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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2013-06-21 19:30:05 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2013-06-21 19:30:05 +0000 |
| commit | 93702a3b0754052d926c75082abf7ca156b80c45 (patch) | |
| tree | 10b032704125296644321d26cc84d3053da88dc7 /lib/Transforms/ObjCARC | |
| parent | 65af4b5333f539b9e572ebb9c4d4e97a897e5130 (diff) | |
| download | llvm-93702a3b0754052d926c75082abf7ca156b80c45.tar.gz llvm-93702a3b0754052d926c75082abf7ca156b80c45.tar.bz2 llvm-93702a3b0754052d926c75082abf7ca156b80c45.tar.xz | |
BlockFrequency: Saturate at 1 instead of 0 when multiplying a frequency with a branch probability.
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
Diffstat (limited to 'lib/Transforms/ObjCARC')
0 files changed, 0 insertions, 0 deletions