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Use __builtin_popcount() when available (bug #17592)

This commit is contained in:
Behdad Esfahbod 2008-12-28 04:26:26 -05:00
parent 4c209d5f0c
commit 350dc5f350
1 changed files with 4 additions and 0 deletions
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4
src/fccharset.c
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@ -546,10 +546,14 @@ FcCharSetHasChar (const FcCharSet *fcs, FcChar32 ucs4)
static FcChar32 static FcChar32
FcCharSetPopCount (FcChar32 c1) FcCharSetPopCount (FcChar32 c1)
{ {
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
return __builtin_popcount (c1);
#else
/* hackmem 169 */ /* hackmem 169 */
FcChar32 c2 = (c1 >> 1) & 033333333333; FcChar32 c2 = (c1 >> 1) & 033333333333;
c2 = c1 - c2 - ((c2 >> 1) & 033333333333); c2 = c1 - c2 - ((c2 >> 1) & 033333333333);
return (((c2 + (c2 >> 3)) & 030707070707) % 077); return (((c2 + (c2 >> 3)) & 030707070707) % 077);
#endif
} }
FcChar32 FcChar32