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Fix PR10387.

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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
This commit is contained in:
Jakob Stoklund Olesen 2011-07-18 05:31:59 +00:00
parent d132430967
commit 7941350101
1 changed files with 1 additions and 1 deletions
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lib/CodeGen/InlineSpiller.cpp
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@ -637,7 +637,7 @@ void InlineSpiller::markValueUsed(LiveInterval *LI, VNInfo *VNI) {
bool InlineSpiller::reMaterializeFor(LiveInterval &VirtReg,
MachineBasicBlock::iterator MI) {
SlotIndex UseIdx = LIS.getInstructionIndex(MI).getUseIndex();
VNInfo *ParentVNI = VirtReg.getVNInfoAt(UseIdx);
VNInfo *ParentVNI = VirtReg.getVNInfoAt(UseIdx.getBaseIndex());
if (!ParentVNI) {
DEBUG(dbgs() << "\tadding <undef> flags: ");