diff options
| -rw-r--r-- | configure.ac | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 91e111b8eae..8aa070d2125 100644 --- a/configure.ac +++ b/configure.ac @@ -252,7 +252,16 @@ AC_SUBST([VISIBILITY_CXXFLAGS]) dnl dnl Optional flags, check for compiler support dnl -AX_CHECK_COMPILE_FLAG([-msse4.1], [SSE41_SUPPORTED=1], [SSE41_SUPPORTED=0]) +save_CFLAGS="$CFLAGS" +CFLAGS="-msse4.1 $CFLAGS" +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +#include <smmintrin.h> +int main () { + __m128i a = _mm_set1_epi32 (0), b = _mm_set1_epi32 (0), c; + c = _mm_max_epu32(a, b); + return 0; +}]])], SSE41_SUPPORTED=1) +CFLAGS="$save_CFLAGS" if test "x$SSE41_SUPPORTED" = x1; then DEFINES="$DEFINES -DUSE_SSE41" fi |