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lib/CodeGen/LiveIntervalAnalysis.cpp: [PR9590] Don't use std::pow(float,float) here.

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We don't expect the real "powf()" on some hosts (and powf() would be available on other hosts).
For consistency, std::pow(double,double) may be called instead.
Or, precision issue might attack us, to see unstable regalloc and stack coloring.

llvm-svn: 128629
This commit is contained in:
NAKAMURA Takumi 2011-03-31 12:11:33 +00:00
parent 40e705fb80
commit e0a71fb3e0
1 changed files with 3 additions and 1 deletions
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lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -1715,7 +1715,9 @@ LiveIntervals::getSpillWeight(bool isDef, bool isUse, unsigned loopDepth) {
// overflow a float. This expression behaves like 10^d for small d, but is
// more tempered for large d. At d=200 we get 6.7e33 which leaves a bit of
// headroom before overflow.
float lc = std::pow(1 + (100.0f / (loopDepth+10)), (float)loopDepth);
// By the way, powf() might be unavailable here. For consistency,
// We may take pow(double,double).
float lc = std::pow(1 + (100.0 / (loopDepth + 10)), (double)loopDepth);
return (isDef + isUse) * lc;
}