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Check more likely condition first [Feature #16335]

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Nobuyoshi Nakada 2019-11-13 16:53:12 +09:00
parent 3324bc9d17
commit e7ea6e078f
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1 changed files with 10 additions and 1 deletions
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11
time.c
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@ -3067,7 +3067,16 @@ time_arg(int argc, const VALUE *argv, struct vtm *vtm)
static int
leap_year_p(long y)
{
return ((y % 4 == 0) && (y % 100 != 0)) || (y % 400 == 0);
/* TODO:
* ensure about negative years in proleptic Gregorian calendar.
*/
unsigned long uy = (unsigned long)(LIKELY(y >= 0) ? y : -y);
if (LIKELY(uy % 4 != 0)) return 0;
unsigned long century = uy / 100;
if (LIKELY(uy != century * 100)) return 1;
return century % 4 == 0;
}
static time_t