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

[Chris Lattner]

Changes in directory llvm/lib/CodeGen/SelectionDAG:

SelectionDAGISel.cpp updated: 1.50 -> 1.51
---
Log message:

The semantics of cast X to bool are a comparison against zero, not a truncation!


---
Diffs of the changes:  (+5 -0)

 SelectionDAGISel.cpp |    5 +++++
 1 files changed, 5 insertions(+)


Index: llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1.50 llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1.51
--- llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1.50	Mon May  9 15:22:36 2005
+++ llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp	Mon May  9 17:17:13 2005
@@ -493,6 +493,11 @@
 
   if (N.getValueType() == DestTy) {
     setValue(&I, N);  // noop cast.
+  } else if (DestTy == MVT::i1) {
+    // Cast to bool is a comparison against zero, not truncation to zero.
+    SDOperand Zero = isInteger(SrcTy) ? DAG.getConstant(0, N.getValueType()) :
+                                       DAG.getConstantFP(0.0, N.getValueType());
+    setValue(&I, DAG.getSetCC(ISD::SETNE, MVT::i1, N, Zero));
   } else if (isInteger(SrcTy)) {
     if (isInteger(DestTy)) {        // Int -> Int cast
       if (DestTy < SrcTy)   // Truncating cast?