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Where possible use compiler builtins for CountBits and FindFirstBit.

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Jonathan G Rennison
2016-09-04 18:01:38 +01:00
parent 376a45d9fc
commit 349cd8a6f0
3 changed files with 48 additions and 3 deletions
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16
config.lib
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@@ -1812,6 +1812,22 @@ EOL
fi
fi
log 2 "executing $cc_host $CFLAGS $LDFLAGS $STATIC_FLAGS -o tmp.config.bitmath-builtins -x c++ -"
"$cc_host" $CFLAGS $LDFLAGS $STATIC_FLAGS -o tmp.config.bitmath-builtins -x c++ - 2> /dev/null << EOL
int main() {
return __builtin_popcountll(__builtin_popcountl(__builtin_popcount(__builtin_ctz(1))));
}
EOL
ret=$?
rm -f tmp.config.bitmath-builtins
log 2 " exit code $ret"
if [ $ret -ne 0 ]; then
log 1 "checking bitmath builtins... no"
else
log 1 "checking bitmath builtins... found"
CFLAGS="$CFLAGS -DWITH_BITMATH_BUILTINS"
fi
if [ "$os" != "CYGWIN" ] && [ "$os" != "HAIKU" ] && [ "$os" != "MORPHOS" ] && [ "$os" != "OSX" ] && [ "$os" != "DOS" ] && [ "$os" != "WINCE" ] && [ "$os" != "PSP" ] && [ "$os" != "OS2" ]; then
log 2 "executing $cc_host $CFLAGS $LDFLAGS $STATIC_FLAGS -o tmp.config.demangle -x c++ - -lstdc++"
"$cc_host" $CFLAGS $LDFLAGS $STATIC_FLAGS -o tmp.config.demangle -x c++ - -lstdc++ 2> /dev/null << EOL