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Running
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Zero
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#define GLM_ENABLE_EXPERIMENTAL
#define GLM_FORCE_INLINE
#include <glm/gtc/epsilon.hpp>
#include <glm/gtc/integer.hpp>
#include <glm/gtc/type_precision.hpp>
#include <glm/gtc/vec1.hpp>
#include <glm/gtx/type_aligned.hpp>
#include <glm/vector_relational.hpp>
#include <glm/vec2.hpp>
#include <glm/vec3.hpp>
#include <glm/vec4.hpp>
#include <ctime>
#include <cstdio>
#include <vector>
#include <cmath>
namespace log2_
{
int test()
{
int Error = 0;
int A0 = static_cast<int>(glm::log2(16.f));
glm::ivec1 B0(glm::log2(glm::vec1(16.f)));
glm::ivec2 C0(glm::log2(glm::vec2(16.f)));
glm::ivec3 D0(glm::log2(glm::vec3(16.f)));
glm::ivec4 E0(glm::log2(glm::vec4(16.f)));
int A1 = glm::log2(int(16));
glm::ivec1 B1 = glm::log2(glm::ivec1(16));
glm::ivec2 C1 = glm::log2(glm::ivec2(16));
glm::ivec3 D1 = glm::log2(glm::ivec3(16));
glm::ivec4 E1 = glm::log2(glm::ivec4(16));
Error += A0 == A1 ? 0 : 1;
Error += glm::all(glm::equal(B0, B1)) ? 0 : 1;
Error += glm::all(glm::equal(C0, C1)) ? 0 : 1;
Error += glm::all(glm::equal(D0, D1)) ? 0 : 1;
Error += glm::all(glm::equal(E0, E1)) ? 0 : 1;
glm::uint64 A2 = glm::log2(glm::uint64(16));
glm::u64vec1 B2 = glm::log2(glm::u64vec1(16));
glm::u64vec2 C2 = glm::log2(glm::u64vec2(16));
glm::u64vec3 D2 = glm::log2(glm::u64vec3(16));
glm::u64vec4 E2 = glm::log2(glm::u64vec4(16));
Error += A2 == glm::uint64(4) ? 0 : 1;
Error += glm::all(glm::equal(B2, glm::u64vec1(4))) ? 0 : 1;
Error += glm::all(glm::equal(C2, glm::u64vec2(4))) ? 0 : 1;
Error += glm::all(glm::equal(D2, glm::u64vec3(4))) ? 0 : 1;
Error += glm::all(glm::equal(E2, glm::u64vec4(4))) ? 0 : 1;
return Error;
}
int perf(std::size_t Count)
{
int Error = 0;
{
std::vector<int> Result;
Result.resize(Count);
std::clock_t Begin = clock();
for(int i = 0; i < static_cast<int>(Count); ++i)
Result[i] = glm::log2(static_cast<int>(i));
std::clock_t End = clock();
std::printf("glm::log2<int>: %d clocks\n", static_cast<int>(End - Begin));
}
{
std::vector<glm::ivec4> Result;
Result.resize(Count);
std::clock_t Begin = clock();
for(int i = 0; i < static_cast<int>(Count); ++i)
Result[i] = glm::log2(glm::ivec4(i));
std::clock_t End = clock();
std::printf("glm::log2<ivec4>: %d clocks\n", static_cast<int>(End - Begin));
}
# if GLM_HAS_BITSCAN_WINDOWS
{
std::vector<glm::ivec4> Result;
Result.resize(Count);
std::clock_t Begin = clock();
for(std::size_t i = 0; i < Count; ++i)
{
glm::vec<4, unsigned long, glm::defaultp> Tmp;
_BitScanReverse(&Tmp.x, i);
_BitScanReverse(&Tmp.y, i);
_BitScanReverse(&Tmp.z, i);
_BitScanReverse(&Tmp.w, i);
Result[i] = glm::ivec4(Tmp);
}
std::clock_t End = clock();
std::printf("glm::log2<ivec4> inlined: %d clocks\n", static_cast<int>(End - Begin));
}
{
std::vector<glm::vec<4, unsigned long, glm::defaultp> > Result;
Result.resize(Count);
std::clock_t Begin = clock();
for(std::size_t i = 0; i < Count; ++i)
{
_BitScanReverse(&Result[i].x, i);
_BitScanReverse(&Result[i].y, i);
_BitScanReverse(&Result[i].z, i);
_BitScanReverse(&Result[i].w, i);
}
std::clock_t End = clock();
std::printf("glm::log2<ivec4> inlined no cast: %d clocks\n", static_cast<int>(End - Begin));
}
{
std::vector<glm::ivec4> Result;
Result.resize(Count);
std::clock_t Begin = clock();
for(std::size_t i = 0; i < Count; ++i)
{
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result[i].x), i);
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result[i].y), i);
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result[i].z), i);
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result[i].w), i);
}
std::clock_t End = clock();
std::printf("glm::log2<ivec4> reinterpret: %d clocks\n", static_cast<int>(End - Begin));
}
# endif//GLM_HAS_BITSCAN_WINDOWS
{
std::vector<float> Result;
Result.resize(Count);
std::clock_t Begin = clock();
for(std::size_t i = 0; i < Count; ++i)
Result[i] = glm::log2(static_cast<float>(i));
std::clock_t End = clock();
std::printf("glm::log2<float>: %d clocks\n", static_cast<int>(End - Begin));
}
{
std::vector<glm::vec4> Result;
Result.resize(Count);
std::clock_t Begin = clock();
for(int i = 0; i < static_cast<int>(Count); ++i)
Result[i] = glm::log2(glm::vec4(static_cast<float>(i)));
std::clock_t End = clock();
std::printf("glm::log2<vec4>: %d clocks\n", static_cast<int>(End - Begin));
}
return Error;
}
}//namespace log2_
namespace iround
{
int test()
{
int Error = 0;
for(float f = 0.0f; f < 3.1f; f += 0.05f)
{
int RoundFast = static_cast<int>(glm::iround(f));
int RoundSTD = static_cast<int>(glm::round(f));
Error += RoundFast == RoundSTD ? 0 : 1;
assert(!Error);
}
return Error;
}
}//namespace iround
namespace uround
{
int test()
{
int Error = 0;
for(float f = 0.0f; f < 3.1f; f += 0.05f)
{
int RoundFast = static_cast<int>(glm::uround(f));
int RoundSTD = static_cast<int>(glm::round(f));
Error += RoundFast == RoundSTD ? 0 : 1;
assert(!Error);
}
return Error;
}
}//namespace uround
int main()
{
int Error(0);
Error += ::log2_::test();
Error += ::iround::test();
Error += ::uround::test();
# ifdef NDEBUG
std::size_t const Samples(1000);
Error += ::log2_::perf(Samples);
# endif//NDEBUG
return Error;
}
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