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Fix PR6520. An earlyclobber physreg must not be allocated to anything else.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103133 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-05-05 23:07:41 +00:00
parent 08bbda3811
commit 51bfd452d5
2 changed files with 43 additions and 2 deletions
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14
lib/CodeGen/RegAllocLocal.cpp
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@@ -843,8 +843,18 @@ void RALocal::AllocateBasicBlock(MachineBasicBlock &MBB) {
SmallVector<unsigned, 8> Kills;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = MI->getOperand(i);
if (!MO.isReg() || !MO.isKill()) continue;
if (!MO.isReg()) continue;
unsigned Reg = MO.getReg();
if (!Reg) continue;
// Avoid allocating assigned early clobbers below.
if (MO.isEarlyClobber() && TargetRegisterInfo::isPhysicalRegister(Reg)) {
spillPhysReg(MBB, MI, Reg, true); // Spill any existing value in reg
PhysRegsUsed[Reg] = 0; // It is free and reserved now
AddToPhysRegsUseOrder(Reg);
}
if (!MO.isKill()) continue;
if (!MO.isImplicit())
Kills.push_back(MO.getReg());
else if (!isReadModWriteImplicitKill(MI, MO.getReg()))