diff options
| -rw-r--r-- | configure.ac | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index f8a70bef0e2..b1c1d7df4d8 100644 --- a/configure.ac +++ b/configure.ac @@ -396,6 +396,61 @@ fi AM_CONDITIONAL([SSE41_SUPPORTED], [test x$SSE41_SUPPORTED = x1]) AC_SUBST([SSE41_CFLAGS], $SSE41_CFLAGS) +dnl Check for Endianness +AC_C_BIGENDIAN( + little_endian=no, + little_endian=yes, + little_endian=no, + little_endian=no +) + +dnl Check for POWER8 Architecture +PWR8_CFLAGS="-mpower8-vector" +have_pwr8_intrinsics=no +AC_MSG_CHECKING(whether gcc supports -mpower8-vector) +save_CFLAGS=$CFLAGS +CFLAGS="$PWR8_CFLAGS $CFLAGS" +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +#if defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)) +#error "Need GCC >= 4.8 for sane POWER8 support" +#endif +#include <altivec.h> +int main () { + vector unsigned char r; + vector unsigned int v = vec_splat_u32 (1); + r = __builtin_vec_vgbbd ((vector unsigned char) v); + return 0; +}]])], have_pwr8_intrinsics=yes) +CFLAGS=$save_CFLAGS + +AC_ARG_ENABLE(pwr8, + [AC_HELP_STRING([--disable-pwr8-inst], + [disable POWER8-specific instructions])], + [enable_pwr8=$enableval], [enable_pwr8=auto]) + +if test "x$enable_pwr8" = xno ; then + have_pwr8_intrinsics=disabled +fi + +if test $have_pwr8_intrinsics = yes && test $little_endian = yes ; then + DEFINES="$DEFINES -D_ARCH_PWR8" + CXXFLAGS="$CXXFLAGS $PWR8_CFLAGS" + CFLAGS="$CFLAGS $PWR8_CFLAGS" +else + PWR8_CFLAGS= +fi + +AC_MSG_RESULT($have_pwr8_intrinsics) +if test "x$enable_pwr8" = xyes && test $have_pwr8_intrinsics = no ; then + AC_MSG_ERROR([POWER8 compiler support not detected]) +fi + +if test $have_pwr8_intrinsics = yes && test $little_endian = no ; then + AC_MSG_WARN([POWER8 optimization is enabled only on POWER8 Little-Endian]) +fi + +AC_SUBST([PWR8_CFLAGS], $PWR8_CFLAGS) + dnl Can't have static and shared libraries, default to static if user dnl explicitly requested. If both disabled, set to static since shared dnl was explicitly requested. |