https://gcc.gnu.org/g:c10942134fa759843ac1ed1424b86fcb8e6368ba
commit r15-1812-gc10942134fa759843ac1ed1424b86fcb8e6368ba
Author: Kyrylo Tkachov <ktkac...@nvidia.com>
Date: Thu Jun 27 16:10:41 2024 +0530
aarch64: PR target/115457 Implement missing __ARM_FEATURE_BF16 macro
The ACLE asks the user to test for __ARM_FEATURE_BF16 before using the
<arm_bf16.h> header but GCC doesn't set this up.
LLVM does, so this is an inconsistency between the compilers.
This patch enables that macro for TARGET_BF16_FP.
Bootstrapped and tested on aarch64-none-linux-gnu.
gcc/
PR target/115457
* config/aarch64/aarch64-c.cc (aarch64_update_cpp_builtins):
Define __ARM_FEATURE_BF16 for TARGET_BF16_FP.
gcc/testsuite/
PR target/115457
* gcc.target/aarch64/acle/bf16_feature.c: New test.
Signed-off-by: Kyrylo Tkachov <ktkac...@nvidia.com>
Diff:
---
gcc/config/aarch64/aarch64-c.cc | 2 ++
gcc/testsuite/gcc.target/aarch64/acle/bf16_feature.c | 10 ++++++++++
2 files changed, 12 insertions(+)
diff --git a/gcc/config/aarch64/aarch64-c.cc b/gcc/config/aarch64/aarch64-c.cc
index d042e5fbd8c..f5d70339e4e 100644
--- a/gcc/config/aarch64/aarch64-c.cc
+++ b/gcc/config/aarch64/aarch64-c.cc
@@ -252,6 +252,8 @@ aarch64_update_cpp_builtins (cpp_reader *pfile)
"__ARM_FEATURE_BF16_VECTOR_ARITHMETIC", pfile);
aarch64_def_or_undef (TARGET_BF16_FP,
"__ARM_FEATURE_BF16_SCALAR_ARITHMETIC", pfile);
+ aarch64_def_or_undef (TARGET_BF16_FP,
+ "__ARM_FEATURE_BF16", pfile);
aarch64_def_or_undef (TARGET_LS64,
"__ARM_FEATURE_LS64", pfile);
aarch64_def_or_undef (AARCH64_ISA_RCPC, "__ARM_FEATURE_RCPC", pfile);
diff --git a/gcc/testsuite/gcc.target/aarch64/acle/bf16_feature.c
b/gcc/testsuite/gcc.target/aarch64/acle/bf16_feature.c
new file mode 100644
index 00000000000..96584b4b988
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/acle/bf16_feature.c
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+
+#pragma GCC target "+bf16"
+#ifndef __ARM_FEATURE_BF16
+#error "__ARM_FEATURE_BF16 is not defined but should be!"
+#endif
+
+void
+foo (void) {}
+
