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Fix pr4544. When remating, make sure the destination register fits the instruction definition. It may be mismatched due to sub-register coalescing.

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No test case yet because the code doesn't trigger until 75408 is re-applied.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75572 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-07-14 00:51:06 +00:00
parent 4458ab0d83
commit 5ad147281a
1 changed files with 11 additions and 0 deletions
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11
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -611,6 +611,17 @@ bool SimpleRegisterCoalescing::ReMaterializeTrivialDef(LiveInterval &SrcInt,
bool SawStore = false;
if (!DefMI->isSafeToMove(tii_, SawStore))
return false;
if (TID.getNumDefs() != 1)
return false;
// Make sure the copy destination register class fits the instruction
// definition register class. The mismatch can happen as a result of earlier
// extract_subreg, insert_subreg, subreg_to_reg coalescing.
const TargetRegisterClass *RC = getInstrOperandRegClass(tri_, TID, 0);
if (TargetRegisterInfo::isVirtualRegister(DstReg)) {
if (mri_->getRegClass(DstReg) != RC)
return false;
} else if (!RC->contains(DstReg))
return false;
unsigned DefIdx = li_->getDefIndex(CopyIdx);
const LiveRange *DLR= li_->getInterval(DstReg).getLiveRangeContaining(DefIdx);