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BlockFrequency: Bump up the entry frequency a bit.

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This is a band-aid to fix the most severe regressions we're seeing from basing
spill decisions on block frequencies, until we have a better solution.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184835 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2013-06-25 13:34:40 +00:00
parent 1bc147c091
commit 75b5162154
6 changed files with 22 additions and 32 deletions
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2
include/llvm/Analysis/BlockFrequencyImpl.h
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@ -33,7 +33,7 @@ class BlockFrequencyInfo;
class MachineBlockFrequencyInfo;
/// BlockFrequencyImpl implements block frequency algorithm for IR and
/// Machine Instructions. Algorithm starts with value 1024 (START_FREQ)
/// Machine Instructions. Algorithm starts with value ENTRY_FREQ
/// for the entry block and then propagates frequencies using branch weights
/// from (Machine)BranchProbabilityInfo. LoopInfo is not required because
/// algorithm can find "backedges" by itself.