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check for __builtin_expect (used by libmpeg2)

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14015 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
henry 2004-11-22 10:28:36 +00:00
parent 03301bcf6f
commit 8cacb9c735
1 changed files with 22 additions and 0 deletions
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22
configure vendored
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@ -2309,6 +2309,25 @@ else
fi
echocheck "__builtin_expect"
# GCC branch prediction hint
cat > $TMPC << EOF
int foo (int a) {
a = __builtin_expect (a, 10);
return a == 10 ? 0 : 1;
}
int main() { return foo(10) && foo(0); }
EOF
_builtin_expect=no
cc_check && _builtin_expect=yes
if test "$_builtin_expect" = yes ; then
_def_builtin_expect='#define HAVE_BUILTIN_EXPECT 1'
else
_def_builtin_expect='#undef HAVE_BUILTIN_EXPECT'
fi
echores "$_builtin_expect"
echocheck "kstat"
cat > $TMPC << EOF
#include <kstat.h>
@ -6672,6 +6691,9 @@ $_def_dynamic_plugins
/* "restrict" keyword */
$_def_restrict_keyword
/* __builtin_expect branch prediction hint */
$_def_builtin_expect
/* attribute(used) as needed by some compilers */
#if (__GNUC__ * 100 + __GNUC_MINOR__ >= 300)
# define attribute_used __attribute__((used))