diff options
Diffstat (limited to 'contrib/llvm/lib/CodeGen/MachineBranchProbabilityInfo.cpp')
| -rw-r--r-- | contrib/llvm/lib/CodeGen/MachineBranchProbabilityInfo.cpp | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/contrib/llvm/lib/CodeGen/MachineBranchProbabilityInfo.cpp b/contrib/llvm/lib/CodeGen/MachineBranchProbabilityInfo.cpp index cf6d401..fe73406 100644 --- a/contrib/llvm/lib/CodeGen/MachineBranchProbabilityInfo.cpp +++ b/contrib/llvm/lib/CodeGen/MachineBranchProbabilityInfo.cpp @@ -24,9 +24,21 @@ INITIALIZE_PASS_BEGIN(MachineBranchProbabilityInfo, "machine-branch-prob", INITIALIZE_PASS_END(MachineBranchProbabilityInfo, "machine-branch-prob", "Machine Branch Probability Analysis", false, true) +cl::opt<unsigned> + StaticLikelyProb("static-likely-prob", + cl::desc("branch probability threshold in percentage" + "to be considered very likely"), + cl::init(80), cl::Hidden); + +cl::opt<unsigned> ProfileLikelyProb( + "profile-likely-prob", + cl::desc("branch probability threshold in percentage to be considered" + " very likely when profile is available"), + cl::init(51), cl::Hidden); + char MachineBranchProbabilityInfo::ID = 0; -void MachineBranchProbabilityInfo::anchor() { } +void MachineBranchProbabilityInfo::anchor() {} BranchProbability MachineBranchProbabilityInfo::getEdgeProbability( const MachineBasicBlock *Src, @@ -42,11 +54,9 @@ BranchProbability MachineBranchProbabilityInfo::getEdgeProbability( std::find(Src->succ_begin(), Src->succ_end(), Dst)); } -bool -MachineBranchProbabilityInfo::isEdgeHot(const MachineBasicBlock *Src, - const MachineBasicBlock *Dst) const { - // Hot probability is at least 4/5 = 80% - static BranchProbability HotProb(4, 5); +bool MachineBranchProbabilityInfo::isEdgeHot( + const MachineBasicBlock *Src, const MachineBasicBlock *Dst) const { + BranchProbability HotProb(StaticLikelyProb, 100); return getEdgeProbability(Src, Dst) > HotProb; } @@ -63,7 +73,7 @@ MachineBranchProbabilityInfo::getHotSucc(MachineBasicBlock *MBB) const { } } - static BranchProbability HotProb(4, 5); + BranchProbability HotProb(StaticLikelyProb, 100); if (getEdgeProbability(MBB, MaxSucc) >= HotProb) return MaxSucc; |
