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[Cleanup] Utility function to erase instruction and mark DBG_Values

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New function to erase a machine instruction and mark DBG_VALUE
for removal. A DBG_VALUE is marked for removal when it references
an operand defined in the instruction.
Use the new function to cleanup code in dead machine instruction
removal pass.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215580 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gerolf Hoflehner
2014-08-13 21:15:23 +00:00
parent 49128636b6
commit 4e917a2923
3 changed files with 30 additions and 12 deletions
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15
lib/CodeGen/DeadMachineInstructionElim.cpp
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@@ -124,19 +124,10 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) {
if (isDead(MI)) {
DEBUG(dbgs() << "DeadMachineInstructionElim: DELETING: " << *MI);
// It is possible that some DBG_VALUE instructions refer to this
// instruction. Examine each def operand for such references;
// if found, mark the DBG_VALUE as undef (but don't delete it).
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
if (!MO.isReg() || !MO.isDef())
continue;
unsigned Reg = MO.getReg();
if (!TargetRegisterInfo::isVirtualRegister(Reg))
continue;
MRI->markUsesInDebugValueAsUndef(Reg);
}
// instruction. They get marked as undef and will be deleted
// in the live debug variable analysis.
MI->eraseFromParentAndMarkDBGValuesForRemoval();
AnyChanges = true;
MI->eraseFromParent();
++NumDeletes;
MIE = MBB->rend();
// MII is now pointing to the next instruction to process,