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CriticalAntiDepBreaker: BasicBlock::size is an expensive operation, reuse the cached value.

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No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152927 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-03-16 15:46:47 +00:00
parent bb0b6eddaf
commit 87f3dbc446
1 changed files with 7 additions and 7 deletions
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14
lib/CodeGen/CriticalAntiDepBreaker.cpp
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@ -54,7 +54,7 @@ void CriticalAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
// Clear "do not change" set.
KeepRegs.clear();
bool IsReturnBlock = (!BB->empty() && BB->back().isReturn());
bool IsReturnBlock = (BBSize != 0 && BB->back().isReturn());
// Determine the live-out physregs for this block.
if (IsReturnBlock) {
@ -63,14 +63,14 @@ void CriticalAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
E = MRI.liveout_end(); I != E; ++I) {
unsigned Reg = *I;
Classes[Reg] = reinterpret_cast<TargetRegisterClass *>(-1);
KillIndices[Reg] = BB->size();
KillIndices[Reg] = BBSize;
DefIndices[Reg] = ~0u;
// Repeat, for all aliases.
for (const uint16_t *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) {
unsigned AliasReg = *Alias;
Classes[AliasReg] = reinterpret_cast<TargetRegisterClass *>(-1);
KillIndices[AliasReg] = BB->size();
KillIndices[AliasReg] = BBSize;
DefIndices[AliasReg] = ~0u;
}
}
@ -85,14 +85,14 @@ void CriticalAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
E = (*SI)->livein_end(); I != E; ++I) {
unsigned Reg = *I;
Classes[Reg] = reinterpret_cast<TargetRegisterClass *>(-1);
KillIndices[Reg] = BB->size();
KillIndices[Reg] = BBSize;
DefIndices[Reg] = ~0u;
// Repeat, for all aliases.
for (const uint16_t *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) {
unsigned AliasReg = *Alias;
Classes[AliasReg] = reinterpret_cast<TargetRegisterClass *>(-1);
KillIndices[AliasReg] = BB->size();
KillIndices[AliasReg] = BBSize;
DefIndices[AliasReg] = ~0u;
}
}
@ -106,14 +106,14 @@ void CriticalAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
unsigned Reg = *I;
if (!IsReturnBlock && !Pristine.test(Reg)) continue;
Classes[Reg] = reinterpret_cast<TargetRegisterClass *>(-1);
KillIndices[Reg] = BB->size();
KillIndices[Reg] = BBSize;
DefIndices[Reg] = ~0u;
// Repeat, for all aliases.
for (const uint16_t *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) {
unsigned AliasReg = *Alias;
Classes[AliasReg] = reinterpret_cast<TargetRegisterClass *>(-1);
KillIndices[AliasReg] = BB->size();
KillIndices[AliasReg] = BBSize;
DefIndices[AliasReg] = ~0u;
}
}