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configure.ac: Detect if running on POWER8 arch

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To determine if we could use special POWER8 assembly directives, we first
need to detect whether we are running on POWER8 architecture. This patch
adds this detection to configure.ac and adds the necessary compilation
flags accordingly.

v2:

- Add option to disable POWER8 instructions generation
- Detect whether building on BE or LE machine and build with
  -mpower8-vector only on LE machine
- Make the printed messages more standard

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Oded Gabbay 2015-12-03 09:11:04 +02:00
parent 7295f4fcc2
commit afe88f66a8
1 changed files with 55 additions and 0 deletions
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55
configure.ac
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@ -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.