[llvm-commits] CVS: llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

[Chris Lattner]

Changes in directory llvm/lib/CodeGen/SelectionDAG:

LegalizeDAG.cpp updated: 1.295 -> 1.296
---
Log message:

don't insert an and node if it isn't needed here, this can prevent folding
of lowered target nodes.


---
Diffs of the changes:  (+3 -1)

 LegalizeDAG.cpp |    4 +++-
 1 files changed, 3 insertions(+), 1 deletion(-)


Index: llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.295 llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.296
--- llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.295	Sun Jan 29 15:02:23 2006
+++ llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp	Sun Jan 29 22:22:28 2006
@@ -1284,7 +1284,9 @@
       } else {
         // Make sure the condition is either zero or one.  It may have been
         // promoted from something else.
-        Tmp1 = DAG.getZeroExtendInReg(Tmp1, MVT::i1);
+        unsigned NumBits = MVT::getSizeInBits(Tmp1.getValueType());
+        if (!TLI.MaskedValueIsZero(Tmp1, (~0ULL >> (64-NumBits))^1))
+          Tmp1 = DAG.getZeroExtendInReg(Tmp1, MVT::i1);
         Result = DAG.getSelectCC(Tmp1, 
                                  DAG.getConstant(0, Tmp1.getValueType()),
                                  Tmp2, Tmp3, ISD::SETNE);