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Remove MachineRegisterInfo::getLastVirtReg(), it was giving wrong results

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when no virtual registers have been allocated.

It was only used to resize IndexedMaps, so provide an IndexedMap::resize()
method such that

 Map.grow(MRI.getLastVirtReg());

can be replaced with the simpler

 Map.resize(MRI.getNumVirtRegs());

This works correctly when no virtuals are allocated, and it bypasses the to/from
index conversions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123130 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-01-09 21:58:20 +00:00
parent 9dddf08eb8
commit 42e9c96392
4 changed files with 14 additions and 17 deletions
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lib/CodeGen/VirtRegMap.cpp
+8 -8
View File
@@ -88,14 +88,14 @@ bool VirtRegMap::runOnMachineFunction(MachineFunction &mf) {
}
void VirtRegMap::grow() {
unsigned LastVirtReg = MF->getRegInfo().getLastVirtReg();
Virt2PhysMap.grow(LastVirtReg);
Virt2StackSlotMap.grow(LastVirtReg);
Virt2ReMatIdMap.grow(LastVirtReg);
Virt2SplitMap.grow(LastVirtReg);
Virt2SplitKillMap.grow(LastVirtReg);
ReMatMap.grow(LastVirtReg);
ImplicitDefed.resize(MF->getRegInfo().getNumVirtRegs());
unsigned NumRegs = MF->getRegInfo().getNumVirtRegs();
Virt2PhysMap.resize(NumRegs);
Virt2StackSlotMap.resize(NumRegs);
Virt2ReMatIdMap.resize(NumRegs);
Virt2SplitMap.resize(NumRegs);
Virt2SplitKillMap.resize(NumRegs);
ReMatMap.resize(NumRegs);
ImplicitDefed.resize(NumRegs);
}
unsigned VirtRegMap::createSpillSlot(const TargetRegisterClass *RC) {