diff options
| author | Philipp Maier <pmaier@sysmocom.de> | 2017-03-20 12:08:42 +0100 |
|---|---|---|
| committer | Tom Tsou <tom@tsou.cc> | 2017-05-19 17:21:45 +0000 |
| commit | e8ae9fcf387540f1b210f5ece372d0fd070b6249 (patch) | |
| tree | a2cea15903fda9795776f35d1cee575b558d0ebc /config/ax_sse.m4 | |
| parent | f5bf33b287d5c4ce13c0ecac91c8d7f128a24eb5 (diff) | |
buildenv: Split up SSE3 and SSE4.1 code
Currently we find SSE3 and SSE4.1 code mixed togehter along with
generic code in one file. This introduces the risk that the
compiler exidantly mixes SSE4.1 instructions into an SSE3, or
even worse into a generic code path.
This commit splits the SSE3 and SSE4.1 code into separate files
and compiles them with the matching target options.
Change-Id: I846e190e92f1258cd412d1b2d79b539e204e04b3
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) +]) |