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x86: Properly set x86 minimum ISA level [BZ #31883]

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Properly set libc_cv_have_x86_isa_level in shell for MINIMUM_X86_ISA_LEVEL
defined as

(__X86_ISA_V1 + __X86_ISA_V2 + __X86_ISA_V3 + __X86_ISA_V4)

Also set __X86_ISA_V2 to 1 for i386 if __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
is defined.  There are no changes in config.h nor in config.make on x86-64.
On i386, -march=x86-64-v2 with GCC generates

 #define MINIMUM_X86_ISA_LEVEL 2

in config.h and

have-x86-isa-level = 2

in config.make.  This fixes BZ #31883.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
This commit is contained in:
H.J. Lu 2024-06-11 20:14:56 -07:00
parent 8859607eaa
commit 29807a271e
3 changed files with 17 additions and 3 deletions
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4
sysdeps/x86/configure vendored
View File

@ -141,8 +141,10 @@ libc_cv_have_x86_isa_level=3
libc_cv_have_x86_isa_level=2
#elif defined __x86_64__
libc_cv_have_x86_isa_level=baseline
#elif MINIMUM_X86_ISA_LEVEL == 1
libc_cv_have_x86_isa_level=1
#else
libc_cv_have_x86_isa_level=MINIMUM_X86_ISA_LEVEL
libc_cv_have_x86_isa_level=0
#endif
EOF
eval `${CC-cc} $CFLAGS $CPPFLAGS $ISAFLAG -I$srcdir -E conftest.c | grep libc_cv_have_x86_isa_level`

4
sysdeps/x86/configure.ac
View File

@ -98,8 +98,10 @@ libc_cv_have_x86_isa_level=3
libc_cv_have_x86_isa_level=2
#elif defined __x86_64__
libc_cv_have_x86_isa_level=baseline
#elif MINIMUM_X86_ISA_LEVEL == 1
libc_cv_have_x86_isa_level=1
#else
libc_cv_have_x86_isa_level=MINIMUM_X86_ISA_LEVEL
libc_cv_have_x86_isa_level=0
#endif
EOF
eval `${CC-cc} $CFLAGS $CPPFLAGS $ISAFLAG -I$srcdir -E conftest.c | grep libc_cv_have_x86_isa_level`

12
sysdeps/x86/isa-level.h
View File

@ -35,7 +35,17 @@
# define __X86_ISA_V1 0
#endif
#if __X86_ISA_V1 && defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 \
#ifdef __x86_64__
# ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
# define __GCC_HAVE_SYNC_COMPARE_AND_SWAP
# endif
#else
# ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
# define __GCC_HAVE_SYNC_COMPARE_AND_SWAP
# endif
#endif
#if __X86_ISA_V1 && defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP \
&& defined HAVE_X86_LAHF_SAHF && defined __POPCNT__ && defined __SSE3__ \
&& defined __SSSE3__ && defined __SSE4_1__ && defined __SSE4_2__
/* NB: ISAs in x86-64 ISA level v2 are used. */