This is a v2 of
https://gcc.gnu.org/pipermail/gcc-patches/2026-January/705195.html with
feedback from Richard and Christophe addressed.
The check_effective_target_arm_v8_3a_fp16_complex_neon_ok_nocache
procedure in target-supports.exp should return a set of flags providing
all of AdvSIMD, complex numbers, and fp16 capabilities. However, to
achieve this we have to be able to overwrite the current -mfpu setting.
This means that the current empty string alternative for $flags does not
work for us. This patch splits sets of options to iterate over between
the arm and the aarch64 backend and prohibits an empty string for the
former. (This split of option sets allows us to remove the redundant
"+simd" from -march on aarch64, as simd is present on all base
architectures all the way from armv8-a.) Moreover, it changes
check_effective_target_arm_v8_3a_complex_neon_ok_nocache in a similar way,
except offering an empty string as the first alternative to try testing
with the flags that gcc was configured with.
This (together with patch 1/2) fixes the
advsimd-intrinsics/vector-complex_f16.c testcase, which was previously
being compiled with the -mfpu=neon-fp16 flag added by the .exp file
itself.
Re-tested on aarch64 by me and on arm by Christophe.
Changes from v1:
- Add "" and "-mfpu=auto" as the first alternative
in check_effective_target_arm_v8_3a{,_fp16}_complex_neon_ok,
respectively.
- Clarify the changes to -march values in the aarch64 case in the commit
message.
Co-authored-by: Richard Earnshaw <[email protected]>
gcc/testsuite/ChangeLog:
* lib/target-supports.exp:
(check_effective_target_arm_v8_3a_complex_neon_ok_nocache):
Split and fill in arm and aarch64 compile options. Remove the
cpu_unset variable.
(check_effective_target_arm_v8_3a_fp16_complex_neon_ok_nocache):
Likewise.
---
gcc/testsuite/lib/target-supports.exp | 33 ++++++++++++++++++---------
1 file changed, 22 insertions(+), 11 deletions(-)
diff --git a/gcc/testsuite/lib/target-supports.exp
b/gcc/testsuite/lib/target-supports.exp
index dbcba42629f..77399a04bc5 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -13717,27 +13717,33 @@ proc check_effective_target_inff { } {
proc check_effective_target_arm_v8_3a_complex_neon_ok_nocache { } {
global et_arm_v8_3a_complex_neon_flags
set et_arm_v8_3a_complex_neon_flags ""
- set cpu_unset ""
if { ![istarget arm*-*-*] && ![istarget aarch64*-*-*] } {
return 0;
}
if { [istarget arm*-*-*] } {
- set cpu_unset "-mcpu=unset"
+ set flag_opts {
+ ""
+ "-mcpu=unset -march=armv8.3-a+simd"
+ "-mfloat-abi=softfp -mfpu=auto -mcpu=unset -march=armv8.3-a+simd"
+ "-mfloat-abi=hard -mfpu=auto -mcpu=unset -march=armv8.3-a+simd"
+ }
+ } else {
+ set flag_opts { "" "-march=armv8.3-a" }
}
# Iterate through sets of options to find the compiler flags that
# need to be added to the -march option.
- foreach flags {"" "-mfloat-abi=softfp -mfpu=auto" "-mfloat-abi=hard
-mfpu=auto"} {
+ foreach flags $flag_opts {
if { [check_no_compiler_messages_nocache \
arm_v8_3a_complex_neon_ok assembly {
#if !defined (__ARM_FEATURE_COMPLEX)
#error "__ARM_FEATURE_COMPLEX not defined"
#endif
#include <complex.h>
- } "$flags $cpu_unset -march=armv8.3-a+simd"] } {
- set et_arm_v8_3a_complex_neon_flags "$flags $cpu_unset
-march=armv8.3-a+simd"
+ } "$flags"] } {
+ set et_arm_v8_3a_complex_neon_flags "$flags"
return 1;
}
}
@@ -13765,19 +13771,25 @@ proc add_options_for_arm_v8_3a_complex_neon { flags }
{
proc check_effective_target_arm_v8_3a_fp16_complex_neon_ok_nocache { } {
global et_arm_v8_3a_fp16_complex_neon_flags
set et_arm_v8_3a_fp16_complex_neon_flags ""
- set cpu_unset ""
if { ![istarget arm*-*-*] && ![istarget aarch64*-*-*] } {
return 0;
}
if { [istarget arm*-*-*] } {
- set cpu_unset "-mcpu=unset"
+ set flag_opts {
+ "-mfpu=auto"
+ "-mfpu=auto -mcpu=unset -march=armv8.3-a+fp16+simd"
+ "-mfloat-abi=softfp -mfpu=auto -mcpu=unset
-march=armv8.3-a+fp16+simd"
+ "-mfloat-abi=hard -mfpu=auto -mcpu=unset -march=armv8.3-a+fp16+simd"
+ }
+ } else {
+ set flag_opts { "" "-march=armv8.3-a+fp16" }
}
# Iterate through sets of options to find the compiler flags that
# need to be added to the -march option.
- foreach flags {"" "-mfloat-abi=softfp -mfpu=auto" "-mfloat-abi=hard
-mfpu=auto"} {
+ foreach flags $flag_opts {
if { [check_no_compiler_messages_nocache \
arm_v8_3a_fp16_complex_neon_ok assembly {
#if !defined (__ARM_FEATURE_COMPLEX)
@@ -13787,9 +13799,8 @@ proc
check_effective_target_arm_v8_3a_fp16_complex_neon_ok_nocache { } {
#error "__ARM_FEATURE_FP16_VECTOR_ARITHMETIC not defined"
#endif
#include <complex.h>
- } "$flags $cpu_unset -march=armv8.3-a+fp16+simd"] } {
- set et_arm_v8_3a_fp16_complex_neon_flags \
- "$flags $cpu_unset -march=armv8.3-a+fp16+simd"
+ } "$flags"] } {
+ set et_arm_v8_3a_fp16_complex_neon_flags "$flags"
return 1;
}
}
--
2.43.0
