From 3d8b15ea709ec7fc84e6de191d4eb9858b0b4edf Mon Sep 17 00:00:00 2001 From: Jakub Staszak Date: Thu, 28 Jul 2011 23:42:08 +0000 Subject: [PATCH] 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 --- lib/Analysis/BranchProbabilityInfo.cpp | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/lib/Analysis/BranchProbabilityInfo.cpp b/lib/Analysis/BranchProbabilityInfo.cpp index 527a4ecbd88..0d0d132a649 100644 --- a/lib/Analysis/BranchProbabilityInfo.cpp +++ b/lib/Analysis/BranchProbabilityInfo.cpp @@ -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