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ARM: support expanding external symbols in 32-bit moves

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This enhances the expansion of the mov32imm pseudo-instruction to support an
external symbol reference.  This is motivated by a simplification of the stack
probe emission for Windows on ARM (and fixing a leak).

llvm-svn: 207736
This commit is contained in:
Saleem Abdulrasool 2014-05-01 04:19:56 +00:00
parent 3e92744bc0
commit 319589a5f5
1 changed files with 14 additions and 2 deletions
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16
lib/Target/ARM/ARMExpandPseudoInsts.cpp
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@ -705,17 +705,29 @@ void ARMExpandPseudo::ExpandMOV32BitImm(MachineBasicBlock &MBB,
.addReg(DstReg, RegState::Define | getDeadRegState(DstIsDead))
.addReg(DstReg);
if (MO.isImm()) {
switch (MO.getType()) {
case MachineOperand::MO_Immediate: {
unsigned Imm = MO.getImm();
unsigned Lo16 = Imm & 0xffff;
unsigned Hi16 = (Imm >> 16) & 0xffff;
LO16 = LO16.addImm(Lo16);
HI16 = HI16.addImm(Hi16);
} else {
break;
}
case MachineOperand::MO_ExternalSymbol: {
const char *ES = MO.getSymbolName();
unsigned TF = MO.getTargetFlags();
LO16 = LO16.addExternalSymbol(ES, TF | ARMII::MO_LO16);
HI16 = HI16.addExternalSymbol(ES, TF | ARMII::MO_HI16);
break;
}
default: {
const GlobalValue *GV = MO.getGlobal();
unsigned TF = MO.getTargetFlags();
LO16 = LO16.addGlobalAddress(GV, MO.getOffset(), TF | ARMII::MO_LO16);
HI16 = HI16.addGlobalAddress(GV, MO.getOffset(), TF | ARMII::MO_HI16);
break;
}
}
LO16->setMemRefs(MI.memoperands_begin(), MI.memoperands_end());