forked from OSchip/llvm-project
Fix bug in RegScavenger::scavengeRegister().
Reserved registers are not candidates for scavenging, and they were removed from the candidate list like this: CreateRegClassMask(RC, Candidates); Candidates ^= ReservedRegs; However, when there are reserved registers outside RC, this causes invalid bits to be set in Candidates. llvm-svn: 75847
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@ -426,7 +426,7 @@ unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
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// Mask off the registers which are not in the TargetRegisterClass.
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BitVector Candidates(NumPhysRegs, false);
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CreateRegClassMask(RC, Candidates);
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Candidates ^= ReservedRegs; // Do not include reserved registers.
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Candidates ^= ReservedRegs & Candidates; // Do not include reserved registers.
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// Exclude all the registers being used by the instruction.
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for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
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