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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136428 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/BranchProbabilityInfo.cpp b/lib/Analysis/BranchProbabilityInfo.cpp
index 527a4ec..0d0d132 100644
--- a/lib/Analysis/BranchProbabilityInfo.cpp
+++ b/lib/Analysis/BranchProbabilityInfo.cpp
@@ -52,7 +52,7 @@
// V
// BB1<-+
// | |
- // | | (Weight = 128)
+ // | | (Weight = 124)
// V |
// BB2--+
// |
@@ -60,10 +60,10 @@
// 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