diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index daf4062b..263c63ed 100644 --- a/configure.ac +++ b/configure.ac @@ -437,6 +437,50 @@ fi AM_CONDITIONAL(USE_SSE2, test $have_sse2_intrinsics = yes) dnl =========================================================================== +dnl Check for SSSE3 + +if test "x$SSSE3_CFLAGS" = "x" ; then + SSSE3_CFLAGS="-mssse3 -Winline" +fi + +have_ssse3_intrinsics=no +AC_MSG_CHECKING(whether to use SSSE3 intrinsics) +xserver_save_CFLAGS=$CFLAGS +CFLAGS="$SSSE3_CFLAGS $CFLAGS" + +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +#include <mmintrin.h> +#include <xmmintrin.h> +#include <emmintrin.h> +#include <tmmintrin.h> +int main () { + __m128i a = _mm_set1_epi32 (0), b = _mm_set1_epi32 (0), c; + c = _mm_maddubs_epi16 (a, b); + return 0; +}]])], have_ssse3_intrinsics=yes) +CFLAGS=$xserver_save_CFLAGS + +AC_ARG_ENABLE(ssse3, + [AC_HELP_STRING([--disable-ssse3], + [disable SSSE3 fast paths])], + [enable_ssse3=$enableval], [enable_ssse3=auto]) + +if test $enable_ssse3 = no ; then + have_ssse3_intrinsics=disabled +fi + +if test $have_ssse3_intrinsics = yes ; then + AC_DEFINE(USE_SSSE3, 1, [use SSSE3 compiler intrinsics]) +fi + +AC_MSG_RESULT($have_ssse3_intrinsics) +if test $enable_ssse3 = yes && test $have_ssse3_intrinsics = no ; then + AC_MSG_ERROR([SSSE3 intrinsics not detected]) +fi + +AM_CONDITIONAL(USE_SSSE3, test $have_ssse3_intrinsics = yes) + +dnl =========================================================================== dnl Other special flags needed when building code using MMX or SSE instructions case $host_os in solaris*) @@ -471,6 +515,7 @@ AC_SUBST(MMX_CFLAGS) AC_SUBST(MMX_LDFLAGS) AC_SUBST(SSE2_CFLAGS) AC_SUBST(SSE2_LDFLAGS) +AC_SUBST(SSSE3_CFLAGS) dnl =========================================================================== dnl Check for VMX/Altivec |