[llvm-commits] [llvm] r85638 - /llvm/trunk/lib/CodeGen/SelectionDAG/InstrEmitter.cpp

[Dan Gohman]

Author: djg
Date: Fri Oct 30 18:57:47 2009
New Revision: 85638

URL: http://llvm.org/viewvc/llvm-project?rev=85638&view=rev
Log:
Don't mark registers dead here when processing nodes with MVT::Flag
results. This works around a problem affecting targets which rely on
MVT::Flag to handle physical register defs.

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

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/InstrEmitter.cpp?rev=85638&r1=85637&r2=85638&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/InstrEmitter.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/InstrEmitter.cpp Fri Oct 30 18:57:47 2009
@@ -573,7 +573,11 @@
         unsigned Reg = II.getImplicitDefs()[i - II.getNumDefs()];
         if (Node->hasAnyUseOfValue(i))
           EmitCopyFromReg(Node, i, IsClone, IsCloned, Reg, VRBaseMap);
-        else
+        // If there are no uses, mark the register as dead now, so that
+        // MachineLICM/Sink can see that it's dead. Don't do this if the
+        // node has a Flag value, for the benefit of targets still using
+        // Flag for values in physregs.
+        else if (Node->getValueType(Node->getNumValues()-1) != MVT::Flag)
           MI->addRegisterDead(Reg, TRI);
       }
     }