[PATCH 28/59] x86: Use -msse2avx iff compiler supports it

[Adhemerval Zanella]

clang supports it from version 19 and onwards, but it should be gated
as an option to assembler (either with -Wa or -Xassembler).  Aadd a
test for -Wa as well if -msse2avx fully supported by the compiler.
---
 sysdeps/x86_64/configure              | 24 ++++++++++++++++++++++++
 sysdeps/x86_64/configure.ac           | 11 +++++++++++
 sysdeps/x86_64/fpu/multiarch/Makefile | 14 +++++++-------
 3 files changed, 42 insertions(+), 7 deletions(-)

diff --git a/sysdeps/x86_64/configure b/sysdeps/x86_64/configure
index 32324f62da..9dd2e4a179 100644
--- a/sysdeps/x86_64/configure
+++ b/sysdeps/x86_64/configure
@@ -210,6 +210,30 @@ fi
 config_vars="$config_vars
 enable-cet = $enable_cet"
 
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking -msse2avx" >&5
+printf %s "checking -msse2avx... " >&6; }
+if test ${libc_cv_cc_msse2avx+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e)   for opt in "-msse2avx" "-Wa,-msse2avx"; do
+    if { ac_try='${CC-cc} $CFLAGS -c -xc /dev/null -o /dev/null -c "$opt" 1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then
+      libc_cv_cc_msse2avx="$opt"; break;
+    fi
+  done
+ ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_msse2avx" >&5
+printf "%s\n" "$libc_cv_cc_msse2avx" >&6; }
+config_vars="$config_vars
+config-cflags-msse2avx = $libc_cv_cc_msse2avx"
+
 # Check if -mamx-tile works properly.
 
 cat > conftest.c <<EOF
diff --git a/sysdeps/x86_64/configure.ac b/sysdeps/x86_64/configure.ac
index a00958e219..d1bcfd7ca4 100644
--- a/sysdeps/x86_64/configure.ac
+++ b/sysdeps/x86_64/configure.ac
@@ -67,6 +67,17 @@ elif test $enable_cet = permissive; then
 fi
 LIBC_CONFIG_VAR([enable-cet], [$enable_cet])
 
+dnl Check if compiler supports -msse2avx or -Wa,-msse2avx
+AC_CACHE_CHECK(-msse2avx, libc_cv_cc_msse2avx, [dnl
+  for opt in "-msse2avx" "-Wa,-msse2avx"; do
+    if AC_TRY_COMMAND(${CC-cc} $CFLAGS -c -xc /dev/null -o /dev/null -c "$opt" 1>&AS_MESSAGE_LOG_FD); then
+      libc_cv_cc_msse2avx="$opt"; break;
+    fi
+  done
+])
+LIBC_CONFIG_VAR([config-cflags-msse2avx],
+		[$libc_cv_cc_msse2avx])
+
 # Check if -mamx-tile works properly.
 LIBC_TRY_TEST_CC_COMMAND([whether -mamx-tile works properly],
   [#include <x86intrin.h>],
diff --git a/sysdeps/x86_64/fpu/multiarch/Makefile b/sysdeps/x86_64/fpu/multiarch/Makefile
index 708b14297f..50b66509f9 100644
--- a/sysdeps/x86_64/fpu/multiarch/Makefile
+++ b/sysdeps/x86_64/fpu/multiarch/Makefile
@@ -150,13 +150,13 @@ CFLAGS-s_sin-fma4.c = -mfma4
 CFLAGS-s_tan-fma4.c = -mfma4
 CFLAGS-s_sincos-fma4.c = -mfma4
 
-CFLAGS-e_atan2-avx.c = -msse2avx -DSSE2AVX
-CFLAGS-e_exp-avx.c = -msse2avx -DSSE2AVX
-CFLAGS-e_log-avx.c = -msse2avx -DSSE2AVX
-CFLAGS-s_atan-avx.c = -msse2avx -DSSE2AVX
-CFLAGS-s_sin-avx.c = -msse2avx -DSSE2AVX
-CFLAGS-s_tan-avx.c = -msse2avx -DSSE2AVX
-CFLAGS-s_sincos-avx.c = -msse2avx -DSSE2AVX
+CFLAGS-e_atan2-avx.c = $(config-cflags-msse2avx) -DSSE2AVX
+CFLAGS-e_exp-avx.c = $(config-cflags-msse2avx) -DSSE2AVX
+CFLAGS-e_log-avx.c = $(config-cflags-msse2avx) -DSSE2AVX
+CFLAGS-s_atan-avx.c = $(config-cflags-msse2avx) -DSSE2AVX
+CFLAGS-s_sin-avx.c = $(config-cflags-msse2avx) -DSSE2AVX
+CFLAGS-s_tan-avx.c = $(config-cflags-msse2avx) -DSSE2AVX
+CFLAGS-s_sincos-avx.c = $(config-cflags-msse2avx) -DSSE2AVX
 
 CFLAGS-s_modf-sse4_1.c = -msse4.1 -fno-builtin-modff32x -fno-builtin-modff64
 CFLAGS-s_modff-sse4_1.c = -msse4.1 -fno-builtin-modff32
-- 
2.43.0