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Fix for PR12090: clear def maps of aliases when visiting a copy. e.g.

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%S5<def> = COPY %S0<kill>
First clear def map of Q1, etc.

No small test case available.

llvm-svn: 151574
This commit is contained in:
Evan Cheng 2012-02-27 21:46:42 +00:00
parent 02bf78f5ca
commit 9627003887
1 changed files with 5 additions and 0 deletions
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5
lib/CodeGen/MachineCopyPropagation.cpp
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@ -199,6 +199,11 @@ bool MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) {
SourceNoLongerAvailable(Def, SrcMap, AvailCopyMap);
// Remember Def is defined by the copy.
// ... Make sure to clear the def maps of aliases first.
for (const unsigned *AS = TRI->getAliasSet(Def); *AS; ++AS) {
CopyMap.erase(*AS);
AvailCopyMap.erase(*AS);
}
CopyMap[Def] = MI;
AvailCopyMap[Def] = MI;
for (const unsigned *SR = TRI->getSubRegisters(Def); *SR; ++SR) {