diff options
Diffstat (limited to 'config/c-compiler.m4')
| -rw-r--r-- | config/c-compiler.m4 | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/config/c-compiler.m4 b/config/c-compiler.m4 index a129edb88e1..309d5b04b46 100644 --- a/config/c-compiler.m4 +++ b/config/c-compiler.m4 @@ -605,24 +605,26 @@ fi])# PGAC_HAVE_GCC__ATOMIC_INT64_CAS # test the 8-byte variant, _mm_crc32_u64, but it is assumed to be present if # the other ones are, on x86-64 platforms) # -# An optional compiler flag can be passed as argument (e.g. -msse4.2). If the -# intrinsics are supported, sets pgac_sse42_crc32_intrinsics, and CFLAGS_CRC. +# If the intrinsics are supported, sets pgac_sse42_crc32_intrinsics. AC_DEFUN([PGAC_SSE42_CRC32_INTRINSICS], -[define([Ac_cachevar], [AS_TR_SH([pgac_cv_sse42_crc32_intrinsics_$1])])dnl -AC_CACHE_CHECK([for _mm_crc32_u8 and _mm_crc32_u32 with CFLAGS=$1], [Ac_cachevar], -[pgac_save_CFLAGS=$CFLAGS -CFLAGS="$pgac_save_CFLAGS $1" -AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <nmmintrin.h>], - [unsigned int crc = 0; - crc = _mm_crc32_u8(crc, 0); - crc = _mm_crc32_u32(crc, 0); - /* return computed value, to prevent the above being optimized away */ - return crc == 0;])], +[define([Ac_cachevar], [AS_TR_SH([pgac_cv_sse42_crc32_intrinsics])])dnl +AC_CACHE_CHECK([for _mm_crc32_u8 and _mm_crc32_u32], [Ac_cachevar], +[AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <nmmintrin.h> + #if defined(__has_attribute) && __has_attribute (target) + __attribute__((target("sse4.2"))) + #endif + static int crc32_sse42_test(void) + { + unsigned int crc = 0; + crc = _mm_crc32_u8(crc, 0); + crc = _mm_crc32_u32(crc, 0); + /* return computed value, to prevent the above being optimized away */ + return crc == 0; + }], + [return crc32_sse42_test();])], [Ac_cachevar=yes], - [Ac_cachevar=no]) -CFLAGS="$pgac_save_CFLAGS"]) + [Ac_cachevar=no])]) if test x"$Ac_cachevar" = x"yes"; then - CFLAGS_CRC="$1" pgac_sse42_crc32_intrinsics=yes fi undefine([Ac_cachevar])dnl |