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| author | Matthias Braun <matze@braunis.de> | 2015-02-04 19:35:16 +0000 |
|---|---|---|
| committer | Matthias Braun <matze@braunis.de> | 2015-02-04 19:35:16 +0000 |
| commit | 26e7ea62674592a7626e21412a03f24b01089876 (patch) | |
| tree | 1e13ae35e05cf305cb5b944602a61d2cf26df042 /llvm/lib/CodeGen/MachineInstr.cpp | |
| parent | dfa9032f6471da2fdd572832b02644fa8c36a487 (diff) | |
| download | llvm-26e7ea62674592a7626e21412a03f24b01089876.zip llvm-26e7ea62674592a7626e21412a03f24b01089876.tar.gz llvm-26e7ea62674592a7626e21412a03f24b01089876.tar.bz2 | |
MachineCSE: Clear dead-def flag on CSE.
In case CSE reuses a previoulsy unused register the dead-def flag has to
be cleared on the def operand, as exposed by the arm64-cse.ll test.
This fixes PR22439 and the corresponding rdar://19694987
Differential Revision: http://reviews.llvm.org/D7395
llvm-svn: 228178
Diffstat (limited to 'llvm/lib/CodeGen/MachineInstr.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineInstr.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp index 470d6cb..f863bb8 100644 --- a/llvm/lib/CodeGen/MachineInstr.cpp +++ b/llvm/lib/CodeGen/MachineInstr.cpp @@ -1889,6 +1889,14 @@ bool MachineInstr::addRegisterDead(unsigned Reg, return true; } +void MachineInstr::clearRegisterDeads(unsigned Reg) { + for (MachineOperand &MO : operands()) { + if (!MO.isReg() || !MO.isDef() || MO.getReg() != Reg) + continue; + MO.setIsDead(false); + } +} + void MachineInstr::addRegisterDefReadUndef(unsigned Reg) { for (MachineOperand &MO : operands()) { if (!MO.isReg() || !MO.isDef() || MO.getReg() != Reg || MO.getSubReg() == 0) |