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[AVR] Implement LPMWRdZ pseudo-instruction's expansion.

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FIXME: implementation is mostly copy-pasted from LDWRdPtr, so we should
refactor a bit and unify the two

Patch by Gerdo Erdi.

llvm-svn: 314898
This commit is contained in:
Dylan McKay 2017-10-04 10:37:22 +00:00
parent 569e524df6
commit 680a47c4f6
1 changed files with 44 additions and 1 deletions
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45
lib/Target/AVR/AVRExpandPseudoInsts.cpp
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@ -743,7 +743,50 @@ bool AVRExpandPseudo::expand<AVR::LDDWRdPtrQ>(Block &MBB, BlockIt MBBI) {
template <>
bool AVRExpandPseudo::expand<AVR::LPMWRdZ>(Block &MBB, BlockIt MBBI) {
llvm_unreachable("wide LPM is unimplemented");
MachineInstr &MI = *MBBI;
unsigned OpLo, OpHi, DstLoReg, DstHiReg;
unsigned DstReg = MI.getOperand(0).getReg();
unsigned TmpReg = 0; // 0 for no temporary register
unsigned SrcReg = MI.getOperand(1).getReg();
bool SrcIsKill = MI.getOperand(1).isKill();
OpLo = AVR::LPMRdZPi;
OpHi = AVR::LPMRdZ;
TRI->splitReg(DstReg, DstLoReg, DstHiReg);
// Use a temporary register if src and dst registers are the same.
if (DstReg == SrcReg)
TmpReg = scavengeGPR8(MI);
unsigned CurDstLoReg = (DstReg == SrcReg) ? TmpReg : DstLoReg;
unsigned CurDstHiReg = (DstReg == SrcReg) ? TmpReg : DstHiReg;
// Load low byte.
auto MIBLO = buildMI(MBB, MBBI, OpLo)
.addReg(CurDstLoReg, RegState::Define)
.addReg(SrcReg);
// Push low byte onto stack if necessary.
if (TmpReg)
buildMI(MBB, MBBI, AVR::PUSHRr).addReg(TmpReg);
// Load high byte.
auto MIBHI = buildMI(MBB, MBBI, OpHi)
.addReg(CurDstHiReg, RegState::Define)
.addReg(SrcReg, getKillRegState(SrcIsKill));
if (TmpReg) {
// Move the high byte into the final destination.
buildMI(MBB, MBBI, AVR::MOVRdRr).addReg(DstHiReg).addReg(TmpReg);
// Move the low byte from the scratch space into the final destination.
buildMI(MBB, MBBI, AVR::POPRd).addReg(DstLoReg);
}
MIBLO->setMemRefs(MI.memoperands_begin(), MI.memoperands_end());
MIBHI->setMemRefs(MI.memoperands_begin(), MI.memoperands_end());
MI.eraseFromParent();
return true;
}
template <>