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Fix issue in regscavenger when scavenging a callee-saved register that has not been spilled.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77912 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2009-08-02 20:29:41 +00:00
parent 7b4e503cdc
commit b36eb9df20
2 changed files with 11 additions and 4 deletions
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9
lib/CodeGen/RegisterScavenging.cpp
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@@ -471,9 +471,16 @@ unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
Reg = Candidates.find_next(Reg);
}
assert(ScavengedReg == 0 &&
assert(ScavengedReg == 0 &&
"Scavenger slot is live, unable to scavenge another register!");
// Make sure SReg is marked as used. It could be considered available if it is
// one of the callee saved registers, but hasn't been spilled.
if (!isUsed(SReg)) {
MBB->addLiveIn(SReg);
setUsed(SReg);
}
// Spill the scavenged register before I.
TII->storeRegToStackSlot(*MBB, I, SReg, true, ScavengingFrameIndex, RC);
MachineBasicBlock::iterator II = prior(I);