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| author | Chris Lattner <sabre@nondot.org> | 2005-05-09 22:17:13 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-05-09 22:17:13 +0000 |
| commit | 2d8b55c4769d905f588d9eb95e66674e7bdbb3db (patch) | |
| tree | 09c6c1f097ee27c3d422439d00e3486854609de3 /llvm/lib/CodeGen/SelectionDAG | |
| parent | 763a9e8c9b04d1f962469096d1af3131b008855a (diff) | |
| download | bcm5719-llvm-2d8b55c4769d905f588d9eb95e66674e7bdbb3db.tar.gz bcm5719-llvm-2d8b55c4769d905f588d9eb95e66674e7bdbb3db.zip | |
The semantics of cast X to bool are a comparison against zero, not a truncation!
llvm-svn: 21833
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index 8dbf78c270e..d6ec50ae166 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -493,6 +493,11 @@ void SelectionDAGLowering::visitCast(User &I) { 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? |
