[gcc r12-8850] aarch64: Define __ARM_FEATURE_RCPC

[gcc r12-8850] aarch64: Define __ARM_FEATURE_RCPC

[Richard Sandiford]

https://gcc.gnu.org/g:40a727379f3e8e6a83aea4e94c38dfa5dd8ef33d

commit r12-8850-g40a727379f3e8e6a83aea4e94c38dfa5dd8ef33d
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Thu Oct 20 15:34:08 2022 +0100

    aarch64: Define __ARM_FEATURE_RCPC
    
    https://github.com/ARM-software/acle/pull/199 adds a new feature
    macro for RCPC, for use in things like inline assembly.  This patch
    adds the associated support to GCC.
    
    Also, RCPC is required for Armv8.3-A and later, but the armv8.3-a
    entry didn't include it.  This was probably harmless in practice
    since GCC simply ignored the extension until now.  (The GAS
    definition is OK.)
    
    gcc/
            * config/aarch64/aarch64.h (AARCH64_FL_FOR_ARCH8_3): Add
            AARCH64_FL_RCPC.
            (AARCH64_ISA_RCPC): New macro.
            * config/aarch64/aarch64-cores.def (thunderx3t110, zeus, neoverse-v1)
            (neoverse-512tvb, saphira): Remove RCPC from these Armv8.3-A+ cores.
            * config/aarch64/aarch64-c.cc (aarch64_update_cpp_builtins): Define
            __ARM_FEATURE_RCPC when appropriate.
    
    gcc/testsuite/
            * gcc.target/aarch64/pragma_cpp_predefs_1.c: Add RCPC tests.

Diff:
---
 gcc/config/aarch64/aarch64-c.cc                      |  1 +
 gcc/config/aarch64/aarch64-cores.def                 | 10 +++++-----
 gcc/config/aarch64/aarch64.h                         |  4 +++-
 .../gcc.target/aarch64/pragma_cpp_predefs_1.c        | 20 ++++++++++++++++++++
 4 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/gcc/config/aarch64/aarch64-c.cc b/gcc/config/aarch64/aarch64-c.cc
index 767ee0c763c..a4c407724a7 100644
--- a/gcc/config/aarch64/aarch64-c.cc
+++ b/gcc/config/aarch64/aarch64-c.cc
@@ -202,6 +202,7 @@ aarch64_update_cpp_builtins (cpp_reader *pfile)
 			"__ARM_FEATURE_BF16_SCALAR_ARITHMETIC", pfile);
   aarch64_def_or_undef (TARGET_LS64,
 			"__ARM_FEATURE_LS64", pfile);
+  aarch64_def_or_undef (AARCH64_ISA_RCPC, "__ARM_FEATURE_RCPC", pfile);
 
   /* Not for ACLE, but required to keep "float.h" correct if we switch
      target between implementations that do or do not support ARMv8.2-A
diff --git a/gcc/config/aarch64/aarch64-cores.def b/gcc/config/aarch64/aarch64-cores.def
index 0402bfb748f..8da254f6924 100644
--- a/gcc/config/aarch64/aarch64-cores.def
+++ b/gcc/config/aarch64/aarch64-cores.def
@@ -133,17 +133,17 @@ AARCH64_CORE("tsv110",  tsv110, tsv110, 8_2A,  AARCH64_FL_FOR_ARCH8_2 | AARCH64_
 /* ARMv8.3-A Architecture Processors.  */
 
 /* Marvell cores (TX3). */
-AARCH64_CORE("thunderx3t110",  thunderx3t110,  thunderx3t110, 8_3A,  AARCH64_FL_FOR_ARCH8_3 | AARCH64_FL_CRYPTO | AARCH64_FL_RCPC | AARCH64_FL_SM4 | AARCH64_FL_SHA3 | AARCH64_FL_F16FML | AARCH64_FL_RCPC8_4, thunderx3t110, 0x43, 0x0b8, 0x0a)
+AARCH64_CORE("thunderx3t110",  thunderx3t110,  thunderx3t110, 8_3A,  AARCH64_FL_FOR_ARCH8_3 | AARCH64_FL_CRYPTO | AARCH64_FL_SM4 | AARCH64_FL_SHA3 | AARCH64_FL_F16FML | AARCH64_FL_RCPC8_4, thunderx3t110, 0x43, 0x0b8, 0x0a)
 
 /* ARMv8.4-A Architecture Processors.  */
 
 /* Arm ('A') cores.  */
-AARCH64_CORE("zeus", zeus, cortexa57, 8_4A,  AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_SVE | AARCH64_FL_RCPC | AARCH64_FL_I8MM | AARCH64_FL_BF16 | AARCH64_FL_F16 | AARCH64_FL_PROFILE | AARCH64_FL_SSBS | AARCH64_FL_RNG, neoversev1, 0x41, 0xd40, -1)
-AARCH64_CORE("neoverse-v1", neoversev1, cortexa57, 8_4A,  AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_SVE | AARCH64_FL_RCPC | AARCH64_FL_I8MM | AARCH64_FL_BF16 | AARCH64_FL_F16 | AARCH64_FL_PROFILE | AARCH64_FL_SSBS | AARCH64_FL_RNG, neoversev1, 0x41, 0xd40, -1)
-AARCH64_CORE("neoverse-512tvb", neoverse512tvb, cortexa57, 8_4A,  AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_SVE | AARCH64_FL_RCPC | AARCH64_FL_I8MM | AARCH64_FL_BF16 | AARCH64_FL_F16 | AARCH64_FL_PROFILE | AARCH64_FL_SSBS | AARCH64_FL_RNG, neoverse512tvb, INVALID_IMP, INVALID_CORE, -1)
+AARCH64_CORE("zeus", zeus, cortexa57, 8_4A,  AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_SVE | AARCH64_FL_I8MM | AARCH64_FL_BF16 | AARCH64_FL_F16 | AARCH64_FL_PROFILE | AARCH64_FL_SSBS | AARCH64_FL_RNG, neoversev1, 0x41, 0xd40, -1)
+AARCH64_CORE("neoverse-v1", neoversev1, cortexa57, 8_4A,  AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_SVE | AARCH64_FL_I8MM | AARCH64_FL_BF16 | AARCH64_FL_F16 | AARCH64_FL_PROFILE | AARCH64_FL_SSBS | AARCH64_FL_RNG, neoversev1, 0x41, 0xd40, -1)
+AARCH64_CORE("neoverse-512tvb", neoverse512tvb, cortexa57, 8_4A,  AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_SVE | AARCH64_FL_I8MM | AARCH64_FL_BF16 | AARCH64_FL_F16 | AARCH64_FL_PROFILE | AARCH64_FL_SSBS | AARCH64_FL_RNG, neoverse512tvb, INVALID_IMP, INVALID_CORE, -1)
 
 /* Qualcomm ('Q') cores. */
-AARCH64_CORE("saphira",     saphira,    saphira,    8_4A,  AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_CRYPTO | AARCH64_FL_RCPC, saphira,   0x51, 0xC01, -1)
+AARCH64_CORE("saphira",     saphira,    saphira,    8_4A,  AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_CRYPTO, saphira,   0x51, 0xC01, -1)
 
 /* ARMv8-A big.LITTLE implementations.  */
 
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index 359b6e8561f..3e308ad6239 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -260,7 +260,8 @@ extern unsigned aarch64_architecture_version;
 #define AARCH64_FL_FOR_ARCH8_2			\
   (AARCH64_FL_FOR_ARCH8_1 | AARCH64_FL_V8_2)
 #define AARCH64_FL_FOR_ARCH8_3			\
-  (AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_V8_3 | AARCH64_FL_PAUTH)
+  (AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_V8_3 | AARCH64_FL_PAUTH \
+   | AARCH64_FL_RCPC)
 #define AARCH64_FL_FOR_ARCH8_4			\
   (AARCH64_FL_FOR_ARCH8_3 | AARCH64_FL_V8_4 | AARCH64_FL_F16FML \
    | AARCH64_FL_DOTPROD | AARCH64_FL_RCPC8_4 | AARCH64_FL_FLAGM)
@@ -305,6 +306,7 @@ extern unsigned aarch64_architecture_version;
 #define AARCH64_ISA_SM4	           (aarch64_isa_flags & AARCH64_FL_SM4)
 #define AARCH64_ISA_SHA3	   (aarch64_isa_flags & AARCH64_FL_SHA3)
 #define AARCH64_ISA_F16FML	   (aarch64_isa_flags & AARCH64_FL_F16FML)
+#define AARCH64_ISA_RCPC	   (aarch64_isa_flags & AARCH64_FL_RCPC)
 #define AARCH64_ISA_RCPC8_4	   (aarch64_isa_flags & AARCH64_FL_RCPC8_4)
 #define AARCH64_ISA_RNG		   (aarch64_isa_flags & AARCH64_FL_RNG)
 #define AARCH64_ISA_V8_5	   (aarch64_isa_flags & AARCH64_FL_V8_5)
diff --git a/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_1.c b/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_1.c
index bfb044f5d14..307fa3d67da 100644
--- a/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_1.c
+++ b/gcc/testsuite/gcc.target/aarch64/pragma_cpp_predefs_1.c
@@ -248,6 +248,26 @@
 #error "__ARM_FEATURE_CRC32 is not defined but should be!"
 #endif
 
+#pragma GCC target ("arch=armv8.2-a")
+#ifdef __ARM_FEATURE_RCPC
+#error "__ARM_FEATURE_RCPC is defined but should not be!"
+#endif
+
+#pragma GCC target ("arch=armv8.2-a+rcpc")
+#ifndef __ARM_FEATURE_RCPC
+#error "__ARM_FEATURE_RCPC is not defined but should be!"
+#endif
+
+#pragma GCC target ("+norcpc")
+#ifdef __ARM_FEATURE_RCPC
+#error "__ARM_FEATURE_RCPC is defined but should not be!"
+#endif
+
+#pragma GCC target ("arch=armv8.3-a")
+#ifndef __ARM_FEATURE_RCPC
+#error "__ARM_FEATURE_RCPC is not defined but should be!"
+#endif
+
 int
 foo (int a)
 {