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AMDGPU: Stop creating unused virtual registers 

These are only used in the spill to VMEM path. Move them to
the one use.

llvm-svn: 285756
This commit is contained in:
Matt Arsenault 2016-11-01 21:58:07 +00:00
parent ec05a574fe
commit a6319b82ca
1 changed files with 5 additions and 2 deletions
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7
llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
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@ -491,7 +491,6 @@ void SIRegisterInfo::spillSGPR(MachineBasicBlock::iterator MI,
// SubReg carries the "Kill" flag when SubReg == SuperReg.
unsigned SubKillState = getKillRegState((NumSubRegs == 1) && IsKill);
for (unsigned i = 0, e = NumSubRegs; i < e; ++i) {
unsigned TmpReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
unsigned SubReg = NumSubRegs == 1 ?
SuperReg : getSubReg(SuperReg, getSubRegFromChannel(i));
@ -522,6 +521,10 @@ void SIRegisterInfo::spillSGPR(MachineBasicBlock::iterator MI,
} else {
// Spill SGPR to a frame index.
// FIXME we should use S_STORE_DWORD here for VI.
// TODO: Should VI try to spill to VGPR and then spill to SMEM?
unsigned TmpReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
MachineInstrBuilder Mov
= BuildMI(*MBB, MI, DL, TII->get(AMDGPU::V_MOV_B32_e32), TmpReg)
.addReg(SubReg, SubKillState);
@ -582,7 +585,6 @@ void SIRegisterInfo::restoreSGPR(MachineBasicBlock::iterator MI,
}
for (unsigned i = 0, e = NumSubRegs; i < e; ++i) {
unsigned TmpReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
unsigned SubReg = NumSubRegs == 1 ?
SuperReg : getSubReg(SuperReg, getSubRegFromChannel(i));
@ -600,6 +602,7 @@ void SIRegisterInfo::restoreSGPR(MachineBasicBlock::iterator MI,
// Restore SGPR from a stack slot.
// FIXME: We should use S_LOAD_DWORD here for VI.
unsigned TmpReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
unsigned Align = FrameInfo.getObjectAlignment(Index);
unsigned Size = FrameInfo.getObjectSize(Index);