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LDRi12 machine instructions handle negative offset operands normally (simple

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integer values), not with the addrmode2 encoding.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117429 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2010-10-27 01:19:41 +00:00
parent 1b383ba6ae
commit 77aee8e22c
2 changed files with 14 additions and 4 deletions
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11
lib/Target/ARM/ARMBaseInstrInfo.cpp
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@ -1419,8 +1419,15 @@ bool llvm::rewriteARMFrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
if ((unsigned)Offset <= Mask * Scale) { if ((unsigned)Offset <= Mask * Scale) {
// Replace the FrameIndex with sp // Replace the FrameIndex with sp
MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false); MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
if (isSub) // FIXME: When addrmode2 goes away, this will simplify (like the
ImmedOffset |= 1 << NumBits; // T2 version), as the LDR.i12 versions don't need the encoding
// tricks for the offset value.
if (isSub) {
if (AddrMode == ARMII::AddrMode_i12)
ImmedOffset = -ImmedOffset;
else
ImmedOffset |= 1 << NumBits;
}
ImmOp.ChangeToImmediate(ImmedOffset); ImmOp.ChangeToImmediate(ImmedOffset);
Offset = 0; Offset = 0;
return true; return true;

7
lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
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@ -612,8 +612,11 @@ void ARMInstPrinter::printAddrModeImm12Operand(const MCInst *MI, unsigned OpNum,
O << "[" << getRegisterName(MO1.getReg()); O << "[" << getRegisterName(MO1.getReg());
unsigned OffImm = MO2.getImm(); int32_t OffImm = (int32_t)MO2.getImm();
if (OffImm) // Don't print +0. // Don't print +0.
if (OffImm < 0)
O << ", #-" << -OffImm;
else if (OffImm > 0)
O << ", #" << OffImm; O << ", #" << OffImm;
O << "]"; O << "]";
} }