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test perf fastAtan

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This commit is contained in:
Mathias Labeyrie 2014-11-05 15:20:53 +01:00
parent a7b3fca0b2
commit ef1c33d2d5
1 changed files with 22 additions and 0 deletions
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22
test/gtx/gtx_fast_trigonometry.cpp
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@ -117,6 +117,27 @@ namespace fastAsin{
}
}
namespace fastAtan{
int perf()
{
const float begin = -glm::pi<float>();
const float end = glm::pi<float>();
float result = 0.f;
const std::clock_t timestamp1 = std::clock();
for (float i = begin; i<end; i = nextafterf(i, end))
result = glm::fastAtan(i);
const std::clock_t timestamp2 = std::clock();
for (float i = begin; i<end; i = nextafterf(i, end))
result = glm::atan(i);
const std::clock_t timestamp3 = std::clock();
const std::clock_t time_fast = timestamp2 - timestamp1;
const std::clock_t time_default = timestamp3 - timestamp2;
std::printf("fastAtan Time %d clocks\n", static_cast<unsigned int>(time_fast));
std::printf("atan Time %d clocks\n", static_cast<unsigned int>(time_default));
return time_fast < time_default ? 0 : 1;
}
}
int main()
{
@ -127,6 +148,7 @@ int main()
Error += ::fastTan::perf();
Error += ::fastAcos::perf();
Error += ::fastAsin::perf();
Error += ::fastAtan::perf();
return Error;
}