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Change LBH_TAKEN_WEIGHT to 124 (from 128). Right now, sum of 

LBH_TAKEN_WEIGHT + LBH_NONTAKEN_WEIGHT = 128 which in _most_ cases reduce
number of rounding errors.

llvm-svn: 136428
This commit is contained in:
Jakub Staszak 2011-07-28 23:42:08 +00:00
parent dd475c39d7
commit eec01ccbf9
1 changed files with 4 additions and 4 deletions
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8
llvm/lib/Analysis/BranchProbabilityInfo.cpp
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@ -52,7 +52,7 @@ class BranchProbabilityAnalysis {
// V
// BB1<-+
// | |
// | | (Weight = 128)
// | | (Weight = 124)
// V |
// BB2--+
// |
@ -60,10 +60,10 @@ class BranchProbabilityAnalysis {
// V
// BB3
//
// Probability of the edge BB2->BB1 = 128 / (128 + 4) = 0.9696..
// Probability of the edge BB2->BB3 = 4 / (128 + 4) = 0.0303..
// Probability of the edge BB2->BB1 = 124 / (124 + 4) = 0.96875
// Probability of the edge BB2->BB3 = 4 / (124 + 4) = 0.03125
static const uint32_t LBH_TAKEN_WEIGHT = 128;
static const uint32_t LBH_TAKEN_WEIGHT = 124;
static const uint32_t LBH_NONTAKEN_WEIGHT = 4;
// Standard weight value. Used when none of the heuristics set weight for