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[LiveVariables] Replace std::vector with SmallVector.

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Replace std::vector with SmallVector to reduce the number of mallocs.
This method is frequently executed, and the number of elements in the
vector is typically small.

https://reviews.llvm.org/D83920
This commit is contained in:
Nadav Rotem 2020-07-15 17:12:48 -07:00
parent 9ac94b78c6
commit 875d6beaad
2 changed files with 7 additions and 7 deletions
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3
include/llvm/CodeGen/LiveVariables.h
View File

@ -276,7 +276,8 @@ public:
MachineBasicBlock *BB);
void MarkVirtRegAliveInBlock(VarInfo &VRInfo, MachineBasicBlock *DefBlock,
MachineBasicBlock *BB,
std::vector<MachineBasicBlock*> &WorkList);
SmallVectorImpl<MachineBasicBlock *> &WorkList);
void HandleVirtRegDef(unsigned reg, MachineInstr &MI);
void HandleVirtRegUse(unsigned reg, MachineBasicBlock *MBB, MachineInstr &MI);

9
lib/CodeGen/LiveVariables.cpp
View File

@ -89,10 +89,9 @@ LiveVariables::VarInfo &LiveVariables::getVarInfo(unsigned RegIdx) {
return VirtRegInfo[RegIdx];
}
void LiveVariables::MarkVirtRegAliveInBlock(VarInfo& VRInfo,
MachineBasicBlock *DefBlock,
MachineBasicBlock *MBB,
std::vector<MachineBasicBlock*> &WorkList) {
void LiveVariables::MarkVirtRegAliveInBlock(
VarInfo &VRInfo, MachineBasicBlock *DefBlock, MachineBasicBlock *MBB,
SmallVectorImpl<MachineBasicBlock *> &WorkList) {
unsigned BBNum = MBB->getNumber();
// Check to see if this basic block is one of the killing blocks. If so,
@ -118,7 +117,7 @@ void LiveVariables::MarkVirtRegAliveInBlock(VarInfo& VRInfo,
void LiveVariables::MarkVirtRegAliveInBlock(VarInfo &VRInfo,
MachineBasicBlock *DefBlock,
MachineBasicBlock *MBB) {
std::vector<MachineBasicBlock*> WorkList;
SmallVector<MachineBasicBlock *, 16> WorkList;
MarkVirtRegAliveInBlock(VRInfo, DefBlock, MBB, WorkList);
while (!WorkList.empty()) {