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MachineRegisterInfo: Remove UsedPhysReg infrastructure

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We have a detailed def/use lists for every physical register in
MachineRegisterInfo anyway, so there is little use in maintaining an
additional bitset of which ones are used.

Removing it frees us from extra book keeping. This simplifies
VirtRegMap.

Differential Revision: http://reviews.llvm.org/D10911

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242173 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2015-07-14 17:52:07 +00:00
parent 230c4739b3
commit 2addf067a2
18 changed files with 23 additions and 179 deletions
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lib/Target/AArch64/AArch64FrameLowering.cpp
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@ -354,7 +354,6 @@ void AArch64FrameLowering::emitPrologue(MachineFunction &MF,
if (NumBytes && NeedsRealignment) {
// Use the first callee-saved register as a scratch register.
scratchSPReg = AArch64::X9;
MF.getRegInfo().setPhysRegUsed(scratchSPReg);
}
// If we're a leaf function, try using the red zone.