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Thumb2 ldm/stm updating w/ one register in the list are LDR/STR. 

rdar://10429490

llvm-svn: 144338
This commit is contained in:
Jim Grosbach 2011-11-10 23:58:34 +00:00
parent afad053141
commit d9a9be269c
1 changed files with 32 additions and 0 deletions
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32
llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
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@ -4590,6 +4590,38 @@ processInstruction(MCInst &Inst,
Inst = TmpInst;
return true;
}
case ARM::t2LDMIA_UPD: {
// If this is a load of a single register, then we should use
// a post-indexed LDR instruction instead, per the ARM ARM.
if (Inst.getNumOperands() != 5)
return false;
MCInst TmpInst;
TmpInst.setOpcode(ARM::t2LDR_POST);
TmpInst.addOperand(Inst.getOperand(4)); // Rt
TmpInst.addOperand(Inst.getOperand(0)); // Rn_wb
TmpInst.addOperand(Inst.getOperand(1)); // Rn
TmpInst.addOperand(MCOperand::CreateImm(4));
TmpInst.addOperand(Inst.getOperand(2)); // CondCode
TmpInst.addOperand(Inst.getOperand(3));
Inst = TmpInst;
return true;
}
case ARM::t2STMDB_UPD: {
// If this is a store of a single register, then we should use
// a pre-indexed STR instruction instead, per the ARM ARM.
if (Inst.getNumOperands() != 5)
return false;
MCInst TmpInst;
TmpInst.setOpcode(ARM::t2STR_PRE);
TmpInst.addOperand(Inst.getOperand(0)); // Rn_wb
TmpInst.addOperand(Inst.getOperand(4)); // Rt
TmpInst.addOperand(Inst.getOperand(1)); // Rn
TmpInst.addOperand(MCOperand::CreateImm(-4));
TmpInst.addOperand(Inst.getOperand(2)); // CondCode
TmpInst.addOperand(Inst.getOperand(3));
Inst = TmpInst;
return true;
}
case ARM::LDMIA_UPD:
// If this is a load of a single register via a 'pop', then we should use
// a post-indexed LDR instruction instead, per the ARM ARM.