[llvm-commits] [llvm] r103850 - /llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp

[Evan Cheng]

Author: evancheng
Date: Fri May 14 20:35:44 2010
New Revision: 103850

URL: http://llvm.org/viewvc/llvm-project?rev=103850&view=rev
Log:
A partial re-def instruction may be a copy.

Modified:
    llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp

Modified: llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp?rev=103850&r1=103849&r2=103850&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp Fri May 14 20:35:44 2010
@@ -454,7 +454,14 @@
 
       // Value#0 is now defined by the 2-addr instruction.
       OldValNo->def  = RedefIndex;
-      OldValNo->setCopy(0);
+      if (!PartReDef)
+        OldValNo->setCopy(0);
+      else {
+        // A re-def may be a copy. e.g. %reg1030:6<def> = VMOVD %reg1026, ...
+        unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
+        if (tii_->isMoveInstr(*mi, SrcReg, DstReg, SrcSubReg, DstSubReg))
+          OldValNo->setCopy(&*mi);
+      }
       
       // Add the new live interval which replaces the range for the input copy.
       LiveRange LR(DefIndex, RedefIndex, ValNo);