diff options
Diffstat (limited to 'lib/CodeGen/MachineCSE.cpp')
| -rw-r--r-- | lib/CodeGen/MachineCSE.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp index 5153abbc4e..993975ef0e 100644 --- a/lib/CodeGen/MachineCSE.cpp +++ b/lib/CodeGen/MachineCSE.cpp @@ -215,8 +215,11 @@ bool MachineCSE::hasLivePhysRegDefUses(const MachineInstr *MI, if (MO.isDef() && (MO.isDead() || isPhysDefTriviallyDead(Reg, I, MBB->end()))) continue; - for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI) - PhysRefs.insert(*AI); + for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI) { + // Reading constant physregs is ok. + if (!MRI->isConstantPhysReg(*AI, *MBB->getParent())) + PhysRefs.insert(*AI); + } if (MO.isDef()) PhysDefs.push_back(Reg); } |