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Fixed log2 in GCC

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This commit is contained in:
Christophe Riccio
2012-01-08 22:36:49 +00:00
parent 8711720b91
commit 1ed0e3865b
3 changed files with 18 additions and 10 deletions
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18
test/gtx/gtx_integer.cpp
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@@ -32,15 +32,20 @@ int test_log2()
{
int Error = 0;
for(std::size_t i = 1; i < 1000000; ++i)
for(std::size_t i = 1; i < 24; ++i)
{
glm::uint A = glm::log2(glm::uint(i));
double B = glm::log2(double(i));
glm::uint A = glm::log2(glm::uint(1 << i));
glm::uint B = glm::uint(glm::log2(double(1 << i)));
Error += glm::equalEpsilon(double(A), B, 1.0) ? 0 : 1;
//assert(!Error);
//Error += glm::equalEpsilon(double(A), B, 1.0) ? 0 : 1;
Error += glm::abs(double(A) - B) <= 24 ? 0 : 1;
assert(!Error);
printf("Log2(%d) Error: %d, %d\n", 1 << i, A, B);
}
printf("log2 error: %d\n", Error);
return Error;
}
@@ -49,7 +54,8 @@ int test_nlz()
int Error = 0;
for(std::size_t i = 1; i < 33; ++i)
printf("%d, %d\n", glm::nlz(i), 31u - glm::findMSB(i));
Error += glm::nlz(i) == 31u - glm::findMSB(i) ? 0 : 1;
//printf("%d, %d\n", glm::nlz(i), 31u - glm::findMSB(i));
return Error;
}