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Fix PR10387.
When trying to rematerialize a value before an instruction that has an early-clobber redefine of the virtual register, make sure to look up the correct value number. Early-clobber defs are moved one slot back, so getBaseIndex is needed to find the used value number. Bugpoint was unable to reduce the test case for this, see PR10388. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135378 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -637,7 +637,7 @@ void InlineSpiller::markValueUsed(LiveInterval *LI, VNInfo *VNI) {
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bool InlineSpiller::reMaterializeFor(LiveInterval &VirtReg,
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MachineBasicBlock::iterator MI) {
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SlotIndex UseIdx = LIS.getInstructionIndex(MI).getUseIndex();
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VNInfo *ParentVNI = VirtReg.getVNInfoAt(UseIdx);
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VNInfo *ParentVNI = VirtReg.getVNInfoAt(UseIdx.getBaseIndex());
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if (!ParentVNI) {
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DEBUG(dbgs() << "\tadding <undef> flags: ");
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