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| author | Dan Gohman <gohman@apple.com> | 2008-09-18 18:22:32 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-09-18 18:22:32 +0000 |
| commit | e251b1529f40131ce5931420448a1e847f42e4af (patch) | |
| tree | d2621719bc0cfb8a7ee93ace05464e4dd6387257 /lib/CodeGen | |
| parent | 6a0fd93547ec6d08f767e9315a8565cf1abb356f (diff) | |
| download | llvm-e251b1529f40131ce5931420448a1e847f42e4af.tar.gz llvm-e251b1529f40131ce5931420448a1e847f42e4af.tar.bz2 llvm-e251b1529f40131ce5931420448a1e847f42e4af.tar.xz | |
Don't consider instructions with implicit physical register
defs to be necessarily live.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56310 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/DeadMachineInstructionElim.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp index a3bba61e4a..8b9cf05d67 100644 --- a/lib/CodeGen/DeadMachineInstructionElim.cpp +++ b/lib/CodeGen/DeadMachineInstructionElim.cpp @@ -64,7 +64,8 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) { const MachineOperand &MO = MI->getOperand(i); if (MO.isRegister() && MO.isDef()) { unsigned Reg = MO.getReg(); - if (TargetRegisterInfo::isPhysicalRegister(Reg) || + if ((!MO.isImplicit() && + TargetRegisterInfo::isPhysicalRegister(Reg)) || !MRI.use_empty(Reg)) { // This def has a use. Don't delete the instruction! AllDefsDead = false; |