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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-03-16 15:46:47 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-03-16 15:46:47 +0000 |
| commit | 8e5af375dbfa3e3f073a7e402fd02a65f11c928a (patch) | |
| tree | ce11a8217e66ca1c80456ccb004e58f22cc664d4 /llvm/lib/CodeGen | |
| parent | b4c7522790633d86372a40d274148e13fb569e9f (diff) | |
| download | bcm5719-llvm-8e5af375dbfa3e3f073a7e402fd02a65f11c928a.tar.gz bcm5719-llvm-8e5af375dbfa3e3f073a7e402fd02a65f11c928a.zip | |
CriticalAntiDepBreaker: BasicBlock::size is an expensive operation, reuse the cached value.
No functionality change.
llvm-svn: 152927
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp b/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp index c684cdcd1b1..cf8c71dab2f 100644 --- a/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp +++ b/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp @@ -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; } } |
