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Handle AddrMode4 for Thumb2 in rewriteT2FrameIndex. This occurs for

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VLDM/VSTM instructions, and without this check, the code assumes that an
offset is allowed, as it would be with VLDR/VSTR.  The asm printer,
however, silently drops the offset, producing incorrect code.  Since the
address register in this case is either the stack or frame pointer, the
spill location ends up conflicting with some other stack slot or with
outgoing arguments on the stack.

llvm-svn: 81879
This commit is contained in:
Bob Wilson 2009-09-15 17:56:18 +00:00
parent 7727a68464
commit a42ff3190c
1 changed files with 5 additions and 0 deletions
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5
lib/Target/ARM/Thumb2InstrInfo.cpp
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@ -383,6 +383,11 @@ bool llvm::rewriteT2FrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
"Bit extraction didn't work?");
MI.getOperand(FrameRegIdx+1).ChangeToImmediate(ThisImmVal);
} else {
// AddrMode4 cannot handle any offset.
if (AddrMode == ARMII::AddrMode4)
return false;
// AddrModeT2_so cannot handle any offset. If there is no offset
// register then we change to an immediate version.
unsigned NewOpc = Opcode;