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When we're compiling/running on a kernel without sse/sse2 support, we have

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to be careful when using gcc-3.x.  gcc-3.x is able to emit sse/sse2
instructions for normal C code when we compile for maximum performance with
something like the -march=athlon-xp switch.

So, if the kernel does not support the sse/sse2 instruction set extension,
we have to tell gcc-3.x to not emit see/sse2 instructions for regular C code,
otherwise mplayer might crash with a SIGILL signal.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7336 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
jkeil 2002-09-09 19:01:34 +00:00
parent 5bf4fb0263
commit 17bafc411c
1 changed files with 15 additions and 4 deletions
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19
configure vendored
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@ -884,24 +884,35 @@ EOF
echores "failed" echores "failed"
echo "It seems that your kernel does not correctly support $2." echo "It seems that your kernel does not correctly support $2."
echo "To use $2 extensions in MPlayer, you have to upgrade/recompile your kernel!" echo "To use $2 extensions in MPlayer, you have to upgrade/recompile your kernel!"
return 1 return 1
fi fi
fi fi
return 1 return 0
} }
extcheck $_mmx "mmx" "emms" || _mmx=no extcheck $_mmx "mmx" "emms" || _mmx=no
extcheck $_mmx2 "mmx2" "sfence" || _mmx2=no extcheck $_mmx2 "mmx2" "sfence" || _mmx2=no
extcheck $_3dnow "3dnow" "femms" || _3dnow=no extcheck $_3dnow "3dnow" "femms" || _3dnow=no
extcheck $_3dnowex "3dnowex" "pswapd %%mm0, %%mm0" || _3dnowex=no extcheck $_3dnowex "3dnowex" "pswapd %%mm0, %%mm0" || _3dnowex=no
extcheck $_sse "sse" "xorps %%xmm0, %%xmm0" || _sse=no extcheck $_sse "sse" "xorps %%xmm0, %%xmm0" || _sse=no _gcc3_ext="$_gcc3_ext -mno-sse"
extcheck $_sse2 "sse2" "xorpd %%xmm0, %%xmm0" || _sse2=no extcheck $_sse2 "sse2" "xorpd %%xmm0, %%xmm0" || _sse2=no _gcc3_ext="$_gcc3_ext -mno-sse2"
echocheck "mtrr support" echocheck "mtrr support"
echores "$_mtrr" echores "$_mtrr"
if test "$_mtrr" = yes ; then if test "$_mtrr" = yes ; then
_optimizing="$_optimizing mtrr" _optimizing="$_optimizing mtrr"
fi fi
if test "$_gcc3_ext" != ""; then
# if we had to disable sse/sse2 because the active kernel does not
# support this instruction set extension, we also have to tell
# gcc3 to not generate sse/sse2 instructions for normal C code
cat > $TMPC << EOF
int main(void) { return 0; }
EOF
cc_check $_march $_gcc3_ext && _march="$_march $_gcc3_ext"
fi
fi fi