diff options
Diffstat (limited to 'm4/ax_check_simd.m4')
| -rw-r--r-- | m4/ax_check_simd.m4 | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/m4/ax_check_simd.m4 b/m4/ax_check_simd.m4 new file mode 100644 index 00000000..d07d706f --- /dev/null +++ b/m4/ax_check_simd.m4 @@ -0,0 +1,82 @@ +# =========================================================================== +# http://www.gnu.org/software/autoconf-archive/ax_ext.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_EXT +# +# DESCRIPTION +# +# Find supported SIMD extensions by requesting cpuid. When an SIMD +# extension is found, the -m"simdextensionname" is added to SIMD_FLAGS if +# compiler supports it. For example, if "sse2" is available, then "-msse2" +# is added to SIMD_FLAGS. +# +# This macro calls: +# +# AC_SUBST(SIMD_FLAGS) +# +# And defines: +# +# HAVE_AVX3 / HAVE_SSE3 / HAVE_SSE4.1 +# +# LICENSE +# +# Copyright (c) 2007 Christophe Tournayre <turn3r@users.sourceforge.net> +# Copyright (c) 2013 Michael Petch <mpetch@capp-sysware.com> +# +# Copying and distribution of this file, with or without modification, are +# permitted in any medium without royalty provided the copyright notice +# and this notice are preserved. This file is offered as-is, without any +# warranty. +# +# NOTE: The functionality that requests the cpuid has been stripped because +# this project detects the CPU capabilities during runtime. However, we +# still need to check if the compiler supports the requested SIMD flag. + +#serial 12 + +AC_DEFUN([AX_CHECK_SIMD], +[ + AC_REQUIRE([AC_CANONICAL_HOST]) + + case $host_cpu in + i[[3456]]86*|x86_64*|amd64*) + AX_CHECK_COMPILE_FLAG(-mavx2, ax_cv_support_avx2_ext=yes, []) + if test x"$ax_cv_support_avx2_ext" = x"yes"; then + SIMD_FLAGS="$SIMD_FLAGS -mavx2" + AC_DEFINE(HAVE_AVX2,, + [Support AVX2 (Advanced Vector Extensions 2) instructions]) + AM_CONDITIONAL(HAVE_AVX2, true) + else + AC_MSG_WARN([Your compiler does not support AVX2 instructions]) + AM_CONDITIONAL(HAVE_AVX2, false) + fi + + AX_CHECK_COMPILE_FLAG(-msse3, ax_cv_support_sse3_ext=yes, []) + if test x"$ax_cv_support_sse3_ext" = x"yes"; then + SIMD_FLAGS="$SIMD_FLAGS -msse3" + AC_DEFINE(HAVE_SSE3,, + [Support SSE3 (Streaming SIMD Extensions 3) instructions]) + AM_CONDITIONAL(HAVE_SSE3, true) + else + AC_MSG_WARN([Your compiler does not support SSE3 instructions]) + AM_CONDITIONAL(HAVE_SSE3, false) + fi + + AX_CHECK_COMPILE_FLAG(-msse4.1, ax_cv_support_sse41_ext=yes, []) + if test x"$ax_cv_support_sse41_ext" = x"yes"; then + SIMD_FLAGS="$SIMD_FLAGS -msse4.1" + AC_DEFINE(HAVE_SSE4_1,, + [Support SSE4.1 (Streaming SIMD Extensions 4.1) instructions]) + AM_CONDITIONAL(HAVE_SSE4_1, true) + else + AC_MSG_WARN([Your compiler does not support SSE4.1 instructions]) + AM_CONDITIONAL(HAVE_SSE4_1, false) + fi + ;; + esac + + AC_SUBST(SIMD_FLAGS) +]) |