MachineCSE: Hoist isConstantPhysReg out of the loop, it checks for overlaps already.
llvm-svn: 161729
diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp
index 993975e..896461f 100644
--- a/llvm/lib/CodeGen/MachineCSE.cpp
+++ b/llvm/lib/CodeGen/MachineCSE.cpp
@@ -215,11 +215,10 @@
if (MO.isDef() &&
(MO.isDead() || isPhysDefTriviallyDead(Reg, I, MBB->end())))
continue;
- for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI) {
- // Reading constant physregs is ok.
- if (!MRI->isConstantPhysReg(*AI, *MBB->getParent()))
+ // Reading constant physregs is ok.
+ if (!MRI->isConstantPhysReg(Reg, *MBB->getParent()))
+ for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
PhysRefs.insert(*AI);
- }
if (MO.isDef())
PhysDefs.push_back(Reg);
}