AuroraMiddleware/skia2
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nanobench on Windows: try compiler barriers around timer instead.

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BUG=skia:

Review URL: https://codereview.chromium.org/391193003
This commit is contained in:
Mike Klein 2014-07-15 19:04:14 -04:00
parent f7e51ea79e
commit 7edaeb515c
2 changed files with 16 additions and 11 deletions
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3
gyp/bench.gyp
View File

@ -48,9 +48,6 @@
'tools.gyp:crash_handler',
'tools.gyp:timer',
],
# Experiment to see if LTCG is the key difference leading to Windows infinite loops.
'msvs_settings': { 'VCLinkerTool': { 'LinkTimeCodeGeneration': '0' } },
},
],
}

24
tools/timer/SysTimer_windows.cpp
View File

@ -6,6 +6,8 @@
*/
#include "SysTimer_windows.h"
#include <intrin.h>
static ULONGLONG win_cpu_time() {
FILETIME createTime;
FILETIME exitTime;
@ -23,11 +25,6 @@ static ULONGLONG win_cpu_time() {
return start_cpu_sys.QuadPart + start_cpu_usr.QuadPart;
}
void SysTimer::startWall() {
if (0 == ::QueryPerformanceCounter(&fStartWall)) {
fStartWall.QuadPart = 0;
}
}
void SysTimer::startCpu() {
fStartCpu = win_cpu_time();
}
@ -36,11 +33,22 @@ double SysTimer::endCpu() {
ULONGLONG end_cpu = win_cpu_time();
return static_cast<double>(end_cpu - fStartCpu) / 10000.0L;
}
static void wall_timestamp(LARGE_INTEGER* now) {
_ReadWriteBarrier();
if (0 == ::QueryPerformanceCounter(now)) {
now->QuadPart = 0;
}
_ReadWriteBarrier();
}
void SysTimer::startWall() {
wall_timestamp(&fStartWall);
}
double SysTimer::endWall() {
LARGE_INTEGER end_wall;
if (0 == ::QueryPerformanceCounter(&end_wall)) {
end_wall.QuadPart = 0;
}
wall_timestamp(&end_wall);
LARGE_INTEGER ticks_elapsed;
ticks_elapsed.QuadPart = end_wall.QuadPart - fStartWall.QuadPart;