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Refactor Reg-Reg copy emission routine for ARM. This makes cross-regclass copies weirdness more straightforward. Also, add GPR <-> SPR copy support. 

llvm-svn: 98887
This commit is contained in:
Anton Korobeynikov 2010-03-18 22:35:02 +00:00
parent 5e95aee159
commit 422dd6608a
1 changed files with 39 additions and 29 deletions
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68
llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
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@ -650,39 +650,49 @@ ARMBaseInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
if (SrcRC == ARM::tGPRRegisterClass)
SrcRC = ARM::GPRRegisterClass;
if (DestRC != SrcRC) {
if (DestRC->getSize() != SrcRC->getSize())
return false;
// Allow DPR / DPR_VFP2 / DPR_8 cross-class copies.
if (DestRC == ARM::DPR_8RegisterClass)
DestRC = ARM::DPR_VFP2RegisterClass;
if (SrcRC == ARM::DPR_8RegisterClass)
SrcRC = ARM::DPR_VFP2RegisterClass;
// Allow DPR / DPR_VFP2 / DPR_8 cross-class copies.
// Allow QPR / QPR_VFP2 / QPR_8 cross-class copies.
if (DestRC->getSize() != 8 && DestRC->getSize() != 16)
return false;
}
// Allow QPR / QPR_VFP2 / QPR_8 cross-class copies.
if (DestRC == ARM::QPR_VFP2RegisterClass ||
DestRC == ARM::QPR_8RegisterClass)
DestRC = ARM::QPRRegisterClass;
if (SrcRC == ARM::QPR_VFP2RegisterClass ||
SrcRC == ARM::QPR_8RegisterClass)
SrcRC = ARM::QPRRegisterClass;
// Disallow copies of unequal sizes.
if (DestRC != SrcRC && DestRC->getSize() != SrcRC->getSize())
return false;
if (DestRC == ARM::GPRRegisterClass) {
AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::MOVr),
DestReg).addReg(SrcReg)));
} else if (DestRC == ARM::SPRRegisterClass) {
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VMOVS), DestReg)
.addReg(SrcReg));
} else if (DestRC == ARM::DPRRegisterClass) {
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VMOVD), DestReg)
.addReg(SrcReg));
} else if (DestRC == ARM::DPR_VFP2RegisterClass ||
DestRC == ARM::DPR_8RegisterClass ||
SrcRC == ARM::DPR_VFP2RegisterClass ||
SrcRC == ARM::DPR_8RegisterClass) {
// Always use neon reg-reg move if source or dest is NEON-only regclass.
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VMOVDneon),
DestReg).addReg(SrcReg));
} else if (DestRC == ARM::QPRRegisterClass ||
DestRC == ARM::QPR_VFP2RegisterClass ||
DestRC == ARM::QPR_8RegisterClass) {
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VMOVQ),
DestReg).addReg(SrcReg));
if (SrcRC == ARM::SPRRegisterClass)
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VMOVRS), DestReg)
.addReg(SrcReg));
else
AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::MOVr),
DestReg).addReg(SrcReg)));
} else {
return false;
unsigned Opc;
if (DestRC == ARM::SPRRegisterClass)
Opc = (SrcRC == ARM::GPRRegisterClass ? ARM::VMOVSR : ARM::VMOVS);
else if (DestRC == ARM::DPRRegisterClass)
Opc = ARM::VMOVD;
else if (DestRC == ARM::DPR_VFP2RegisterClass ||
SrcRC == ARM::DPR_VFP2RegisterClass)
// Always use neon reg-reg move if source or dest is NEON-only regclass.
Opc = ARM::VMOVDneon;
else if (DestRC == ARM::QPRRegisterClass)
Opc = ARM::VMOVQ;
else
return false;
AddDefaultPred(BuildMI(MBB, I, DL, get(Opc), DestReg)
.addReg(SrcReg));
}
return true;