mirror of https://gerrit.osmocom.org/libosmocore
84 lines
2.7 KiB
Plaintext
84 lines
2.7 KiB
Plaintext
# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_ext.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_EXT
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#
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# DESCRIPTION
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#
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# Find supported SIMD extensions by requesting cpuid. When an SIMD
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# extension is found, the -m"simdextensionname" is added to SIMD_FLAGS if
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# compiler supports it. For example, if "sse2" is available, then "-msse2"
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# is added to SIMD_FLAGS.
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#
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# This macro calls:
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#
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# AC_SUBST(SIMD_FLAGS)
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#
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# And defines:
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#
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# HAVE_AVX3 / HAVE_SSSE3 / HAVE_SSE4.1
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#
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# LICENSE
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#
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# Copyright (c) 2007 Christophe Tournayre <turn3r@users.sourceforge.net>
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# Copyright (c) 2013 Michael Petch <mpetch@capp-sysware.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#
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# NOTE: The functionality that requests the cpuid has been stripped because
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# this project detects the CPU capabilities during runtime. However, we
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# still need to check if the compiler supports the requested SIMD flag.
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#serial 12
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AC_DEFUN([AX_CHECK_SIMD],
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[
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AC_REQUIRE([AC_CANONICAL_HOST])
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AM_CONDITIONAL(HAVE_AVX2, false)
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AM_CONDITIONAL(HAVE_SSSE3, false)
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AM_CONDITIONAL(HAVE_SSE4_1, false)
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case $host_cpu in
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i[[3456]]86*|x86_64*|amd64*)
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AX_CHECK_COMPILE_FLAG(-mavx2, ax_cv_support_avx2_ext=yes, [])
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if test x"$ax_cv_support_avx2_ext" = x"yes"; then
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SIMD_FLAGS="$SIMD_FLAGS -mavx2"
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AC_DEFINE(HAVE_AVX2,,
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[Support AVX2 (Advanced Vector Extensions 2) instructions])
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AM_CONDITIONAL(HAVE_AVX2, true)
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else
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AC_MSG_WARN([Your compiler does not support AVX2 instructions])
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fi
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AX_CHECK_COMPILE_FLAG(-mssse3, ax_cv_support_ssse3_ext=yes, [])
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if test x"$ax_cv_support_ssse3_ext" = x"yes"; then
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SIMD_FLAGS="$SIMD_FLAGS -mssse3"
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AC_DEFINE(HAVE_SSSE3,,
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[Support SSSE3 (Supplemental Streaming SIMD Extensions 3) instructions])
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AM_CONDITIONAL(HAVE_SSSE3, true)
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else
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AC_MSG_WARN([Your compiler does not support SSSE3 instructions])
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fi
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AX_CHECK_COMPILE_FLAG(-msse4.1, ax_cv_support_sse41_ext=yes, [])
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if test x"$ax_cv_support_sse41_ext" = x"yes"; then
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SIMD_FLAGS="$SIMD_FLAGS -msse4.1"
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AC_DEFINE(HAVE_SSE4_1,,
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[Support SSE4.1 (Streaming SIMD Extensions 4.1) instructions])
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AM_CONDITIONAL(HAVE_SSE4_1, true)
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else
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AC_MSG_WARN([Your compiler does not support SSE4.1 instructions])
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fi
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;;
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esac
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AC_SUBST(SIMD_FLAGS)
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])
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