commit 5fa2d458af8522a0fc3c6c93227d8cb3c0dc2862
author Benjamin Kramer <benny.kra@googlemail.com> Sat Aug 11 20:42:59 2012 +0000
committer Benjamin Kramer <benny.kra@googlemail.com> Sat Aug 11 20:42:59 2012 +0000
tree aa4d820ef2ffd29a70aa594e33410d9062f293b8
parent cfc0ad6e48fcbb5d9d7d97307e5b5df6bba53a97

MachineCSE: Hoist isConstantPhysReg out of the loop, it checks for overlaps already.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161729 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineCSE.cpp

diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp
index 993975e..896461f 100644
--- a/lib/CodeGen/MachineCSE.cpp
+++ b/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);
   }