Commit 599fbde7 authored by Pierre's avatar Pierre

mtime: Minimize imprecision and prevent overflow on darwin.

Pointed-out-by: Rémi Denis-Courmont.
parent 098df76f
......@@ -216,11 +216,16 @@ mtime_t mdate( void )
uint64_t date = mach_absolute_time();
mach_timebase_info_data_t tb = mtime_timebase_info;
/* Get the ssystem dependent factor. Switch to double to prevent overflow */
double factor = (double) tb.numer / (double) tb.denom;
/* Convert to microseconds */
double d = (double) date * factor / 1000;
res = d;
/* tb.denom is uint32_t, switch to 64 bits to prevent overflow. */
uint64_t denom = tb.denom;
/* Switch to microsecs */
denom *= 1000LL;
/* Split the division to prevent overflow */
lldiv_t d = lldiv (tb.numer, denom);
res = (d.quot * date) + ((d.rem * date) / denom);
#elif defined( WIN32 ) || defined( UNDER_CE )
/* We don't need the real date, just the value of a high precision timer */
......
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