[llvm-commits] [llvm] r68889 - /llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp

[Chris Lattner]

Author: lattner
Date: Sun Apr 12 02:46:30 2009
New Revision: 68889

URL: http://llvm.org/viewvc/llvm-project?rev=68889&view=rev
Log:
make UpdateValueMap handle the possiblity that we could be
copying into the right register, avoiding a copy.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp?rev=68889&r1=68888&r2=68889&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp Sun Apr 12 02:46:30 2009
@@ -158,7 +158,7 @@
   unsigned &AssignedReg = ValueMap[I];
   if (AssignedReg == 0)
     AssignedReg = Reg;
-  else {
+  else if (Reg != AssignedReg) {
     const TargetRegisterClass *RegClass = MRI.getRegClass(Reg);
     TII.copyRegToReg(*MBB, MBB->end(), AssignedReg,
                      Reg, RegClass, RegClass);