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Fix bug in RegScavenger::scavengeRegister().

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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75847 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2009-07-15 22:32:11 +00:00
parent 0d7c695c74
commit 72fbc3d9d2
1 changed files with 1 additions and 1 deletions
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2
lib/CodeGen/RegisterScavenging.cpp
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@ -426,7 +426,7 @@ unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
// Mask off the registers which are not in the TargetRegisterClass.
BitVector Candidates(NumPhysRegs, false);
CreateRegClassMask(RC, Candidates);
Candidates ^= ReservedRegs; // Do not include reserved registers.
Candidates ^= ReservedRegs & Candidates; // Do not include reserved registers.
// Exclude all the registers being used by the instruction.
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {