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| author | Bob Wilson <bob.wilson@apple.com> | 2010-02-10 22:58:57 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2010-02-10 22:58:57 +0000 |
| commit | 0f52d0c074eadab209ff9a39c07ead783c45e031 (patch) | |
| tree | b295236f2869398d11136c96434082df050e8efe /llvm/lib/CodeGen/DeadMachineInstructionElim.cpp | |
| parent | 8bba1608bd3a0febc658eec09e1aa50cc64f1c1a (diff) | |
| download | bcm5719-llvm-0f52d0c074eadab209ff9a39c07ead783c45e031.tar.gz bcm5719-llvm-0f52d0c074eadab209ff9a39c07ead783c45e031.zip | |
Delete dead PHI machine instructions. These can be created due to type
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.
llvm-svn: 95816
Diffstat (limited to 'llvm/lib/CodeGen/DeadMachineInstructionElim.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/DeadMachineInstructionElim.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp b/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp index b0cb24d95f7..6e01e59349e 100644 --- a/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp +++ b/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp @@ -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. |
