mirror of https://gitlab.freedesktop.org/mesa/mesa
configure.ac: roll up a program for the sse4.1 check
So when checking/building sse code we have three possibilities: 1 Old compiler, throws an error when using -msse* 2 New compiler, user disables sse* (-mno-sse*) 3 New compiler, user doesn't disable sse The original code, added code for #1 but not #2. Later on we patched around the lack of handling #2 by wrapping the code in __SSE4_1__. Yet it lead to a missing/undefined symbol in case of #1 or #2, which might cause an issue for #2 when using the i965 driver. A bit later we "fixed" the undefined symbol by using #1, rather than updating it to handle #2. With this commit we set things straight :) To top it all up, conventions state that in case of conflicting (-enable-foo -disable-foo) options, the latter one takes precedence. Thus we need to make sure to prepend -msse4.1 to CFLAGS in our test. v2: Clean the #includes. Suggested by Ilia, Matt & Siavash. Cc: "10.3 10.4" <mesa-stable@lists.freedesktop.org> Tested-by: David Heidelberg <david@ixit.cz> Tested-by: Siavash Eliasi <siavashserver@gmail.com> Reviewed-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
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configure.ac
11
configure.ac
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@ -252,7 +252,16 @@ AC_SUBST([VISIBILITY_CXXFLAGS])
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dnl
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dnl Optional flags, check for compiler support
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dnl
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AX_CHECK_COMPILE_FLAG([-msse4.1], [SSE41_SUPPORTED=1], [SSE41_SUPPORTED=0])
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save_CFLAGS="$CFLAGS"
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CFLAGS="-msse4.1 $CFLAGS"
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#include <smmintrin.h>
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int main () {
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__m128i a = _mm_set1_epi32 (0), b = _mm_set1_epi32 (0), c;
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c = _mm_max_epu32(a, b);
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return 0;
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}]])], SSE41_SUPPORTED=1)
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CFLAGS="$save_CFLAGS"
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if test "x$SSE41_SUPPORTED" = x1; then
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DEFINES="$DEFINES -DUSE_SSE41"
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fi
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