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Delete dead PHI machine instructions. These can be created due to type

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legalization even when the IR-level optimizer has removed dead phis, such
as when the high half of an i64 value is unused on a 32-bit target.
I had to adjust a few test cases that had dead phis.
This is a partial fix for Radar 7627077.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95816 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2010-02-10 22:58:57 +00:00
parent b8ff934e94
commit 5e2b05a71e
3 changed files with 7 additions and 5 deletions
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lib/CodeGen/DeadMachineInstructionElim.cpp
+1 -1
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@@ -55,7 +55,7 @@ FunctionPass *llvm::createDeadMachineInstructionElimPass() {
bool DeadMachineInstructionElim::isDead(const MachineInstr *MI) const {
// Don't delete instructions with side effects.
bool SawStore = false;
if (!MI->isSafeToMove(TII, SawStore, 0))
if (!MI->isSafeToMove(TII, SawStore, 0) && !MI->isPHI())
return false;
// Examine each operand.