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

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



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136428 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakub Staszak
2011-07-28 23:42:08 +00:00
parent 48c693ff56
commit 3d8b15ea70
1 changed files with 4 additions and 4 deletions
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8
lib/Analysis/BranchProbabilityInfo.cpp
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@ -52,7 +52,7 @@ class BranchProbabilityAnalysis {
// V // V
// BB1<-+ // BB1<-+
// | | // | |
// | | (Weight = 128) // | | (Weight = 124)
// V | // V |
// BB2--+ // BB2--+
// | // |
@ -60,10 +60,10 @@ class BranchProbabilityAnalysis {
// V // V
// BB3 // BB3
// //
// Probability of the edge BB2->BB1 = 128 / (128 + 4) = 0.9696.. // Probability of the edge BB2->BB1 = 124 / (124 + 4) = 0.96875
// Probability of the edge BB2->BB3 = 4 / (128 + 4) = 0.0303.. // 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; static const uint32_t LBH_NONTAKEN_WEIGHT = 4;
// Standard weight value. Used when none of the heuristics set weight for // Standard weight value. Used when none of the heuristics set weight for