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Simplified testingTimerNsec() on Windows. _div128() would make this super simple, but that's only available on VS2019, and it seems no one has implemented this in software elsewhere (the most I can find are unsigned ones...).

This commit is contained in:
Pietro Gagliardi 2019-04-28 23:20:01 -04:00
parent 3257710fb7
commit f948c30a3b
1 changed files with 8 additions and 13 deletions
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21
test/testing_windows.c
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@ -50,24 +50,19 @@ void testingTimerEnd(testingTimer *t)
int64_t testingTimerNsec(testingTimer *t)
{
LARGE_INTEGER qpf;
int64_t qpnsQuot, qpnsRem;
int64_t c;
int64_t sec;
int64_t subsec;
double subsecf;
int64_t ret;
QueryPerformanceFrequency(&qpf);
qpnsQuot = testingNsecPerSec / qpf.QuadPart;
qpnsRem = testingNsecPerSec % qpf.QuadPart;
c = t->end.QuadPart - t->start.QuadPart;
sec = c / qpf.QuadPart;
sec *= testingNsecPerSec;
subsec = c % qpf.QuadPart;
subsecf = (double) subsec;
subsecf /= qpf.QuadPart;
subsecf *= testingNsecPerSec;
subsec = (int64_t) subsecf;
return sec + subsec;
ret = c * qpnsQuot;
// TODO figure out if the following multiplication can overflow
ret += (c * qpnsRem) / qpf.QuadPart;
return ret;
}
// note: the idea for the SetThreadContext() nuttery is from https://www.codeproject.com/Articles/71529/Exception-Injection-Throwing-an-Exception-in-Other