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* [PATCH] arm: Add +nomve and +nomve.fp options to -mcpu=cortex-m55
@ 2020-08-10 14:21 Joe Ramsay
  2020-08-18 16:04 ` Richard Earnshaw
  0 siblings, 1 reply; 2+ messages in thread
From: Joe Ramsay @ 2020-08-10 14:21 UTC (permalink / raw)
  To: joe.ramsay, gcc-patches

From: Joe Ramsay <Joe.Ramsay@arm.com>

Hi,

This patch rearranges feature bits for MVE and FP to implement the
following flags for -mcpu=cortex-m55.

  - +nomve:    equivalent to armv8.1-m.main+fp.dp+dsp.
  - +nomve.fp: equivalent to armv8.1-m.main+mve+fp.dp (+dsp is implied by +mve).
  - +nofp:     equivalent to armv8.1-m.main+mve (+dsp is implied by +mve).
  - +nodsp:    equivalent to armv8.1-m.main+fp.dp.

Combinations of the above:

  - +nomve+nofp: equivalent to armv8.1-m.main+dsp.
  - +nodsp+nofp: equivalent to armv8.1-m.main.

Due to MVE and FP sharing vfp_base, some new syntax was required in the CPU
description to implement the concept of 'implied bits'. These are non-named
features added to the ISA late, depending on whether one or more features which
depend on them are present. This means vfp_base can be present when only one of
MVE and FP is removed, but absent when both are removed.

Bootstrapped and tested on arm-none-eabi. OK for master?

Thanks all!
Joe

gcc/ChangeLog:

2020-07-31  Joe Ramsay  <joe.ramsay@arm.com>

	* config/arm/arm-cpus.in:
	(ALL_FPU_INTERNAL): Remove vfp_base.
	(VFPv2): Remove vfp_base.
	(MVE): Remove vfp_base.
	(vfp_base): Redefine as implied bit dependent on MVE or FP
	(cortex-m55): Add flags to disable MVE, MVE FP, FP and DSP extensions.
	* config/arm/arm.c (arm_configure_build_target): Add implied bits to ISA.
	* config/arm/parsecpu.awk:
	(gen_isa): Print implied bits and their dependencies to ISA header.
	(gen_data): Add parsing for implied feature bits.

gcc/testsuite/ChangeLog:

2020-07-31  Joe Ramsay  <joe.ramsay@arm.com>

	* gcc.target/arm/cortex-m55-nodsp-flag.c: New test.
	* gcc.target/arm/cortex-m55-nodsp-nofp-flag.c: New test.
	* gcc.target/arm/cortex-m55-nofp-flag.c: New test.
	* gcc.target/arm/cortex-m55-nofp-nomve-flag.c: New test.
	* gcc.target/arm/cortex-m55-nomve-flag.c: New test.
	* gcc.target/arm/cortex-m55-nomve.fp-flag.c: New test.
---
 gcc/config/arm/arm-cpus.in                         | 26 ++++++++---
 gcc/config/arm/arm.c                               | 14 ++++++
 gcc/config/arm/parsecpu.awk                        | 51 ++++++++++++++++++++++
 .../gcc.target/arm/cortex-m55-nodsp-flag-hard.c    | 15 +++++++
 .../gcc.target/arm/cortex-m55-nodsp-flag-softfp.c  | 15 +++++++
 .../arm/cortex-m55-nodsp-nofp-flag-softfp.c        | 15 +++++++
 .../gcc.target/arm/cortex-m55-nofp-flag-hard.c     | 15 +++++++
 .../gcc.target/arm/cortex-m55-nofp-flag-softfp.c   | 15 +++++++
 .../arm/cortex-m55-nofp-nomve-flag-softfp.c        | 15 +++++++
 .../gcc.target/arm/cortex-m55-nomve-flag-hard.c    | 15 +++++++
 .../gcc.target/arm/cortex-m55-nomve-flag-softfp.c  | 15 +++++++
 .../gcc.target/arm/cortex-m55-nomve.fp-flag-hard.c | 15 +++++++
 .../arm/cortex-m55-nomve.fp-flag-softfp.c          | 15 +++++++
 13 files changed, 234 insertions(+), 7 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-flag-hard.c
 create mode 100644 gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-flag-softfp.c
 create mode 100644 gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-nofp-flag-softfp.c
 create mode 100644 gcc/testsuite/gcc.target/arm/cortex-m55-nofp-flag-hard.c
 create mode 100644 gcc/testsuite/gcc.target/arm/cortex-m55-nofp-flag-softfp.c
 create mode 100644 gcc/testsuite/gcc.target/arm/cortex-m55-nofp-nomve-flag-softfp.c
 create mode 100644 gcc/testsuite/gcc.target/arm/cortex-m55-nomve-flag-hard.c
 create mode 100644 gcc/testsuite/gcc.target/arm/cortex-m55-nomve-flag-softfp.c
 create mode 100644 gcc/testsuite/gcc.target/arm/cortex-m55-nomve.fp-flag-hard.c
 create mode 100644 gcc/testsuite/gcc.target/arm/cortex-m55-nomve.fp-flag-softfp.c

diff --git a/gcc/config/arm/arm-cpus.in b/gcc/config/arm/arm-cpus.in
index c98f8ed..5083028 100644
--- a/gcc/config/arm/arm-cpus.in
+++ b/gcc/config/arm/arm-cpus.in
@@ -135,10 +135,6 @@ define feature armv8_1m_main
 # Floating point and Neon extensions.
 # VFPv1 is not supported in GCC.
 
-# This feature bit is enabled for all VFP, MVE and
-# MVE with floating point extensions.
-define feature vfp_base
-
 # Vector floating point v2.
 define feature vfpv2
 
@@ -251,7 +247,7 @@ define fgroup ALL_SIMD	ALL_SIMD_INTERNAL ALL_SIMD_EXTERNAL
 
 # List of all FPU bits to strip out if -mfpu is used to override the
 # default.  fp16 is deliberately missing from this list.
-define fgroup ALL_FPU_INTERNAL	vfp_base vfpv2 vfpv3 vfpv4 fpv5 fp16conv fp_dbl ALL_SIMD_INTERNAL
+define fgroup ALL_FPU_INTERNAL	vfpv2 vfpv3 vfpv4 fpv5 fp16conv fp_dbl ALL_SIMD_INTERNAL
 # Similarly, but including fp16 and other extensions that aren't part of
 # -mfpu support.
 define fgroup ALL_FPU_EXTERNAL fp16 bf16
@@ -296,11 +292,11 @@ define fgroup ARMv8r      ARMv8a
 define fgroup ARMv8_1m_main ARMv8m_main armv8_1m_main
 
 # Useful combinations.
-define fgroup VFPv2	vfp_base vfpv2
+define fgroup VFPv2	vfpv2
 define fgroup VFPv3	VFPv2 vfpv3
 define fgroup VFPv4	VFPv3 vfpv4 fp16conv
 define fgroup FPv5	VFPv4 fpv5
-define fgroup MVE      mve vfp_base armv7em
+define fgroup MVE      mve armv7em
 define fgroup MVE_FP   MVE FPv5 fp16 mve_float
 
 define fgroup FP_DBL	fp_dbl
@@ -310,6 +306,18 @@ define fgroup NEON	FP_D32 neon
 define fgroup CRYPTO	NEON crypto
 define fgroup DOTPROD	NEON dotprod
 
+# Implied feature bits.  These are for non-named features shared between fgroups.
+# Shared feature f belonging to fgroups A and B will be erroneously removed if:
+# A and B are enabled by default AND A is disabled by a removal flag.
+# To ensure that f is retained, we must add such bits to the ISA after
+# processing the removal flags.  This is implemented by 'implied bits':
+# define implied <name> [<feature-or-fgroup>]+
+# This indicates that, if any of the listed features are enabled, or if any
+# member of a listed fgroup is enabled, then <name> will be implicitly enabled.
+
+# Enabled for all VFP, MVE and MVE with floating point extensions.
+define implied vfp_base MVE MVE_FP ALL_FP
+
 # List of all quirk bits to strip out when comparing CPU features with
 # architectures.
 # xscale isn't really a 'quirk', but it isn't an architecture either and we
@@ -1508,6 +1516,10 @@ begin cpu cortex-m55
  cname cortexm55
  tune flags LDSCHED
  architecture armv8.1-m.main+mve.fp+fp.dp
+ option nomve.fp remove mve_float
+ option nomve remove mve mve_float
+ option nofp remove ALL_FP mve_float
+ option nodsp remove MVE mve_float
  isa quirk_no_asmcpu
  costs v7m
  vendor 41
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index dd78141..dc03c7a 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -3410,6 +3410,20 @@ arm_configure_build_target (struct arm_build_target *target,
       bitmap_ior (target->isa, target->isa, fpu_bits);
     }
 
+  /* There may be implied bits which we still need to enable. These are
+     non-named features which are needed to complete other sets of features,
+     but cannot be enabled from arm-cpus.in due to being shared between
+     multiple fgroups. Each entry in all_implied_fbits is of the form
+     ante -> cons, meaning that if the feature "ante" is enabled, we should
+     implicitly enable "cons".  */
+  const struct fbit_implication *impl = all_implied_fbits;
+  while (impl->ante)
+    {
+      if (bitmap_bit_p (target->isa, impl->ante))
+	bitmap_set_bit (target->isa, impl->cons);
+      impl++;
+    }
+
   if (!arm_selected_tune)
     arm_selected_tune = arm_selected_cpu;
   else /* Validate the features passed to -mtune.  */
diff --git a/gcc/config/arm/parsecpu.awk b/gcc/config/arm/parsecpu.awk
index 7fc3754..9423e8a 100644
--- a/gcc/config/arm/parsecpu.awk
+++ b/gcc/config/arm/parsecpu.awk
@@ -190,6 +190,23 @@ function gen_isa () {
 	ORS = z
 	print "\n"
     }
+
+    print "struct fbit_implication {"
+    print "  /* Represents a feature implication, where:"
+    print "     ante IMPLIES cons"
+    print "     meaning that if ante is enabled then we should"
+    print "     also implicitly enable cons.  */"
+    print "  enum isa_feature ante;"
+    print "  enum isa_feature cons;"
+    print "};\n"
+    print "static const struct fbit_implication all_implied_fbits[] ="
+    print "{"
+    for (impl in implied_bits) {
+      split (impl, impl_parts, SUBSEP)
+      print "  { isa_bit_" impl_parts[2] ", isa_bit_" impl_parts[1] " },"
+    }
+    print "  { isa_nobit, isa_nobit }"
+    print "};\n"
 }
 
 function gen_data () {
@@ -600,6 +617,40 @@ BEGIN {
     parse_ok = 1
 }
 
+/^define implied / {
+  if (NF < 4) fatal("syntax: define implied <name> [<feature-or-fgroup>]+\n" \
+		    "Implied bits must be defined with at least one antecedent.")
+  toplevel()
+  fbit = $3
+  if (fbit in features) fatal("implied feature " fbit " aliases a real feature")
+  if (fbit in fgroup) fatal("implied feature " fbit " aliases a feature group")
+  fcount = NF
+  features[fbit] = 1
+  for (n = 4; n <= fcount; n++) {
+    ante = $n
+    if (fbit == ante) fatal("feature cannot imply itself")
+    else if (ante in features) {
+      for (impl in implied_bits) {
+	split(impl, impl_sep, SUBSEP)
+	if (ante == impl_sep[1])
+	  fatal(ante " implies implied bit " fbit		\
+		". Chained implications not currently supported")
+      }
+      implied_bits[fbit, ante] = 1
+    } else if (ante in fgroup) {
+      for (bitcomb in fgrp_bits) {
+	split(bitcomb, bitsep, SUBSEP)
+	if (bitsep[1] == ante) {
+	  implied_bits[fbit, bitsep[2]] = 1
+	}
+      }
+    } else {
+      fatal("implied bit antecedent " ante " unrecognized")
+    }
+  }
+  parse_ok = 1
+}
+
 /^begin fpu / {
     if (NF != 3) fatal("syntax: begin fpu <name>")
     toplevel()
diff --git a/gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-flag-hard.c b/gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-flag-hard.c
new file mode 100644
index 0000000..b3c7fd0
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-flag-hard.c
@@ -0,0 +1,15 @@
+/* { dg-do assemble } */
+/* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
+/* { dg-additional-options "-mcpu=cortex-m55+nodsp -mfloat-abi=hard -mfpu=auto --save-temps" } */
+/* { dg-final { scan-assembler "\.arch_extension fp" } } */
+/* { dg-final { scan-assembler "\.arch_extension fp.dp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension dsp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve.fp" } } */
+/* { dg-final { scan-assembler "\.fpu fpv5-d16" } } */
+
+int
+f ()
+{
+  return 1;
+}
diff --git a/gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-flag-softfp.c b/gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-flag-softfp.c
new file mode 100644
index 0000000..3806554
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-flag-softfp.c
@@ -0,0 +1,15 @@
+/* { dg-do assemble } */
+/* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
+/* { dg-additional-options "-mcpu=cortex-m55+nodsp -mfloat-abi=softfp -mfpu=auto --save-temps" } */
+/* { dg-final { scan-assembler "\.arch_extension fp" } } */
+/* { dg-final { scan-assembler "\.arch_extension fp.dp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension dsp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve.fp" } } */
+/* { dg-final { scan-assembler "\.fpu fpv5-d16" } } */
+
+int
+f ()
+{
+  return 1;
+}
diff --git a/gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-nofp-flag-softfp.c b/gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-nofp-flag-softfp.c
new file mode 100644
index 0000000..d22eb4e
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cortex-m55-nodsp-nofp-flag-softfp.c
@@ -0,0 +1,15 @@
+/* { dg-do assemble } */
+/* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
+/* { dg-additional-options "-mcpu=cortex-m55+nodsp+nofp -mfloat-abi=softfp -mfpu=auto --save-temps" } */
+/* { dg-final { scan-assembler-not "\.arch_extension fp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension fp.dp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension dsp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve.fp" } } */
+/* { dg-final { scan-assembler "\.fpu softvfp" } } */
+
+int
+f ()
+{
+  return 1;
+}
diff --git a/gcc/testsuite/gcc.target/arm/cortex-m55-nofp-flag-hard.c b/gcc/testsuite/gcc.target/arm/cortex-m55-nofp-flag-hard.c
new file mode 100644
index 0000000..da1cc25
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cortex-m55-nofp-flag-hard.c
@@ -0,0 +1,15 @@
+/* { dg-do assemble } */
+/* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
+/* { dg-additional-options "-mcpu=cortex-m55+nofp -mfloat-abi=hard -mfpu=auto --save-temps" } */
+/* { dg-final { scan-assembler "\.arch_extension mve" } } */
+/* { dg-final { scan-assembler "\.arch_extension dsp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension fp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension fp.dp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve.fp" } } */
+/* { dg-final { scan-assembler-not "\.fpu" } } */
+
+int
+f ()
+{
+  return 1;
+}
diff --git a/gcc/testsuite/gcc.target/arm/cortex-m55-nofp-flag-softfp.c b/gcc/testsuite/gcc.target/arm/cortex-m55-nofp-flag-softfp.c
new file mode 100644
index 0000000..0a4fb14
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cortex-m55-nofp-flag-softfp.c
@@ -0,0 +1,15 @@
+/* { dg-do assemble } */
+/* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
+/* { dg-additional-options "-mcpu=cortex-m55+nofp -mfloat-abi=softfp -mfpu=auto --save-temps" } */
+/* { dg-final { scan-assembler "\.arch_extension mve" } } */
+/* { dg-final { scan-assembler "\.arch_extension dsp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension fp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension fp.dp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve.fp" } } */
+/* { dg-final { scan-assembler-not "\.fpu" } } */
+
+int
+f ()
+{
+  return 1;
+}
diff --git a/gcc/testsuite/gcc.target/arm/cortex-m55-nofp-nomve-flag-softfp.c b/gcc/testsuite/gcc.target/arm/cortex-m55-nofp-nomve-flag-softfp.c
new file mode 100644
index 0000000..2ae7f34
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cortex-m55-nofp-nomve-flag-softfp.c
@@ -0,0 +1,15 @@
+/* { dg-do assemble } */
+/* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
+/* { dg-additional-options "-mcpu=cortex-m55+nomve+nofp -mfloat-abi=softfp -mfpu=auto --save-temps" } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve.fp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension fp" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension fp.dp" } } */
+/* { dg-final { scan-assembler "\.arch_extension dsp" } } */
+/* { dg-final { scan-assembler-not "\.fpu" } } */
+
+int
+f ()
+{
+  return 1;
+}
diff --git a/gcc/testsuite/gcc.target/arm/cortex-m55-nomve-flag-hard.c b/gcc/testsuite/gcc.target/arm/cortex-m55-nomve-flag-hard.c
new file mode 100644
index 0000000..a6ccd7b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cortex-m55-nomve-flag-hard.c
@@ -0,0 +1,15 @@
+/* { dg-do assemble } */
+/* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
+/* { dg-additional-options "-mcpu=cortex-m55+nomve -mfloat-abi=hard -mfpu=auto --save-temps" } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve" } } */
+/* { dg-final { scan-assembler "\.arch_extension dsp" } } */
+/* { dg-final { scan-assembler "\.arch_extension fp" } } */
+/* { dg-final { scan-assembler "\.arch_extension fp.dp" } } */
+/* { dg-final { scan-assembler "\.fpu fpv5-d16" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve.fp" } } */
+
+int
+f ()
+{
+  return 1;
+}
diff --git a/gcc/testsuite/gcc.target/arm/cortex-m55-nomve-flag-softfp.c b/gcc/testsuite/gcc.target/arm/cortex-m55-nomve-flag-softfp.c
new file mode 100644
index 0000000..2ad976a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cortex-m55-nomve-flag-softfp.c
@@ -0,0 +1,15 @@
+/* { dg-do assemble } */
+/* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
+/* { dg-additional-options "-mcpu=cortex-m55+nomve -mfloat-abi=softfp -mfpu=auto --save-temps" } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve" } } */
+/* { dg-final { scan-assembler "\.arch_extension dsp" } } */
+/* { dg-final { scan-assembler "\.arch_extension fp" } } */
+/* { dg-final { scan-assembler "\.arch_extension fp.dp" } } */
+/* { dg-final { scan-assembler "\.fpu fpv5-d16" } } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve.fp" } } */
+
+int
+f ()
+{
+  return 1;
+}
diff --git a/gcc/testsuite/gcc.target/arm/cortex-m55-nomve.fp-flag-hard.c b/gcc/testsuite/gcc.target/arm/cortex-m55-nomve.fp-flag-hard.c
new file mode 100644
index 0000000..40d54b8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cortex-m55-nomve.fp-flag-hard.c
@@ -0,0 +1,15 @@
+/* { dg-do assemble } */
+/* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
+/* { dg-additional-options "-mcpu=cortex-m55+nomve.fp -mfloat-abi=hard -mfpu=auto --save-temps" } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve.fp" } } */
+/* { dg-final { scan-assembler "\.arch_extension mve" } } */
+/* { dg-final { scan-assembler "\.arch_extension dsp" } } */
+/* { dg-final { scan-assembler "\.arch_extension fp" } } */
+/* { dg-final { scan-assembler "\.arch_extension fp.dp" } } */
+/* { dg-final { scan-assembler "\.fpu fpv5-d16" } } */
+
+int
+f ()
+{
+  return 1;
+}
diff --git a/gcc/testsuite/gcc.target/arm/cortex-m55-nomve.fp-flag-softfp.c b/gcc/testsuite/gcc.target/arm/cortex-m55-nomve.fp-flag-softfp.c
new file mode 100644
index 0000000..c726803
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cortex-m55-nomve.fp-flag-softfp.c
@@ -0,0 +1,15 @@
+/* { dg-do assemble } */
+/* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
+/* { dg-additional-options "-mcpu=cortex-m55+nomve.fp -mfloat-abi=softfp -mfpu=auto --save-temps" } */
+/* { dg-final { scan-assembler-not "\.arch_extension mve.fp" } } */
+/* { dg-final { scan-assembler "\.arch_extension mve" } } */
+/* { dg-final { scan-assembler "\.arch_extension dsp" } } */
+/* { dg-final { scan-assembler "\.arch_extension fp" } } */
+/* { dg-final { scan-assembler "\.arch_extension fp.dp" } } */
+/* { dg-final { scan-assembler "\.fpu fpv5-d16" } } */
+
+int
+f ()
+{
+  return 1;
+}
-- 
2.7.4


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as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).