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ARM: Clean up copyPhysReg() a bit.

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No functional change, just cleaning things up for readability.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193138 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2013-10-22 02:29:35 +00:00
parent 11d78777d5
commit 6c28682963
1 changed files with 47 additions and 27 deletions
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68
lib/Target/ARM/ARMBaseInstrInfo.cpp
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@ -690,26 +690,47 @@ void ARMBaseInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
int Spacing = 1;
// Use VORRq when possible.
if (ARM::QQPRRegClass.contains(DestReg, SrcReg))
Opc = ARM::VORRq, BeginIdx = ARM::qsub_0, SubRegs = 2;
else if (ARM::QQQQPRRegClass.contains(DestReg, SrcReg))
Opc = ARM::VORRq, BeginIdx = ARM::qsub_0, SubRegs = 4;
if (ARM::QQPRRegClass.contains(DestReg, SrcReg)) {
Opc = ARM::VORRq;
BeginIdx = ARM::qsub_0;
SubRegs = 2;
} else if (ARM::QQQQPRRegClass.contains(DestReg, SrcReg)) {
Opc = ARM::VORRq;
BeginIdx = ARM::qsub_0;
SubRegs = 4;
// Fall back to VMOVD.
else if (ARM::DPairRegClass.contains(DestReg, SrcReg))
Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 2;
else if (ARM::DTripleRegClass.contains(DestReg, SrcReg))
Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 3;
else if (ARM::DQuadRegClass.contains(DestReg, SrcReg))
Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 4;
else if (ARM::GPRPairRegClass.contains(DestReg, SrcReg))
Opc = ARM::MOVr, BeginIdx = ARM::gsub_0, SubRegs = 2;
else if (ARM::DPairSpcRegClass.contains(DestReg, SrcReg))
Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 2, Spacing = 2;
else if (ARM::DTripleSpcRegClass.contains(DestReg, SrcReg))
Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 3, Spacing = 2;
else if (ARM::DQuadSpcRegClass.contains(DestReg, SrcReg))
Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 4, Spacing = 2;
} else if (ARM::DPairRegClass.contains(DestReg, SrcReg)) {
Opc = ARM::VMOVD;
BeginIdx = ARM::dsub_0;
SubRegs = 2;
} else if (ARM::DTripleRegClass.contains(DestReg, SrcReg)) {
Opc = ARM::VMOVD;
BeginIdx = ARM::dsub_0;
SubRegs = 3;
} else if (ARM::DQuadRegClass.contains(DestReg, SrcReg)) {
Opc = ARM::VMOVD;
BeginIdx = ARM::dsub_0;
SubRegs = 4;
} else if (ARM::GPRPairRegClass.contains(DestReg, SrcReg)) {
Opc = ARM::MOVr;
BeginIdx = ARM::gsub_0;
SubRegs = 2;
} else if (ARM::DPairSpcRegClass.contains(DestReg, SrcReg)) {
Opc = ARM::VMOVD;
BeginIdx = ARM::dsub_0;
SubRegs = 2;
Spacing = 2;
} else if (ARM::DTripleSpcRegClass.contains(DestReg, SrcReg)) {
Opc = ARM::VMOVD;
BeginIdx = ARM::dsub_0;
SubRegs = 3;
Spacing = 2;
} else if (ARM::DQuadSpcRegClass.contains(DestReg, SrcReg)) {
Opc = ARM::VMOVD;
BeginIdx = ARM::dsub_0;
SubRegs = 4;
Spacing = 2;
}
assert(Opc && "Impossible reg-to-reg copy");
@ -718,22 +739,21 @@ void ARMBaseInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
// Copy register tuples backward when the first Dest reg overlaps with SrcReg.
if (TRI->regsOverlap(SrcReg, TRI->getSubReg(DestReg, BeginIdx))) {
BeginIdx = BeginIdx + ((SubRegs-1)*Spacing);
BeginIdx = BeginIdx + ((SubRegs - 1) * Spacing);
Spacing = -Spacing;
}
#ifndef NDEBUG
SmallSet<unsigned, 4> DstRegs;
#endif
for (unsigned i = 0; i != SubRegs; ++i) {
unsigned Dst = TRI->getSubReg(DestReg, BeginIdx + i*Spacing);
unsigned Src = TRI->getSubReg(SrcReg, BeginIdx + i*Spacing);
unsigned Dst = TRI->getSubReg(DestReg, BeginIdx + i * Spacing);
unsigned Src = TRI->getSubReg(SrcReg, BeginIdx + i * Spacing);
assert(Dst && Src && "Bad sub-register");
#ifndef NDEBUG
assert(!DstRegs.count(Src) && "destructive vector copy");
DstRegs.insert(Dst);
#endif
Mov = BuildMI(MBB, I, I->getDebugLoc(), get(Opc), Dst)
.addReg(Src);
Mov = BuildMI(MBB, I, I->getDebugLoc(), get(Opc), Dst).addReg(Src);
// VORR takes two source operands.
if (Opc == ARM::VORRq)
Mov.addReg(Src);