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Diffstat (limited to 'config/ax_sse.m4')
| -rw-r--r-- | config/ax_sse.m4 | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/config/ax_sse.m4 b/config/ax_sse.m4 new file mode 100644 index 0000000..ed4d223 --- /dev/null +++ b/config/ax_sse.m4 @@ -0,0 +1,75 @@ +# =========================================================================== +# 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_MMX / HAVE_SSE / HAVE_SSE2 / HAVE_SSE3 / HAVE_SSSE3 / HAVE_SSE4.1 / HAVE_SSE4.2 / HAVE_AVX +# +# 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_SSE], +[ + AC_REQUIRE([AC_CANONICAL_HOST]) + + case $host_cpu in + i[[3456]]86*|x86_64*|amd64*) + + AC_REQUIRE([AX_GCC_X86_CPUID]) + AC_REQUIRE([AX_GCC_X86_AVX_XGETBV]) + + AX_GCC_X86_CPUID(0x00000001) + + AX_CHECK_COMPILE_FLAG(-msse3, ax_cv_support_sse3_ext=yes, []) + if test x"$ax_cv_support_sse3_ext" = x"yes"; then + SIMD_FLAGS="$SIMD_FLAGS -msse3" + AC_DEFINE(HAVE_SSE3,,[Support SSE3 (Streaming SIMD Extensions 3) instructions]) + AM_CONDITIONAL(HAVE_SSE3, true) + else + AC_MSG_WARN([Your compiler does not support sse3 instructions, can you try another compiler?]) + AM_CONDITIONAL(HAVE_SSE3, false) + fi + + AX_CHECK_COMPILE_FLAG(-msse4.1, ax_cv_support_sse41_ext=yes, []) + if test x"$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, can you try another compiler?]) + AM_CONDITIONAL(HAVE_SSE4_1, false) + fi + ;; + esac + + AC_SUBST(SIMD_FLAGS) +]) |