commit ff2873742e5bd4c59a7769fbbe9d6397e0c298f7
author Xinliang David Li <davidxl@google.com> Fri Jun 03 23:48:36 2016 +0000
committer Xinliang David Li <davidxl@google.com> Fri Jun 03 23:48:36 2016 +0000
tree c4a732d112dff33429f277a5a60955c105b56d9d
parent 7bae9adb0850519505d9f134d1ed9b39bc2b04c9

Replace hard coded probability threshold with parameter /NFC

llvm-svn: 271751

llvm/lib/CodeGen/MachineBlockPlacement.cpp

diff --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index 9df4da2..c562af9 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -116,6 +116,8 @@
                                       cl::desc("Cost of jump instructions."),
                                       cl::init(1), cl::Hidden);
 
+extern cl::opt<unsigned> StaticLikelyProb;
+
 namespace {
 class BlockChain;
 /// \brief Type for our function-wide basic block -> block chain mapping.
@@ -405,7 +407,7 @@
 MachineBlockPlacement::selectBestSuccessor(MachineBasicBlock *BB,
                                            BlockChain &Chain,
                                            const BlockFilterSet *BlockFilter) {
-  const BranchProbability HotProb(4, 5); // 80%
+  const BranchProbability HotProb(StaticLikelyProb, 100);
 
   MachineBasicBlock *BestSucc = nullptr;
   auto BestProb = BranchProbability::getZero();