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[cairo-perf] Use full 64 bit of the clock cycle counters to avoid overflows

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This commit is contained in:
Mathias Hasselmann 2007-03-23 23:36:15 +01:00
parent 820341b4c5
commit abac4d251d
1 changed files with 14 additions and 8 deletions
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22
perf/cairo-perf-posix.c
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@ -65,11 +65,11 @@
/* timers */
#if defined(__i386__) || defined(__amd64__)
static inline unsigned long
static inline cairo_perf_ticks_t
oil_profile_stamp_rdtsc (void)
{
unsigned long ts;
__asm__ __volatile__("rdtsc\n" : "=a" (ts) : : "edx");
uint64_t ts;
__asm__ __volatile__("rdtsc\n" : "=A" (ts));
return ts;
}
#define OIL_STAMP oil_profile_stamp_rdtsc
@ -79,8 +79,17 @@ oil_profile_stamp_rdtsc (void)
static inline cairo_perf_ticks_t
oil_profile_stamp_tb(void)
{
unsigned long ts;
__asm__ __volatile__("mftb %0\n" : "=r" (ts));
uint32_t junk;
uint64_t ts;
__asm__ __volatile__ (
"1: mftbu %1;"
" mftb %0+1;"
" mftbu %0;"
" cmpw %0,%1;"
" bne 1b" :
"=r" (ts), "=r" (junk));
return ts;
}
#define OIL_STAMP oil_profile_stamp_tb
@ -158,9 +167,6 @@ cairo_perf_timer_elapsed (void) {
cairo_perf_ticks_t ticks;
#ifdef OIL_STAMP
/* Handle 32-bit wraparound of timer value */
if (timer.stop < timer.start)
timer.stop += 0x100000000ll;
ticks = (timer.stop - timer.start);
#else
ticks = (timer.tv_stop.tv_sec - timer.tv_start.tv_sec) * 1000000;