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Fix for PR18396: Assertion: MO->isDead "Cannot fold physreg def".

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InlineSpiller::foldMemoryOperand needs to handle undef call operands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198679 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2014-01-07 07:31:10 +00:00
parent b4e0c9b85d
commit 9c15f4c9c9
2 changed files with 51 additions and 4 deletions
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lib/CodeGen/InlineSpiller.cpp
+3 -4
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@@ -1098,12 +1098,11 @@ foldMemoryOperand(ArrayRef<std::pair<MachineInstr*, unsigned> > Ops,
MRI.isReserved(Reg)) {
continue;
}
// Skip non-Defs, including undef uses and internal reads.
if (MO->isUse())
continue;
MIBundleOperands::PhysRegInfo RI =
MIBundleOperands(FoldMI).analyzePhysReg(Reg, &TRI);
if (MO->readsReg()) {
assert(RI.Reads && "Cannot fold physreg reader");
continue;
}
if (RI.Defines)
continue;
// FoldMI does not define this physreg. Remove the LI segment.