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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 | 5e2b05a71e81b28712b77419f68657462494e103 (patch) | |
| tree | 8029ae1969d5fb607781fba7e98b005022475af7 /lib/CodeGen/DeadMachineInstructionElim.cpp | |
| parent | b8ff934e94637462901ebd1c849aeaf71350dacc (diff) | |
| download | external_llvm-5e2b05a71e81b28712b77419f68657462494e103.zip external_llvm-5e2b05a71e81b28712b77419f68657462494e103.tar.gz external_llvm-5e2b05a71e81b28712b77419f68657462494e103.tar.bz2 | |
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95816 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/DeadMachineInstructionElim.cpp')
| -rw-r--r-- | lib/CodeGen/DeadMachineInstructionElim.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp index b0cb24d..6e01e59 100644 --- a/lib/CodeGen/DeadMachineInstructionElim.cpp +++ b/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. |