on aarch64.
Pretty neat, very nice to see this work land - I would consider this
for the NEWS page for GCC-14.
Ramana
>
> gcc/ChangeLog:
>
> * config/aarch64/aarch64-feature-deps.h (fmv_deps_<FEAT_NAME>):
> Define aarch64_feature_flags mask foreach FMV feature.
> * config/aarch64/aarch64-option-extensions.def: Use new macros
> to define FMV feature extensions.
> * config/aarch64/aarch64.cc (aarch64_option_valid_attribute_p):
> Check for target_version attribute after processing target
> attribute.
> (aarch64_fmv_feature_data): New.
> (aarch64_parse_fmv_features): New.
> (aarch64_process_target_version_attr): New.
> (aarch64_option_valid_version_attribute_p): New.
> (get_feature_mask_for_version): New.
> (compare_feature_masks): New.
> (aarch64_compare_version_priority): New.
> (build_ifunc_arg_type): New.
> (make_resolver_func): New.
> (add_condition_to_bb): New.
> (dispatch_function_versions): New.
> (aarch64_generate_version_dispatcher_body): New.
> (aarch64_get_function_versions_dispatcher): New.
> (aarch64_common_function_versions): New.
> (aarch64_mangle_decl_assembler_name): New.
> (TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P): New implementation.
> (TARGET_OPTION_EXPANDED_CLONES_ATTRIBUTE): New implementation.
> (TARGET_OPTION_FUNCTION_VERSIONS): New implementation.
> (TARGET_COMPARE_VERSION_PRIORITY): New implementation.
> (TARGET_GENERATE_VERSION_DISPATCHER_BODY): New implementation.
> (TARGET_GET_FUNCTION_VERSIONS_DISPATCHER): New implementation.
> (TARGET_MANGLE_DECL_ASSEMBLER_NAME): New implementation.
> * config/aarch64/aarch64.h (TARGET_HAS_FMV_TARGET_ATTRIBUTE):
> Set target macro.
> * config/arm/aarch-common.h (enum aarch_parse_opt_result): Add
> new value to report duplicate FMV feature.
> * common/config/aarch64/cpuinfo.h: New file.
>
> libgcc/ChangeLog:
>
> * config/aarch64/cpuinfo.c (enum CPUFeatures): Move to shared
> copy in gcc/common
>
> gcc/testsuite/ChangeLog:
>
> * gcc.target/aarch64/options_set_17.c: Reorder expected flags.
> * gcc.target/aarch64/cpunative/native_cpu_0.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_13.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_16.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_17.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_18.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_19.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_20.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_21.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_22.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_6.c: Ditto.
> * gcc.target/aarch64/cpunative/native_cpu_7.c: Ditto.
>
>
> diff --git a/gcc/common/config/aarch64/cpuinfo.h b/gcc/common/config/aarch64/cpuinfo.h
> new file mode 100644
> index 0000000000000000000000000000000000000000..1690b6eee48e960d0ae675f8e8b05e6f182b56a3
> --- /dev/null
> +++ b/gcc/common/config/aarch64/cpuinfo.h
> @@ -0,0 +1,94 @@
> +/* CPU feature detection for AArch64 architecture.
> + Copyright (C) 2023 Free Software Foundation, Inc.
> +
> + This file is part of GCC.
> +
> + This file is free software; you can redistribute it and/or modify it
> + under the terms of the GNU General Public License as published by the
> + Free Software Foundation; either version 3, or (at your option) any
> + later version.
> +
> + This file is distributed in the hope that it will be useful, but
> + WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + General Public License for more details.
> +
> + Under Section 7 of GPL version 3, you are granted additional
> + permissions described in the GCC Runtime Library Exception, version
> + 3.1, as published by the Free Software Foundation.
> +
> + You should have received a copy of the GNU General Public License and
> + a copy of the GCC Runtime Library Exception along with this program;
> + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
> + <http://www.gnu.org/licenses/>. */
> +
> +/* This enum is used in libgcc feature detection, and in the function
> + multiversioning implementation in aarch64.cc. The enum should use the same
> + values as the corresponding enum in LLVM's compiler-rt, to faciliate
> + compatibility between compilers. */
> +
> +enum CPUFeatures {
> + FEAT_RNG,
> + FEAT_FLAGM,
> + FEAT_FLAGM2,
> + FEAT_FP16FML,
> + FEAT_DOTPROD,
> + FEAT_SM4,
> + FEAT_RDM,
> + FEAT_LSE,
> + FEAT_FP,
> + FEAT_SIMD,
> + FEAT_CRC,
> + FEAT_SHA1,
> + FEAT_SHA2,
> + FEAT_SHA3,
> + FEAT_AES,
> + FEAT_PMULL,
> + FEAT_FP16,
> + FEAT_DIT,
> + FEAT_DPB,
> + FEAT_DPB2,
> + FEAT_JSCVT,
> + FEAT_FCMA,
> + FEAT_RCPC,
> + FEAT_RCPC2,
> + FEAT_FRINTTS,
> + FEAT_DGH,
> + FEAT_I8MM,
> + FEAT_BF16,
> + FEAT_EBF16,
> + FEAT_RPRES,
> + FEAT_SVE,
> + FEAT_SVE_BF16,
> + FEAT_SVE_EBF16,
> + FEAT_SVE_I8MM,
> + FEAT_SVE_F32MM,
> + FEAT_SVE_F64MM,
> + FEAT_SVE2,
> + FEAT_SVE_AES,
> + FEAT_SVE_PMULL128,
> + FEAT_SVE_BITPERM,
> + FEAT_SVE_SHA3,
> + FEAT_SVE_SM4,
> + FEAT_SME,
> + FEAT_MEMTAG,
> + FEAT_MEMTAG2,
> + FEAT_MEMTAG3,
> + FEAT_SB,
> + FEAT_PREDRES,
> + FEAT_SSBS,
> + FEAT_SSBS2,
> + FEAT_BTI,
> + FEAT_LS64,
> + FEAT_LS64_V,
> + FEAT_LS64_ACCDATA,
> + FEAT_WFXT,
> + FEAT_SME_F64,
> + FEAT_SME_I64,
> + FEAT_SME2,
> + FEAT_RCPC3,
> + FEAT_MAX,
> + FEAT_EXT = 62, /* Reserved to indicate presence of additional features field
> + in __aarch64_cpu_features. */
> + FEAT_INIT /* Used as flag of features initialization completion. */
> +};
> diff --git a/gcc/config/aarch64/aarch64-feature-deps.h b/gcc/config/aarch64/aarch64-feature-deps.h
> index 7b85a8860de57f6727644c03296cef192ad0990c..8f20582e1efdd4817138480bee8cdb27fa7f3dfe 100644
> --- a/gcc/config/aarch64/aarch64-feature-deps.h
> +++ b/gcc/config/aarch64/aarch64-feature-deps.h
> @@ -115,6 +115,13 @@ get_flags_off (aarch64_feature_flags mask)
> constexpr auto cpu_##CORE_IDENT = ARCH_IDENT ().enable | get_enable FEATURES;
> #include "config/aarch64/aarch64-cores.def"
>
> +/* Define fmv_deps_<NAME> variables for each FMV feature, giving the transitive
> + closure of all the features that the FMV feature enables. */
> +#define AARCH64_FMV_FEATURE(A, FEAT_NAME, OPT_FLAGS) \
> + constexpr auto fmv_deps_##FEAT_NAME = get_enable OPT_FLAGS;
> +#include "config/aarch64/aarch64-option-extensions.def"
> +
> +
> }
> }
>
> diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
> index 5aa37ac4e0edacfeffbbf6944a19311455d49288..d8118d8579ce3b24d85063c55587c80a2ea4d5eb 100644
> --- a/gcc/config/aarch64/aarch64-option-extensions.def
> +++ b/gcc/config/aarch64/aarch64-option-extensions.def
> @@ -17,17 +17,22 @@
> along with GCC; see the file COPYING3. If not see
> <http://www.gnu.org/licenses/>. */
>
> -/* This is a list of ISA extentsions in AArch64.
> +/* This is a list of ISA extensions in AArch64.
>
> - Before using #include to read this file, define a macro:
> + Before using #include to read this file, define one of the following
> + macros:
>
> AARCH64_OPT_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON,
> EXPLICIT_OFF, FEATURE_STRING)
>
> + AARCH64_FMV_FEATURE(NAME, FEAT_NAME, IDENT)
> +
> - NAME is the name of the extension, represented as a string constant.
>
> - IDENT is the canonical internal name for this flag.
>
> + - FEAT_NAME is the unprefixed name used in the CPUFeatures enum.
> +
> - REQUIRES is a list of features that must be enabled whenever this
> feature is enabled. The relationship is implicitly transitive:
> if A appears in B's REQUIRES and B appears in C's REQUIRES then
> @@ -58,45 +63,96 @@
> that are required. Their order is not important. An empty string means
> do not detect this feature during auto detection.
>
> - The list of features must follow topological order wrt REQUIRES
> - and EXPLICIT_ON. For example, if A is in B's REQUIRES list, A must
> - come before B. This is enforced by aarch64-feature-deps.h.
> + - OPT_FLAGS is a list of feature IDENTS that should be enabled (along with
> + their transitive dependencies) when the specified FMV feature is present.
> +
> + Where a feature is present as both an extension and a function
> + multiversioning feature, and IDENT matches the FEAT_NAME suffix, then these
> + can be listed here simultaneously using the macro:
> +
> + AARCH64_OPT_FMV_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON,
> + EXPLICIT_OFF, FEATURE_STRING)
> +
> + The list of features extensions must follow topological order wrt REQUIRES
> + and EXPLICIT_ON. For example, if A is in B's REQUIRES list, A must come
> + before B. This is enforced by aarch64-feature-deps.h.
> +
> + The list of multiversioning features must be ordered by increasing priority,
> + as defined in https://github.com/ARM-software/acle/blob/main/main/acle.md
>
> NOTE: Any changes to the AARCH64_OPT_EXTENSION macro need to be mirrored in
> config.gcc. */
>
> +#ifndef AARCH64_OPT_EXTENSION
> +#define AARCH64_OPT_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON, \
> + EXPLICIT_OFF, FEATURE_STRING)
> +#endif
> +
> +#ifndef AARCH64_FMV_FEATURE
> +#define AARCH64_FMV_FEATURE(NAME, FEAT_NAME, OPT_FLAGS)
> +#endif
> +
> +#define AARCH64_OPT_FMV_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON, \
> + EXPLICIT_OFF, FEATURE_STRING) \
> +AARCH64_OPT_EXTENSION(NAME, IDENT, REQUIRES, EXPLICIT_ON, EXPLICIT_OFF, \
> + FEATURE_STRING) \
> +AARCH64_FMV_FEATURE(NAME, IDENT, (IDENT))
> +
> +
> AARCH64_OPT_EXTENSION("fp", FP, (), (), (), "fp")
>
> AARCH64_OPT_EXTENSION("simd", SIMD, (FP), (), (), "asimd")
>
> -AARCH64_OPT_EXTENSION("crc", CRC, (), (), (), "crc32")
> +AARCH64_OPT_FMV_EXTENSION("rng", RNG, (), (), (), "rng")
>
> -AARCH64_OPT_EXTENSION("lse", LSE, (), (), (), "atomics")
> +AARCH64_OPT_FMV_EXTENSION("flagm", FLAGM, (), (), (), "flagm")
>
> -/* +nofp16 disables an implicit F16FML, even though an implicit F16FML
> - does not imply F16. See F16FML for more details. */
> -AARCH64_OPT_EXTENSION("fp16", F16, (FP), (), (F16FML), "fphp asimdhp")
> +AARCH64_FMV_FEATURE("flagm2", FLAGM2, (FLAGM))
> +
> +AARCH64_FMV_FEATURE("fp16fml", FP16FML, (F16FML))
> +
> +AARCH64_OPT_FMV_EXTENSION("dotprod", DOTPROD, (SIMD), (), (), "asimddp")
>
> -AARCH64_OPT_EXTENSION("rcpc", RCPC, (), (), (), "lrcpc")
> +AARCH64_OPT_FMV_EXTENSION("sm4", SM4, (SIMD), (), (), "sm3 sm4")
>
> /* An explicit +rdma implies +simd, but +rdma+nosimd still enables scalar
> RDMA instructions. */
> AARCH64_OPT_EXTENSION("rdma", RDMA, (), (SIMD), (), "asimdrdm")
>
> -AARCH64_OPT_EXTENSION("dotprod", DOTPROD, (SIMD), (), (), "asimddp")
> +AARCH64_FMV_FEATURE("rmd", RDM, (RDMA))
> +
> +AARCH64_OPT_FMV_EXTENSION("lse", LSE, (), (), (), "atomics")
> +
> +AARCH64_FMV_FEATURE("fp", FP, (FP))
> +
> +AARCH64_FMV_FEATURE("simd", SIMD, (SIMD))
> +
> +AARCH64_OPT_FMV_EXTENSION("crc", CRC, (), (), (), "crc32")
> +
> +AARCH64_FMV_FEATURE("sha1", SHA1, ())
>
> -AARCH64_OPT_EXTENSION("aes", AES, (SIMD), (), (), "aes")
> +AARCH64_OPT_FMV_EXTENSION("sha2", SHA2, (SIMD), (), (), "sha1 sha2")
>
> -AARCH64_OPT_EXTENSION("sha2", SHA2, (SIMD), (), (), "sha1 sha2")
> +AARCH64_FMV_FEATURE("sha3", SHA3, (SHA3))
> +
> +AARCH64_OPT_FMV_EXTENSION("aes", AES, (SIMD), (), (), "aes")
> +
> +AARCH64_FMV_FEATURE("pmull", PMULL, ())
>
> /* +nocrypto disables AES, SHA2 and SM4, and anything that depends on them
> (such as SHA3 and the SVE2 crypto extensions). */
> AARCH64_OPT_EXTENSION("crypto", CRYPTO, (AES, SHA2), (), (AES, SHA2, SM4),
> "aes pmull sha1 sha2")
>
> +/* Listing sha3 after crypto means we pass "+aes+sha3" to the assembler
> + instead of "+sha3+crypto". */
> AARCH64_OPT_EXTENSION("sha3", SHA3, (SHA2), (), (), "sha3 sha512")
>
> -AARCH64_OPT_EXTENSION("sm4", SM4, (SIMD), (), (), "sm3 sm4")
> +/* +nofp16 disables an implicit F16FML, even though an implicit F16FML
> + does not imply F16. See F16FML for more details. */
> +AARCH64_OPT_EXTENSION("fp16", F16, (FP), (), (F16FML), "fphp asimdhp")
> +
> +AARCH64_FMV_FEATURE("fp16", FP16, (F16))
>
> /* An explicit +fp16fml implies +fp16, but a dependence on it does not.
> Thus -march=armv8.4-a implies F16FML but not F16. -march=armv8.4-a+fp16
> @@ -104,60 +160,120 @@ AARCH64_OPT_EXTENSION("sm4", SM4, (SIMD), (), (), "sm3 sm4")
> -march=armv8.4-a+nofp16+fp16 enables F16 but not F16FML. */
> AARCH64_OPT_EXTENSION("fp16fml", F16FML, (), (F16), (), "asimdfhm")
>
> -AARCH64_OPT_EXTENSION("sve", SVE, (SIMD, F16), (), (), "sve")
> +AARCH64_FMV_FEATURE("dit", DIT, ())
>
> -AARCH64_OPT_EXTENSION("profile", PROFILE, (), (), (), "")
> +AARCH64_FMV_FEATURE("dpb", DPB, ())
>
> -AARCH64_OPT_EXTENSION("rng", RNG, (), (), (), "rng")
> +AARCH64_FMV_FEATURE("dpb2", DPB2, ())
>
> -AARCH64_OPT_EXTENSION("memtag", MEMTAG, (), (), (), "")
> +AARCH64_FMV_FEATURE("jscvt", JSCVT, ())
>
> -AARCH64_OPT_EXTENSION("sb", SB, (), (), (), "sb")
> +AARCH64_FMV_FEATURE("fcma", FCMA, (SIMD))
>
> -AARCH64_OPT_EXTENSION("ssbs", SSBS, (), (), (), "ssbs")
> +AARCH64_OPT_FMV_EXTENSION("rcpc", RCPC, (), (), (), "lrcpc")
>
> -AARCH64_OPT_EXTENSION("predres", PREDRES, (), (), (), "")
> +AARCH64_FMV_FEATURE("rcpc2", RCPC2, (RCPC))
>
> -AARCH64_OPT_EXTENSION("sve2", SVE2, (SVE), (), (), "sve2")
> +AARCH64_OPT_FMV_EXTENSION("rcpc3", RCPC3, (), (), (), "rcpc3")
>
> -AARCH64_OPT_EXTENSION("sve2-sm4", SVE2_SM4, (SVE2, SM4), (), (), "svesm4")
> +AARCH64_FMV_FEATURE("frintts", FRINTTS, ())
> +
> +AARCH64_FMV_FEATURE("dgh", DGH, ())
> +
> +AARCH64_OPT_FMV_EXTENSION("i8mm", I8MM, (SIMD), (), (), "i8mm")
> +
> +/* An explicit +bf16 implies +simd, but +bf16+nosimd still enables scalar BF16
> + instructions. */
> +AARCH64_OPT_FMV_EXTENSION("bf16", BF16, (FP), (SIMD), (), "bf16")
> +
> +AARCH64_FMV_FEATURE("ebf16", EBF16, (BF16))
> +
> +AARCH64_FMV_FEATURE("rpres", RPRES, ())
> +
> +AARCH64_OPT_FMV_EXTENSION("sve", SVE, (SIMD, F16), (), (), "sve")
> +
> +AARCH64_FMV_FEATURE("sve-bf16", SVE_BF16, (SVE, BF16))
> +
> +AARCH64_FMV_FEATURE("sve-ebf16", SVE_EBF16, (SVE, BF16))
> +
> +AARCH64_FMV_FEATURE("sve-i8mm", SVE_I8MM, (SVE, I8MM))
> +
> +AARCH64_OPT_EXTENSION("f32mm", F32MM, (SVE), (), (), "f32mm")
> +
> +AARCH64_FMV_FEATURE("f32mm", SVE_F32MM, (F32MM))
> +
> +AARCH64_OPT_EXTENSION("f64mm", F64MM, (SVE), (), (), "f64mm")
> +
> +AARCH64_FMV_FEATURE("f64mm", SVE_F64MM, (F64MM))
> +
> +AARCH64_OPT_FMV_EXTENSION("sve2", SVE2, (SVE), (), (), "sve2")
>
> AARCH64_OPT_EXTENSION("sve2-aes", SVE2_AES, (SVE2, AES), (), (), "sveaes")
>
> -AARCH64_OPT_EXTENSION("sve2-sha3", SVE2_SHA3, (SVE2, SHA3), (), (), "svesha3")
> +AARCH64_FMV_FEATURE("sve2-aes", SVE_AES, (SVE2_AES))
> +
> +AARCH64_FMV_FEATURE("sve2-pmull128", SVE_PMULL128, (SVE2))
>
> AARCH64_OPT_EXTENSION("sve2-bitperm", SVE2_BITPERM, (SVE2), (), (),
> "svebitperm")
>
> -AARCH64_OPT_EXTENSION("tme", TME, (), (), (), "")
> +AARCH64_FMV_FEATURE("sve2-bitperm", SVE_BITPERM, (SVE2_BITPERM))
>
> -AARCH64_OPT_EXTENSION("i8mm", I8MM, (SIMD), (), (), "i8mm")
> +AARCH64_OPT_EXTENSION("sve2-sha3", SVE2_SHA3, (SVE2, SHA3), (), (), "svesha3")
>
> -AARCH64_OPT_EXTENSION("f32mm", F32MM, (SVE), (), (), "f32mm")
> +AARCH64_FMV_FEATURE("sve2-sha3", SVE_SHA3, (SVE2_SHA3))
>
> -AARCH64_OPT_EXTENSION("f64mm", F64MM, (SVE), (), (), "f64mm")
> +AARCH64_OPT_EXTENSION("sve2-sm4", SVE2_SM4, (SVE2, SM4), (), (), "svesm4")
>
> -/* An explicit +bf16 implies +simd, but +bf16+nosimd still enables scalar BF16
> - instructions. */
> -AARCH64_OPT_EXTENSION("bf16", BF16, (FP), (SIMD), (), "bf16")
> +AARCH64_FMV_FEATURE("sve2-sm4", SVE_SM4, (SVE2_SM4))
> +
> +AARCH64_OPT_FMV_EXTENSION("sme", SME, (BF16, SVE2), (), (), "sme")
> +
> +AARCH64_OPT_FMV_EXTENSION("memtag", MEMTAG, (), (), (), "")
> +
> +AARCH64_FMV_FEATURE("memtag2", MEMTAG2, (MEMTAG))
> +
> +AARCH64_FMV_FEATURE("memtag3", MEMTAG3, (MEMTAG))
>
> -AARCH64_OPT_EXTENSION("flagm", FLAGM, (), (), (), "flagm")
> +AARCH64_OPT_FMV_EXTENSION("sb", SB, (), (), (), "sb")
> +
> +AARCH64_OPT_FMV_EXTENSION("predres", PREDRES, (), (), (), "")
> +
> +AARCH64_OPT_FMV_EXTENSION("ssbs", SSBS, (), (), (), "ssbs")
> +
> +AARCH64_FMV_FEATURE("ssbs2", SSBS2, (SSBS))
> +
> +AARCH64_FMV_FEATURE("bti", BTI, ())
> +
> +AARCH64_OPT_EXTENSION("profile", PROFILE, (), (), (), "")
> +
> +AARCH64_OPT_EXTENSION("tme", TME, (), (), (), "")
>
> AARCH64_OPT_EXTENSION("pauth", PAUTH, (), (), (), "paca pacg")
>
> AARCH64_OPT_EXTENSION("ls64", LS64, (), (), (), "")
>
> -AARCH64_OPT_EXTENSION("mops", MOPS, (), (), (), "")
> +AARCH64_FMV_FEATURE("ls64", LS64, ())
>
> -AARCH64_OPT_EXTENSION("cssc", CSSC, (), (), (), "cssc")
> +AARCH64_FMV_FEATURE("ls64_v", LS64_V, ())
>
> -AARCH64_OPT_EXTENSION("sme", SME, (BF16, SVE2), (), (), "sme")
> +AARCH64_FMV_FEATURE("ls64_accdata", LS64_ACCDATA, (LS64))
>
> -AARCH64_OPT_EXTENSION("sme-i16i64", SME_I16I64, (SME), (), (), "")
> +AARCH64_FMV_FEATURE("wfxt", WFXT, ())
>
> AARCH64_OPT_EXTENSION("sme-f64f64", SME_F64F64, (SME), (), (), "")
>
> -AARCH64_OPT_EXTENSION("sme2", SME2, (SME), (), (), "sme2")
> +AARCH64_FMV_FEATURE("sme-f64f64", SME_F64, (SME_F64F64))
> +
> +AARCH64_OPT_EXTENSION("sme-i16i64", SME_I16I64, (SME), (), (), "")
> +
> +AARCH64_FMV_FEATURE("sme-i16i64", SME_I64, (SME_I16I64))
> +
> +AARCH64_OPT_FMV_EXTENSION("sme2", SME2, (SME), (), (), "sme2")
> +
> +AARCH64_OPT_EXTENSION("mops", MOPS, (), (), (), "")
> +
> +AARCH64_OPT_EXTENSION("cssc", CSSC, (), (), (), "cssc")
>
> AARCH64_OPT_EXTENSION("d128", D128, (), (), (), "d128")
>
> @@ -165,5 +281,6 @@ AARCH64_OPT_EXTENSION("the", THE, (), (), (), "the")
>
> AARCH64_OPT_EXTENSION("gcs", GCS, (), (), (), "gcs")
>
> -AARCH64_OPT_EXTENSION("rcpc3", RCPC3, (), (), (), "rcpc3")
> +#undef AARCH64_OPT_FMV_EXTENSION
> #undef AARCH64_OPT_EXTENSION
> +#undef AARCH64_FMV_FEATURE
> diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
> index 501bb7478a0755fa76c488ec03dcfab6c272851c..3ae42be770400da96ea3d9d25d6e1b2d393d034d 100644
> --- a/gcc/config/aarch64/aarch64.h
> +++ b/gcc/config/aarch64/aarch64.h
> @@ -1362,6 +1362,8 @@ extern enum aarch64_code_model aarch64_cmodel;
> (aarch64_cmodel == AARCH64_CMODEL_TINY \
> || aarch64_cmodel == AARCH64_CMODEL_TINY_PIC)
>
> +#define TARGET_HAS_FMV_TARGET_ATTRIBUTE 0
> +
> #define TARGET_SUPPORTS_WIDE_INT 1
>
> /* Modes valid for AdvSIMD D registers, i.e. that fit in half a Q register. */
> diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
> index 190608d13810b48547e479908909a6ccd30d345a..9d130c0fd86e8026fe6997c2bd134de83337db97 100644
> --- a/gcc/config/aarch64/aarch64.cc
> +++ b/gcc/config/aarch64/aarch64.cc
> @@ -85,6 +85,7 @@
> #include "aarch64-feature-deps.h"
> #include "config/arm/aarch-common.h"
> #include "config/arm/aarch-common-protos.h"
> +#include "common/config/aarch64/cpuinfo.h"
> #include "ssa.h"
> #include "except.h"
> #include "tree-pass.h"
> @@ -19340,6 +19341,8 @@ aarch64_process_target_attr (tree args)
> return true;
> }
>
> +static bool aarch64_process_target_version_attr (tree args);
> +
> /* Implement TARGET_OPTION_VALID_ATTRIBUTE_P. This is used to
> process attribute ((target ("..."))). */
>
> @@ -19395,6 +19398,20 @@ aarch64_option_valid_attribute_p (tree fndecl, tree, tree args, int)
> TREE_TARGET_OPTION (target_option_current_node));
>
> ret = aarch64_process_target_attr (args);
> + ret = aarch64_process_target_attr (args);
> + if (ret)
> + {
> + tree version_attr = lookup_attribute ("target_version",
> + DECL_ATTRIBUTES (fndecl));
> + if (version_attr != NULL_TREE)
> + {
> + /* Reapply any target_version attribute after target attribute.
> + This should be equivalent to applying the target_version once
> + after processing all target attributes. */
> + tree version_args = TREE_VALUE (version_attr);
> + ret = aarch64_process_target_version_attr (version_args);
> + }
> + }
>
> /* Set up any additional state. */
> if (ret)
> @@ -19425,6 +19442,829 @@ aarch64_option_valid_attribute_p (tree fndecl, tree, tree args, int)
> return ret;
> }
>
> +typedef unsigned long long aarch64_fmv_feature_mask;
> +
> +typedef struct
> +{
> + const char *name;
> + aarch64_fmv_feature_mask feature_mask;
> + aarch64_feature_flags opt_flags;
> +} aarch64_fmv_feature_datum;
> +
> +#define AARCH64_FMV_FEATURE(NAME, FEAT_NAME, C) \
> + {NAME, 1ULL << FEAT_##FEAT_NAME, ::feature_deps::fmv_deps_##FEAT_NAME},
> +
> +/* FMV features are listed in priority order, to make it easier to sort target
> + strings. */
> +static aarch64_fmv_feature_datum aarch64_fmv_feature_data[] = {
> +#include "config/aarch64/aarch64-option-extensions.def"
> +};
> +
> +/* Parse a function multiversioning feature string STR, as found in a
> + target_version or target_clones attribute.
> +
> + If ISA_FLAGS is nonnull, then update it with the specified architecture
> + features turned on. If FEATURE_MASK is nonnull, then assign to it a bitmask
> + representing the set of features explicitly specified in the feature string.
> + Return an aarch_parse_opt_result describing the result.
> +
> + When the STR string contains an invalid or duplicate extension, a copy of
> + the extension string is created and stored to INVALID_EXTENSION. */
> +
> +static enum aarch_parse_opt_result
> +aarch64_parse_fmv_features (const char *str, aarch64_feature_flags *isa_flags,
> + aarch64_fmv_feature_mask *feature_mask,
> + std::string *invalid_extension)
> +{
> + if (feature_mask)
> + *feature_mask = 0ULL;
> +
> + if (strcmp (str, "default") == 0)
> + return AARCH_PARSE_OK;
> +
> + while (str != NULL && *str != 0)
> + {
> + const char *ext;
> + size_t len;
> +
> + ext = strchr (str, '+');
> +
> + if (ext != NULL)
> + len = ext - str;
> + else
> + len = strlen (str);
> +
> + if (len == 0)
> + return AARCH_PARSE_MISSING_ARG;
> +
> + static const int num_features = ARRAY_SIZE (aarch64_fmv_feature_data);
> + int i;
> + for (i = 0; i < num_features; i++)
> + {
> + if (strlen (aarch64_fmv_feature_data[i].name) == len
> + && strncmp (aarch64_fmv_feature_data[i].name, str, len) == 0)
> + {
> + if (isa_flags)
> + *isa_flags |= aarch64_fmv_feature_data[i].opt_flags;
> + if (feature_mask)
> + {
> + auto old_feature_mask = *feature_mask;
> + *feature_mask |= aarch64_fmv_feature_data[i].feature_mask;
> + if (*feature_mask == old_feature_mask)
> + {
> + /* Duplicate feature. */
> + if (invalid_extension)
> + *invalid_extension = std::string (str, len);
> + return AARCH_PARSE_DUPLICATE_FEATURE;
> + }
> + }
> + break;
> + }
> + }
> +
> + if (i == num_features)
> + {
> + /* Feature not found in list. */
> + if (invalid_extension)
> + *invalid_extension = std::string (str, len);
> + return AARCH_PARSE_INVALID_FEATURE;
> + }
> +
> + str = ext;
> + if (str)
> + /* Skip over the next '+'. */
> + str++;
> + }
> +
> + return AARCH_PARSE_OK;
> +}
> +
> +/* Parse the tree in ARGS that contains the target_version attribute
> + information and update the global target options space. */
> +
> +static bool
> +aarch64_process_target_version_attr (tree args)
> +{
> + if (TREE_CODE (args) == TREE_LIST)
> + {
> + if (TREE_CHAIN (args))
> + {
> + error ("attribute %<target_version%> has multiple values");
> + return false;
> + }
> + args = TREE_VALUE (args);
> + }
> +
> + if (!args || TREE_CODE (args) != STRING_CST)
> + {
> + error ("attribute %<target_version%> argument not a string");
> + return false;
> + }
> +
> + const char *str = TREE_STRING_POINTER (args);
> +
> + enum aarch_parse_opt_result parse_res;
> + auto isa_flags = aarch64_asm_isa_flags;
> +
> + std::string invalid_extension;
> + parse_res = aarch64_parse_fmv_features (str, &isa_flags, NULL,
> + &invalid_extension);
> +
> + if (parse_res == AARCH_PARSE_OK)
> + {
> + aarch64_set_asm_isa_flags (isa_flags);
> + return true;
> + }
> +
> + switch (parse_res)
> + {
> + case AARCH_PARSE_MISSING_ARG:
> + error ("missing value in %<target_version%> attribute");
> + break;
> +
> + case AARCH_PARSE_INVALID_FEATURE:
> + error ("invalid feature modifier %qs of value %qs in "
> + "%<target_version%> attribute", invalid_extension.c_str (),
> + str);
> + break;
> +
> + case AARCH_PARSE_DUPLICATE_FEATURE:
> + error ("duplicate feature modifier %qs of value %qs in "
> + "%<target_version%> attribute", invalid_extension.c_str (),
> + str);
> + break;
> +
> + default:
> + gcc_unreachable ();
> + }
> +
> + return false;
> +}
> +
> +/* Implement TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P. This is used to
> + process attribute ((target_version ("..."))). */
> +
> +static bool
> +aarch64_option_valid_version_attribute_p (tree fndecl, tree, tree args, int)
> +{
> + struct cl_target_option cur_target;
> + bool ret;
> + tree new_target;
> + tree existing_target = DECL_FUNCTION_SPECIFIC_TARGET (fndecl);
> +
> + /* Save the current target options to restore at the end. */
> + cl_target_option_save (&cur_target, &global_options, &global_options_set);
> +
> + /* If fndecl already has some target attributes applied to it, unpack
> + them so that we add this attribute on top of them, rather than
> + overwriting them. */
> + if (existing_target)
> + {
> + struct cl_target_option *existing_options
> + = TREE_TARGET_OPTION (existing_target);
> +
> + if (existing_options)
> + cl_target_option_restore (&global_options, &global_options_set,
> + existing_options);
> + }
> + else
> + cl_target_option_restore (&global_options, &global_options_set,
> + TREE_TARGET_OPTION (target_option_current_node));
> +
> + ret = aarch64_process_target_version_attr (args);
> +
> + /* Set up any additional state. */
> + if (ret)
> + {
> + aarch64_override_options_internal (&global_options);
> + new_target = build_target_option_node (&global_options,
> + &global_options_set);
> + }
> + else
> + new_target = NULL;
> +
> + if (fndecl && ret)
> + DECL_FUNCTION_SPECIFIC_TARGET (fndecl) = new_target;
> +
> + cl_target_option_restore (&global_options, &global_options_set, &cur_target);
> +
> + return ret;
> +}
> +
> +/* This parses the attribute arguments to target_version in DECL and the
> + feature mask required to select those targets. No adjustments are made to
> + add or remove redundant feature requirements. */
> +
> +static aarch64_fmv_feature_mask
> +get_feature_mask_for_version (tree decl)
> +{
> + tree version_attr = lookup_attribute ("target_version",
> + DECL_ATTRIBUTES (decl));
> + if (version_attr == NULL)
> + return 0;
> +
> + const char *version_string = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE
> + (version_attr)));
> + enum aarch_parse_opt_result parse_res;
> + aarch64_fmv_feature_mask feature_mask;
> +
> + parse_res = aarch64_parse_fmv_features (version_string, NULL, &feature_mask,
> + NULL);
> +
> + /* We should have detected any errors before getting here. */
> + gcc_assert (parse_res == AARCH_PARSE_OK);
> +
> + return feature_mask;
> +}
> +
> +/* Compare priorities of two feature masks. Return:
> + 1: mask1 is higher priority
> + -1: mask2 is higher priority
> + 0: masks are equal. */
> +
> +static int
> +compare_feature_masks (aarch64_fmv_feature_mask mask1,
> + aarch64_fmv_feature_mask mask2)
> +{
> + int pop1 = popcount_hwi (mask1);
> + int pop2 = popcount_hwi (mask2);
> + if (pop1 > pop2)
> + return 1;
> + if (pop2 > pop1)
> + return -1;
> +
> + auto diff_mask = mask1 ^ mask2;
> + if (diff_mask == 0ULL)
> + return 0;
> + for (int i = FEAT_MAX - 1; i > 0; i--)
> + {
> + auto bit_mask = aarch64_fmv_feature_data[i].feature_mask;
> + if (diff_mask & bit_mask)
> + return (mask1 & bit_mask) ? 1 : -1;
> + }
> + gcc_unreachable();
> +}
> +
> +/* Compare priorities of two version decls. */
> +
> +int
> +aarch64_compare_version_priority (tree decl1, tree decl2)
> +{
> + auto mask1 = get_feature_mask_for_version (decl1);
> + auto mask2 = get_feature_mask_for_version (decl2);
> +
> + return compare_feature_masks (mask1, mask2);
> +}
> +
> +/* Build the struct __ifunc_arg_t type:
> +
> + struct __ifunc_arg_t
> + {
> + unsigned long _size; // Size of the struct, so it can grow.
> + unsigned long _hwcap;
> + unsigned long _hwcap2;
> + }
> + */
> +
> +static tree
> +build_ifunc_arg_type ()
> +{
> + tree ifunc_arg_type = lang_hooks.types.make_type (RECORD_TYPE);
> + tree field1 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
> + get_identifier ("_size"),
> + long_unsigned_type_node);
> + tree field2 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
> + get_identifier ("_hwcap"),
> + long_unsigned_type_node);
> + tree field3 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
> + get_identifier ("_hwcap2"),
> + long_unsigned_type_node);
> +
> + DECL_FIELD_CONTEXT (field1) = ifunc_arg_type;
> + DECL_FIELD_CONTEXT (field2) = ifunc_arg_type;
> + DECL_FIELD_CONTEXT (field3) = ifunc_arg_type;
> +
> + TYPE_FIELDS (ifunc_arg_type) = field1;
> + DECL_CHAIN (field1) = field2;
> + DECL_CHAIN (field2) = field3;
> +
> + layout_type (ifunc_arg_type);
> +
> + tree const_type = build_qualified_type (ifunc_arg_type, TYPE_QUAL_CONST);
> + tree pointer_type = build_pointer_type (const_type);
> +
> + return pointer_type;
> +}
> +
> +/* Make the resolver function decl to dispatch the versions of
> + a multi-versioned function, DEFAULT_DECL. IFUNC_ALIAS_DECL is
> + ifunc alias that will point to the created resolver. Create an
> + empty basic block in the resolver and store the pointer in
> + EMPTY_BB. Return the decl of the resolver function. */
> +
> +static tree
> +make_resolver_func (const tree default_decl,
> + const tree ifunc_alias_decl,
> + basic_block *empty_bb)
> +{
> + tree decl, type, t;
> +
> + /* Create resolver function name based on default_decl. */
> + tree decl_name = clone_function_name (default_decl, "resolver");
> + const char *resolver_name = IDENTIFIER_POINTER (decl_name);
> +
> + /* The resolver function should have signature
> + (void *) resolver (uint64_t, const __ifunc_arg_t *) */
> + type = build_function_type_list (ptr_type_node,
> + uint64_type_node,
> + build_ifunc_arg_type (),
> + NULL_TREE);
> +
> + decl = build_fn_decl (resolver_name, type);
> + SET_DECL_ASSEMBLER_NAME (decl, decl_name);
> +
> + DECL_NAME (decl) = decl_name;
> + TREE_USED (decl) = 1;
> + DECL_ARTIFICIAL (decl) = 1;
> + DECL_IGNORED_P (decl) = 1;
> + TREE_PUBLIC (decl) = 0;
> + DECL_UNINLINABLE (decl) = 1;
> +
> + /* Resolver is not external, body is generated. */
> + DECL_EXTERNAL (decl) = 0;
> + DECL_EXTERNAL (ifunc_alias_decl) = 0;
> +
> + DECL_CONTEXT (decl) = NULL_TREE;
> + DECL_INITIAL (decl) = make_node (BLOCK);
> + DECL_STATIC_CONSTRUCTOR (decl) = 0;
> +
> + if (DECL_COMDAT_GROUP (default_decl)
> + || TREE_PUBLIC (default_decl))
> + {
> + /* In this case, each translation unit with a call to this
> + versioned function will put out a resolver. Ensure it
> + is comdat to keep just one copy. */
> + DECL_COMDAT (decl) = 1;
> + make_decl_one_only (decl, DECL_ASSEMBLER_NAME (decl));
> + }
> + else
> + TREE_PUBLIC (ifunc_alias_decl) = 0;
> +
> + /* Build result decl and add to function_decl. */
> + t = build_decl (UNKNOWN_LOCATION, RESULT_DECL, NULL_TREE, ptr_type_node);
> + DECL_CONTEXT (t) = decl;
> + DECL_ARTIFICIAL (t) = 1;
> + DECL_IGNORED_P (t) = 1;
> + DECL_RESULT (decl) = t;
> +
> + /* Build parameter decls and add to function_decl. */
> + tree arg1 = build_decl (UNKNOWN_LOCATION, PARM_DECL,
> + get_identifier ("hwcap"),
> + uint64_type_node);
> + tree arg2 = build_decl (UNKNOWN_LOCATION, PARM_DECL,
> + get_identifier ("arg"),
> + build_ifunc_arg_type());
> + DECL_CONTEXT (arg1) = decl;
> + DECL_CONTEXT (arg2) = decl;
> + DECL_ARTIFICIAL (arg1) = 1;
> + DECL_ARTIFICIAL (arg2) = 1;
> + DECL_IGNORED_P (arg1) = 1;
> + DECL_IGNORED_P (arg2) = 1;
> + DECL_ARG_TYPE (arg1) = uint64_type_node;
> + DECL_ARG_TYPE (arg2) = build_ifunc_arg_type ();
> + DECL_ARGUMENTS (decl) = arg1;
> + TREE_CHAIN (arg1) = arg2;
> +
> + gimplify_function_tree (decl);
> + push_cfun (DECL_STRUCT_FUNCTION (decl));
> + *empty_bb = init_lowered_empty_function (decl, false,
> + profile_count::uninitialized ());
> +
> + cgraph_node::add_new_function (decl, true);
> + symtab->call_cgraph_insertion_hooks (cgraph_node::get_create (decl));
> +
> + pop_cfun ();
> +
> + gcc_assert (ifunc_alias_decl != NULL);
> + /* Mark ifunc_alias_decl as "ifunc" with resolver as resolver_name. */
> + DECL_ATTRIBUTES (ifunc_alias_decl)
> + = make_attribute ("ifunc", resolver_name,
> + DECL_ATTRIBUTES (ifunc_alias_decl));
> +
> + /* Create the alias for dispatch to resolver here. */
> + cgraph_node::create_same_body_alias (ifunc_alias_decl, decl);
> + return decl;
> +}
> +
> +/* This adds a condition to the basic_block NEW_BB in function FUNCTION_DECL
> + to return a pointer to VERSION_DECL if all feature bits specified in
> + FEATURE_MASK are not set in MASK_VAR. This function will be called during
> + version dispatch to decide which function version to execute. It returns
> + the basic block at the end, to which more conditions can be added. */
> +static basic_block
> +add_condition_to_bb (tree function_decl, tree version_decl,
> + aarch64_fmv_feature_mask feature_mask,
> + tree mask_var, basic_block new_bb)
> +{
> + gimple *return_stmt;
> + tree convert_expr, result_var;
> + gimple *convert_stmt;
> + gimple *if_else_stmt;
> +
> + basic_block bb1, bb2, bb3;
> + edge e12, e23;
> +
> + gimple_seq gseq;
> +
> + push_cfun (DECL_STRUCT_FUNCTION (function_decl));
> +
> + gcc_assert (new_bb != NULL);
> + gseq = bb_seq (new_bb);
> +
> + convert_expr = build1 (CONVERT_EXPR, ptr_type_node,
> + build_fold_addr_expr (version_decl));
> + result_var = create_tmp_var (ptr_type_node);
> + convert_stmt = gimple_build_assign (result_var, convert_expr);
> + return_stmt = gimple_build_return (result_var);
> +
> + if (feature_mask == 0ULL)
> + {
> + /* Default version. */
> + gimple_seq_add_stmt (&gseq, convert_stmt);
> + gimple_seq_add_stmt (&gseq, return_stmt);
> + set_bb_seq (new_bb, gseq);
> + gimple_set_bb (convert_stmt, new_bb);
> + gimple_set_bb (return_stmt, new_bb);
> + pop_cfun ();
> + return new_bb;
> + }
> +
> + tree and_expr_var = create_tmp_var (long_long_unsigned_type_node);
> + tree and_expr = build2 (BIT_AND_EXPR,
> + long_long_unsigned_type_node,
> + mask_var,
> + build_int_cst (long_long_unsigned_type_node,
> + feature_mask));
> + gimple *and_stmt = gimple_build_assign (and_expr_var, and_expr);
> + gimple_set_block (and_stmt, DECL_INITIAL (function_decl));
> + gimple_set_bb (and_stmt, new_bb);
> + gimple_seq_add_stmt (&gseq, and_stmt);
> +
> + tree zero_llu = build_int_cst (long_long_unsigned_type_node, 0);
> + if_else_stmt = gimple_build_cond (EQ_EXPR, and_expr_var, zero_llu,
> + NULL_TREE, NULL_TREE);
> + gimple_set_block (if_else_stmt, DECL_INITIAL (function_decl));
> + gimple_set_bb (if_else_stmt, new_bb);
> + gimple_seq_add_stmt (&gseq, if_else_stmt);
> +
> + gimple_seq_add_stmt (&gseq, convert_stmt);
> + gimple_seq_add_stmt (&gseq, return_stmt);
> + set_bb_seq (new_bb, gseq);
> +
> + bb1 = new_bb;
> + e12 = split_block (bb1, if_else_stmt);
> + bb2 = e12->dest;
> + e12->flags &= ~EDGE_FALLTHRU;
> + e12->flags |= EDGE_TRUE_VALUE;
> +
> + e23 = split_block (bb2, return_stmt);
> +
> + gimple_set_bb (convert_stmt, bb2);
> + gimple_set_bb (return_stmt, bb2);
> +
> + bb3 = e23->dest;
> + make_edge (bb1, bb3, EDGE_FALSE_VALUE);
> +
> + remove_edge (e23);
> + make_edge (bb2, EXIT_BLOCK_PTR_FOR_FN (cfun), 0);
> +
> + pop_cfun ();
> +
> + return bb3;
> +}
> +
> +/* This function generates the dispatch function for
> + multi-versioned functions. DISPATCH_DECL is the function which will
> + contain the dispatch logic. FNDECLS are the function choices for
> + dispatch, and is a tree chain. EMPTY_BB is the basic block pointer
> + in DISPATCH_DECL in which the dispatch code is generated. */
> +
> +static int
> +dispatch_function_versions (tree dispatch_decl,
> + void *fndecls_p,
> + basic_block *empty_bb)
> +{
> + gimple *ifunc_cpu_init_stmt;
> + gimple_seq gseq;
> + vec<tree> *fndecls;
> +
> + gcc_assert (dispatch_decl != NULL
> + && fndecls_p != NULL
> + && empty_bb != NULL);
> +
> + push_cfun (DECL_STRUCT_FUNCTION (dispatch_decl));
> +
> + gseq = bb_seq (*empty_bb);
> + /* Function version dispatch is via IFUNC. IFUNC resolvers fire before
> + constructors, so explicity call __init_cpu_features_resolver here. */
> + tree init_fn_type = build_function_type_list (void_type_node,
> + long_unsigned_type_node,
> + build_ifunc_arg_type(),
> + NULL);
> + tree init_fn_id = get_identifier ("__init_cpu_features_resolver");
> + tree init_fn_decl = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
> + init_fn_id, init_fn_type);
> + tree arg1 = DECL_ARGUMENTS (dispatch_decl);
> + tree arg2 = TREE_CHAIN (arg1);
> + ifunc_cpu_init_stmt = gimple_build_call (init_fn_decl, 2, arg1, arg2);
> + gimple_seq_add_stmt (&gseq, ifunc_cpu_init_stmt);
> + gimple_set_bb (ifunc_cpu_init_stmt, *empty_bb);
> +
> + /* Build the struct type for __aarch64_cpu_features. */
> + tree global_type = lang_hooks.types.make_type (RECORD_TYPE);
> + tree field1 = build_decl (UNKNOWN_LOCATION, FIELD_DECL,
> + get_identifier ("features"),
> + long_long_unsigned_type_node);
> + DECL_FIELD_CONTEXT (field1) = global_type;
> + TYPE_FIELDS (global_type) = field1;
> + layout_type (global_type);
> +
> + tree global_var = build_decl (UNKNOWN_LOCATION, VAR_DECL,
> + get_identifier ("__aarch64_cpu_features"),
> + global_type);
> + DECL_EXTERNAL (global_var) = 1;
> + tree mask_var = create_tmp_var (long_long_unsigned_type_node);
> +
> + tree component_expr = build3 (COMPONENT_REF, long_long_unsigned_type_node,
> + global_var, field1, NULL_TREE);
> + gimple *component_stmt = gimple_build_assign (mask_var, component_expr);
> + gimple_set_block (component_stmt, DECL_INITIAL (dispatch_decl));
> + gimple_set_bb (component_stmt, *empty_bb);
> + gimple_seq_add_stmt (&gseq, component_stmt);
> +
> + tree not_expr = build1 (BIT_NOT_EXPR, long_long_unsigned_type_node, mask_var);
> + gimple *not_stmt = gimple_build_assign (mask_var, not_expr);
> + gimple_set_block (not_stmt, DECL_INITIAL (dispatch_decl));
> + gimple_set_bb (not_stmt, *empty_bb);
> + gimple_seq_add_stmt (&gseq, not_stmt);
> +
> + set_bb_seq (*empty_bb, gseq);
> +
> + pop_cfun ();
> +
> + /* fndecls_p is actually a vector. */
> + fndecls = static_cast<vec<tree> *> (fndecls_p);
> +
> + /* At least one more version other than the default. */
> + unsigned int num_versions = fndecls->length ();
> + gcc_assert (num_versions >= 2);
> +
> + struct function_version_info
> + {
> + tree version_decl;
> + aarch64_fmv_feature_mask feature_mask;
> + } *function_versions;
> +
> + function_versions = (struct function_version_info *)
> + XNEWVEC (struct function_version_info, (num_versions));
> +
> + unsigned int actual_versions = 0;
> +
> + for (tree version_decl : *fndecls)
> + {
> + aarch64_fmv_feature_mask feature_mask;
> + /* Get attribute string, parse it and find the right features. */
> + feature_mask = get_feature_mask_for_version (version_decl);
> + function_versions [actual_versions].version_decl = version_decl;
> + function_versions [actual_versions].feature_mask = feature_mask;
> + actual_versions++;
> + }
> +
> + auto compare_feature_version_info = [](const void *p1, const void *p2) {
> + const function_version_info v1 = *(const function_version_info *)p1;
> + const function_version_info v2 = *(const function_version_info *)p2;
> + return - compare_feature_masks (v1.feature_mask, v2.feature_mask);
> + };
> +
> + /* Sort the versions according to descending order of dispatch priority. */
> + qsort (function_versions, actual_versions,
> + sizeof (struct function_version_info), compare_feature_version_info);
> +
> + for (unsigned int i = 0; i < actual_versions; ++i)
> + *empty_bb = add_condition_to_bb (dispatch_decl,
> + function_versions[i].version_decl,
> + function_versions[i].feature_mask,
> + mask_var,
> + *empty_bb);
> +
> + free (function_versions);
> + return 0;
> +}
> +
> +/* Implement TARGET_GENERATE_VERSION_DISPATCHER_BODY. */
> +
> +tree
> +aarch64_generate_version_dispatcher_body (void *node_p)
> +{
> + tree resolver_decl;
> + basic_block empty_bb;
> + tree default_ver_decl;
> + struct cgraph_node *versn;
> + struct cgraph_node *node;
> +
> + struct cgraph_function_version_info *node_version_info = NULL;
> + struct cgraph_function_version_info *versn_info = NULL;
> +
> + node = (cgraph_node *)node_p;
> +
> + node_version_info = node->function_version ();
> + gcc_assert (node->dispatcher_function
> + && node_version_info != NULL);
> +
> + if (node_version_info->dispatcher_resolver)
> + return node_version_info->dispatcher_resolver;
> +
> + /* The first version in the chain corresponds to the default version. */
> + default_ver_decl = node_version_info->next->this_node->decl;
> +
> + /* node is going to be an alias, so remove the finalized bit. */
> + node->definition = false;
> +
> + resolver_decl = make_resolver_func (default_ver_decl,
> + node->decl, &empty_bb);
> +
> + node_version_info->dispatcher_resolver = resolver_decl;
> +
> + push_cfun (DECL_STRUCT_FUNCTION (resolver_decl));
> +
> + auto_vec<tree, 2> fn_ver_vec;
> +
> + for (versn_info = node_version_info->next; versn_info;
> + versn_info = versn_info->next)
> + {
> + versn = versn_info->this_node;
> + /* Check for virtual functions here again, as by this time it should
> + have been determined if this function needs a vtable index or
> + not. This happens for methods in derived classes that override
> + virtual methods in base classes but are not explicitly marked as
> + virtual. */
> + if (DECL_VINDEX (versn->decl))
> + sorry ("virtual function multiversioning not supported");
> +
> + fn_ver_vec.safe_push (versn->decl);
> + }
> +
> + dispatch_function_versions (resolver_decl, &fn_ver_vec, &empty_bb);
> + cgraph_edge::rebuild_edges ();
> + pop_cfun ();
> + return resolver_decl;
> +}
> +
> +/* Make a dispatcher declaration for the multi-versioned function DECL.
> + Calls to DECL function will be replaced with calls to the dispatcher
> + by the front-end. Returns the decl of the dispatcher function. */
> +
> +tree
> +aarch64_get_function_versions_dispatcher (void *decl)
> +{
> + tree fn = (tree) decl;
> + struct cgraph_node *node = NULL;
> + struct cgraph_node *default_node = NULL;
> + struct cgraph_function_version_info *node_v = NULL;
> + struct cgraph_function_version_info *first_v = NULL;
> +
> + tree dispatch_decl = NULL;
> +
> + struct cgraph_function_version_info *default_version_info = NULL;
> +
> + gcc_assert (fn != NULL && DECL_FUNCTION_VERSIONED (fn));
> +
> + node = cgraph_node::get (fn);
> + gcc_assert (node != NULL);
> +
> + node_v = node->function_version ();
> + gcc_assert (node_v != NULL);
> +
> + if (node_v->dispatcher_resolver != NULL)
> + return node_v->dispatcher_resolver;
> +
> + /* Find the default version and make it the first node. */
> + first_v = node_v;
> + /* Go to the beginning of the chain. */
> + while (first_v->prev != NULL)
> + first_v = first_v->prev;
> + default_version_info = first_v;
> + while (default_version_info != NULL)
> + {
> + if (get_feature_mask_for_version
> + (default_version_info->this_node->decl) == 0ULL)
> + break;
> + default_version_info = default_version_info->next;
> + }
> +
> + /* If there is no default node, just return NULL. */
> + if (default_version_info == NULL)
> + return NULL;
> +
> + /* Make default info the first node. */
> + if (first_v != default_version_info)
> + {
> + default_version_info->prev->next = default_version_info->next;
> + if (default_version_info->next)
> + default_version_info->next->prev = default_version_info->prev;
> + first_v->prev = default_version_info;
> + default_version_info->next = first_v;
> + default_version_info->prev = NULL;
> + }
> +
> + default_node = default_version_info->this_node;
> +
> + if (targetm.has_ifunc_p ())
> + {
> + struct cgraph_function_version_info *it_v = NULL;
> + struct cgraph_node *dispatcher_node = NULL;
> + struct cgraph_function_version_info *dispatcher_version_info = NULL;
> +
> + /* Right now, the dispatching is done via ifunc. */
> + dispatch_decl = make_dispatcher_decl (default_node->decl);
> + TREE_NOTHROW (dispatch_decl) = TREE_NOTHROW (fn);
> +
> + dispatcher_node = cgraph_node::get_create (dispatch_decl);
> + gcc_assert (dispatcher_node != NULL);
> + dispatcher_node->dispatcher_function = 1;
> + dispatcher_version_info
> + = dispatcher_node->insert_new_function_version ();
> + dispatcher_version_info->next = default_version_info;
> + dispatcher_node->definition = 1;
> +
> + /* Set the dispatcher for all the versions. */
> + it_v = default_version_info;
> + while (it_v != NULL)
> + {
> + it_v->dispatcher_resolver = dispatch_decl;
> + it_v = it_v->next;
> + }
> + }
> + else
> + {
> + error_at (DECL_SOURCE_LOCATION (default_node->decl),
> + "multiversioning needs %<ifunc%> which is not supported "
> + "on this target");
> + }
> +
> + return dispatch_decl;
> +}
> +
> +/* This function returns true if FN1 and FN2 are versions of the same function,
> + that is, the target_version attributes of the function decls are different.
> + This assumes that FN1 and FN2 have the same signature. */
> +
> +bool
> +aarch64_common_function_versions (tree fn1, tree fn2)
> +{
> + if (TREE_CODE (fn1) != FUNCTION_DECL
> + || TREE_CODE (fn2) != FUNCTION_DECL)
> + return false;
> +
> + return (aarch64_compare_version_priority (fn1, fn2) != 0);
> +}
> +
> +/* Implement TARGET_MANGLE_DECL_ASSEMBLER_NAME, to add function multiversioning
> + suffixes. */
> +
> +tree
> +aarch64_mangle_decl_assembler_name (tree decl, tree id)
> +{
> + /* For function version, add the target suffix to the assembler name. */
> + if (TREE_CODE (decl) == FUNCTION_DECL
> + && DECL_FUNCTION_VERSIONED (decl))
> + {
> + aarch64_fmv_feature_mask feature_mask = get_feature_mask_for_version (decl);
> +
> + /* No suffix for the default version. */
> + if (feature_mask == 0ULL)
> + return id;
> +
> + std::string name = IDENTIFIER_POINTER (id);
> + name += "._";
> +
> + for (int i = 0; i < FEAT_MAX; i++)
> + {
> + if (feature_mask & aarch64_fmv_feature_data[i].feature_mask)
> + {
> + name += "M";
> + name += aarch64_fmv_feature_data[i].name;
> + }
> + }
> +
> + if (DECL_ASSEMBLER_NAME_SET_P (decl))
> + SET_DECL_RTL (decl, NULL);
> +
> + id = get_identifier (name.c_str());
> + }
> + return id;
> +}
> +
> /* Implement TARGET_FUNCTION_ATTRIBUTE_INLINABLE_P. Use an opt-out
> rather than an opt-in list. */
>
> @@ -29571,6 +30411,10 @@ aarch64_libgcc_floating_mode_supported_p
> #undef TARGET_OPTION_VALID_ATTRIBUTE_P
> #define TARGET_OPTION_VALID_ATTRIBUTE_P aarch64_option_valid_attribute_p
>
> +#undef TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P
> +#define TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P \
> + aarch64_option_valid_version_attribute_p
> +
> #undef TARGET_SET_CURRENT_FUNCTION
> #define TARGET_SET_CURRENT_FUNCTION aarch64_set_current_function
>
> @@ -29940,6 +30784,23 @@ aarch64_libgcc_floating_mode_supported_p
> #undef TARGET_EMIT_EPILOGUE_FOR_SIBCALL
> #define TARGET_EMIT_EPILOGUE_FOR_SIBCALL aarch64_expand_epilogue
>
> +#undef TARGET_OPTION_FUNCTION_VERSIONS
> +#define TARGET_OPTION_FUNCTION_VERSIONS aarch64_common_function_versions
> +
> +#undef TARGET_COMPARE_VERSION_PRIORITY
> +#define TARGET_COMPARE_VERSION_PRIORITY aarch64_compare_version_priority
> +
> +#undef TARGET_GENERATE_VERSION_DISPATCHER_BODY
> +#define TARGET_GENERATE_VERSION_DISPATCHER_BODY \
> + aarch64_generate_version_dispatcher_body
> +
> +#undef TARGET_GET_FUNCTION_VERSIONS_DISPATCHER
> +#define TARGET_GET_FUNCTION_VERSIONS_DISPATCHER \
> + aarch64_get_function_versions_dispatcher
> +
> +#undef TARGET_MANGLE_DECL_ASSEMBLER_NAME
> +#define TARGET_MANGLE_DECL_ASSEMBLER_NAME aarch64_mangle_decl_assembler_name
> +
> struct gcc_target targetm = TARGET_INITIALIZER;
>
> #include "gt-aarch64.h"
> diff --git a/gcc/config/arm/aarch-common.h b/gcc/config/arm/aarch-common.h
> index f72e21127fc898f5ffa10e274820fa4316fd41cf..c384291991c26b6de2c821dc4eea95b1888db398 100644
> --- a/gcc/config/arm/aarch-common.h
> +++ b/gcc/config/arm/aarch-common.h
> @@ -23,7 +23,7 @@
> #define GCC_AARCH_COMMON_H
>
> /* Enum describing the various ways that the
> - aarch*_parse_{arch,tune,cpu,extension} functions can fail.
> + aarch*_parse_{arch,tune,cpu,extension,fmv_extension} functions can fail.
> This way their callers can choose what kind of error to give. */
>
> enum aarch_parse_opt_result
> @@ -31,7 +31,8 @@ enum aarch_parse_opt_result
> AARCH_PARSE_OK, /* Parsing was successful. */
> AARCH_PARSE_MISSING_ARG, /* Missing argument. */
> AARCH_PARSE_INVALID_FEATURE, /* Invalid feature modifier. */
> - AARCH_PARSE_INVALID_ARG /* Invalid arch, tune, cpu arg. */
> + AARCH_PARSE_INVALID_ARG, /* Invalid arch, tune, cpu arg. */
> + AARCH_PARSE_DUPLICATE_FEATURE /* Duplicate feature modifier. */
> };
>
> /* Function types -msign-return-address should sign. */
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c
> index fb5a7a18ad1a2d09ac4b231150a1bd9e72d6fab6..c175e22f88fd5165d42866eb989de8af3ee5f6c6 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_0.c
> @@ -7,6 +7,6 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\n} } } */
>
> /* Test a normal looking procinfo. */
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c
> index b29d50e1f79f92e45add1627904a695c511aec75..0264a4737103ce093741d4f0b161f78cd18a0d6a 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_13.c
> @@ -7,6 +7,6 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\n} } } */
>
> /* Test one with mixed order of feature bits. */
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c
> index b3613165a05bf2fd1e93e6d89361ae9969ed62ba..649e48e7e0b727cef573ff12f1e3efb90bbb5e7f 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_16.c
> @@ -7,6 +7,6 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\+sve2\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\+sve2\n} } } */
>
> /* Test a normal looking procinfo. */
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c
> index a9dde5ffab1405488d15d58c6420890a1b16e16a..078d7bc899ccd01c70369fe985268949c351da0b 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_17.c
> @@ -7,6 +7,6 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+dotprod\+crypto\+sve2\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\+sve2\n} } } */
>
> /* Test a normal looking procinfo. */
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c
> index 10325df4497227a80297a140c9e1d689fccf96ef..57eedb463091f051c19533c054204f9352b6446e 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_18.c
> @@ -7,7 +7,7 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv8.6-a\+crc\+fp16\+aes\+sha3\+rng\+nopauth\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv8.6-a\+rng\+crc\+aes\+sha3\+fp16\+nopauth\n} } } */
>
> /* Test one where the boundary of buffer size would overwrite the last
> character read when stitching the fgets-calls together. With the
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c
> index 980d3f79dfb03b0d8eb68f691bf2dedf80aed87d..a5b4b4d3442c6522a8cdadf4eebd3b5460e37213 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_19.c
> @@ -7,7 +7,7 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+profile\+memtag\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\+nopauth\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+memtag\+profile\+nopauth\n} } } */
>
> /* Test one that if the kernel doesn't report the availability of a mandatory
> feature that it has turned it off for whatever reason. As such compilers
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c
> index 117df2b0b6cd5751d9f5175b4343aad9825a6c43..e12aa543d02924f268729f96fe1f17181287f097 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_20.c
> @@ -7,7 +7,7 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+profile\+memtag\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv9-a\+crc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+memtag\+profile\n} } } */
>
> /* Check whether features that don't have a midr name during detection are
> correctly ignored. These features shouldn't affect the native detection.
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c
> index efbd02cbdc0638db85e776f1e79043709c11df21..920e1d65711cbcb77b07441597180c0159ccabf9 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_21.c
> @@ -7,7 +7,7 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+lse\+rcpc\+rdma\+dotprod\+fp16fml\+sb\+ssbs\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\+flagm\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv8-a\+flagm\+dotprod\+rdma\+lse\+crc\+fp16fml\+rcpc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+sb\+ssbs\n} } } */
>
> /* Check that an Armv8-A core doesn't fall apart on extensions without midr
> values. */
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c
> index d431d4938265d024891b464ac3d069607b21d8e7..416a29b514ab7599a7092e26e3716ec8a50cc895 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_22.c
> @@ -7,7 +7,7 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv8-a\+crc\+lse\+rcpc\+rdma\+dotprod\+fp16fml\+sb\+ssbs\+sve2-sm4\+sve2-aes\+sve2-sha3\+sve2-bitperm\+i8mm\+bf16\+flagm\+pauth\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv8-a\+flagm\+dotprod\+rdma\+lse\+crc\+fp16fml\+rcpc\+i8mm\+bf16\+sve2-aes\+sve2-bitperm\+sve2-sha3\+sve2-sm4\+sb\+ssbs\+pauth\n} } } */
>
> /* Check that an Armv8-A core doesn't fall apart on extensions without midr
> values and that it enables optional features. */
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c
> index 20012beff7b85c14817e38437650d412ab7bb137..5d39a2d8c4da5de6ed7ec832db90ae7f625d997d 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_6.c
> @@ -7,7 +7,7 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv8-a\+fp16\+crypto\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv8-a\+crypto\+fp16\n} } } */
>
> -/* Test one where the feature bits for crypto and fp16 are given in
> - same order as declared in options file. */
> +/* Test one where the crypto and fp16 options are specified in different
> + order from what is in the options file. */
> diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c
> index 70a7e62fdffc4a908df083505c03a5fde70ce883..67c4bc2b9ea446201666c9810c779d1823a5cb9b 100644
> --- a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c
> +++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_7.c
> @@ -7,7 +7,7 @@ int main()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv8-a\+fp16\+crypto\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv8-a\+crypto\+fp16\n} } } */
>
> -/* Test one where the crypto and fp16 options are specified in different
> - order from what is in the options file. */
> +/* Test one where the feature bits for crypto and fp16 are given in
> + same order as declared in options file. */
> diff --git a/gcc/testsuite/gcc.target/aarch64/options_set_17.c b/gcc/testsuite/gcc.target/aarch64/options_set_17.c
> index 8b21e2e1a0a0d4c7daa13fc6c3e4968786474a74..b1603fbcf2a1b27c00fe2b47a8a65af551a3d726 100644
> --- a/gcc/testsuite/gcc.target/aarch64/options_set_17.c
> +++ b/gcc/testsuite/gcc.target/aarch64/options_set_17.c
> @@ -6,6 +6,6 @@ int main ()
> return 0;
> }
>
> -/* { dg-final { scan-assembler {\.arch armv8\.2-a\+crc\+dotprod\n} } } */
> +/* { dg-final { scan-assembler {\.arch armv8\.2-a\+dotprod\+crc\n} } } */
>
> /* dotprod needs to be emitted pre armv8.4. */
> diff --git a/libgcc/config/aarch64/cpuinfo.c b/libgcc/config/aarch64/cpuinfo.c
> index 634f591c194bc70048f714d7eb0ace1f2f4137ea..72185bee7cdd062e20a3e9f6f627f4120d1b2fb5 100644
> --- a/libgcc/config/aarch64/cpuinfo.c
> +++ b/libgcc/config/aarch64/cpuinfo.c
> @@ -22,6 +22,8 @@
> see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
> <http://www.gnu.org/licenses/>. */
>
> +#include "common/config/aarch64/cpuinfo.h"
> +
> #if __has_include(<sys/auxv.h>)
> #include <sys/auxv.h>
>
> @@ -38,73 +40,6 @@ typedef struct __ifunc_arg_t {
> #if __has_include(<asm/hwcap.h>)
> #include <asm/hwcap.h>
>
> -/* CPUFeatures must correspond to the same AArch64 features in aarch64.cc */
> -enum CPUFeatures {
> - FEAT_RNG,
> - FEAT_FLAGM,
> - FEAT_FLAGM2,
> - FEAT_FP16FML,
> - FEAT_DOTPROD,
> - FEAT_SM4,
> - FEAT_RDM,
> - FEAT_LSE,
> - FEAT_FP,
> - FEAT_SIMD,
> - FEAT_CRC,
> - FEAT_SHA1,
> - FEAT_SHA2,
> - FEAT_SHA3,
> - FEAT_AES,
> - FEAT_PMULL,
> - FEAT_FP16,
> - FEAT_DIT,
> - FEAT_DPB,
> - FEAT_DPB2,
> - FEAT_JSCVT,
> - FEAT_FCMA,
> - FEAT_RCPC,
> - FEAT_RCPC2,
> - FEAT_FRINTTS,
> - FEAT_DGH,
> - FEAT_I8MM,
> - FEAT_BF16,
> - FEAT_EBF16,
> - FEAT_RPRES,
> - FEAT_SVE,
> - FEAT_SVE_BF16,
> - FEAT_SVE_EBF16,
> - FEAT_SVE_I8MM,
> - FEAT_SVE_F32MM,
> - FEAT_SVE_F64MM,
> - FEAT_SVE2,
> - FEAT_SVE_AES,
> - FEAT_SVE_PMULL128,
> - FEAT_SVE_BITPERM,
> - FEAT_SVE_SHA3,
> - FEAT_SVE_SM4,
> - FEAT_SME,
> - FEAT_MEMTAG,
> - FEAT_MEMTAG2,
> - FEAT_MEMTAG3,
> - FEAT_SB,
> - FEAT_PREDRES,
> - FEAT_SSBS,
> - FEAT_SSBS2,
> - FEAT_BTI,
> - FEAT_LS64,
> - FEAT_LS64_V,
> - FEAT_LS64_ACCDATA,
> - FEAT_WFXT,
> - FEAT_SME_F64,
> - FEAT_SME_I64,
> - FEAT_SME2,
> - FEAT_RCPC3,
> - FEAT_MAX,
> - FEAT_EXT = 62, /* Reserved to indicate presence of additional features field
> - in __aarch64_cpu_features. */
> - FEAT_INIT /* Used as flag of features initialization completion. */
> -};
> -
> /* Architecture features used in Function Multi Versioning. */
> struct {
> unsigned long long features;
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2023-12-16 4:03 UTC | newest]
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2023-12-06 12:43 [PATCH v3 0/5] target_version and aarch64 function multiversioning Andrew Carlotti
2023-12-06 12:44 ` [1/5] aarch64: Add cpu feature detection to libgcc Andrew Carlotti
2023-12-06 12:45 ` [PATCH v3 2/5] c-family: Simplify attribute exclusion handling Andrew Carlotti
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2023-12-14 14:58 ` Richard Sandiford
2023-12-16 0:45 ` [committed v4 " Andrew Carlotti
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