Benjamin Kramer
b47aceaf06
Revert "BlockFrequency: Saturate at 1 instead of 0 when multiplying a frequency with a branch probability."
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This reverts commit r184584. Breaks PPC selfhost.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184590 91177308-0d34-0410-b5e6-96231b3b80d8
2013-06-21 20:20:27 +00:00
Benjamin Kramer
93702a3b07
BlockFrequency: Saturate at 1 instead of 0 when multiplying a frequency with a branch probability.
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Zero is used by BlockFrequencyInfo as a special "don't know" value. It also
causes a sink for frequencies as you can't ever get off a zero frequency with
more multiplies.
This recovers a 10% regression on MultiSource/Benchmarks/7zip. A zero frequency
was propagated into an inner loop causing excessive spilling.
PR16402.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184584 91177308-0d34-0410-b5e6-96231b3b80d8
2013-06-21 19:30:05 +00:00
Benjamin Kramer
bc1430a0a0
BlockFrequency: Use a smarter overflow check.
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This trades one 64 bit div for one 64 bit mul and some arithmetic.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143106 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-27 16:38:50 +00:00
Jakub Staszak
ffcc2a542c
Optimize 96-bit division a little bit.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136222 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-27 16:00:40 +00:00
Jakub Staszak
636a02b57c
Move static methods to the anonymous namespace.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136221 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-27 15:51:51 +00:00
Jakub Staszak
a26ec886a3
Add BlockFrequency class.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135992 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-25 22:24:51 +00:00
