Improve Time.new() performance using division; fix
MODIFY
mrbgems/mruby-time/src/time.c
mrbgems/mruby-time/src/time.c
#include <mruby/class.h>
#include <mruby/data.h>
+#define NDIV(x,y) (-(-((x)+1)/(y))-1)
+
#if _MSC_VER < 1800
double round(double x) {
if (x >= 0.0) {
@@ -237,13 +239,15 @@ time_alloc(mrb_state *mrb, double sec, double usec, enum mrb_timezone timezone)
tm = (struct mrb_time *)mrb_malloc(mrb, sizeof(struct mrb_time));
tm->sec = tsec;
tm->usec = (time_t)llround((sec - tm->sec) * 1.0e6 + usec);
- while (tm->usec < 0) {
- tm->sec--;
- tm->usec += 1000000;
- }
- while (tm->usec >= 1000000) {
- tm->sec++;
- tm->usec -= 1000000;
+ if (tm->usec < 0) {
+ long sec2 = NDIV(usec,1000000); /* negative div */
+ tm->usec -= sec2 * 1000000;
+ tm->sec += sec2;
+ }
+ if (tm->usec >= 1000000) {
+ long sec2 = usec / 1000000;
+ tm->usec -= sec2 * 1000000;
+ tm->sec += sec2;
}
tm->timezone = timezone;
time_update_datetime(mrb, tm);

Improve Time.new() performance using division; fix #3561