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Add additional assert() to verify no extraneous use of a scavenged register.

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llvm-svn: 83163
This commit is contained in:
Jim Grosbach 2009-09-30 20:35:36 +00:00
parent 24270e88cc
commit b4fdc9252d
1 changed files with 9 additions and 2 deletions
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11
lib/CodeGen/PrologEpilogInserter.cpp
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@ -744,8 +744,15 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i)
if (MI->getOperand(i).isReg()) { if (MI->getOperand(i).isReg()) {
unsigned Reg = MI->getOperand(i).getReg(); unsigned Reg = MI->getOperand(i).getReg();
if (Reg == 0 || !TargetRegisterInfo::isVirtualRegister(Reg)) if (Reg == 0)
continue; continue;
if (!TargetRegisterInfo::isVirtualRegister(Reg)) {
// If we have an active scavenged register, we shouldn't be
// seeing any references to it.
assert (Reg != CurrentScratchReg
&& "overlapping use of scavenged frame index register!");
continue;
}
// If we already have a scratch for this virtual register, use it // If we already have a scratch for this virtual register, use it
if (Reg != CurrentVirtReg) { if (Reg != CurrentVirtReg) {
@ -770,7 +777,7 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
// If this is the last use of the register, stop tracking it. // If this is the last use of the register, stop tracking it.
if (MI->getOperand(i).isKill()) if (MI->getOperand(i).isKill())
CurrentVirtReg = 0; CurrentScratchReg = CurrentVirtReg = 0;
} }
RS->forward(MI); RS->forward(MI);
} }