diff options
| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-08-08 00:20:37 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-08-08 00:20:37 +0000 |
| commit | 5e63d43e48f6d0b597d21b83a1eed9eaf2febc93 (patch) | |
| tree | 5282229cd1ee4f8f7bb33d52a9433de5dc048700 /lib/CodeGen/MachineBasicBlock.cpp | |
| parent | 9d1747c3cd709cd5bbc1a07074550862d188527e (diff) | |
Fix a quadratic algorithm in MachineBranchProbabilityInfo.
The getSumForBlock function was quadratic in the number of successors
because getSuccWeight would perform a linear search for an already known
iterator.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161460 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineBasicBlock.cpp')
| -rw-r--r-- | lib/CodeGen/MachineBasicBlock.cpp | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp index f361d1ac29..2ba414dc6d 100644 --- a/lib/CodeGen/MachineBasicBlock.cpp +++ b/lib/CodeGen/MachineBasicBlock.cpp @@ -912,12 +912,11 @@ MachineBasicBlock::findDebugLoc(instr_iterator MBBI) { /// getSuccWeight - Return weight of the edge from this block to MBB. /// -uint32_t MachineBasicBlock::getSuccWeight(const MachineBasicBlock *succ) const { +uint32_t MachineBasicBlock::getSuccWeight(const_succ_iterator Succ) const { if (Weights.empty()) return 0; - const_succ_iterator I = std::find(Successors.begin(), Successors.end(), succ); - return *getWeightIterator(I); + return *getWeightIterator(Succ); } /// getWeightIterator - Return wight iterator corresonding to the I successor |