CriticalAntiDepBreaker: BasicBlock::size is an expensive operation, reuse the cached value.
No functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152927 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CriticalAntiDepBreaker.cpp b/lib/CodeGen/CriticalAntiDepBreaker.cpp
index c684cdc..cf8c71d 100644
--- a/lib/CodeGen/CriticalAntiDepBreaker.cpp
+++ b/lib/CodeGen/CriticalAntiDepBreaker.cpp
@@ -54,7 +54,7 @@
// 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 @@
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 @@
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 @@
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;
}
}