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| author | Chris Lattner <sabre@nondot.org> | 2009-07-07 23:28:46 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2009-07-07 23:28:46 +0000 |
| commit | a4f73182450ad6d7197c9229f6396f2e54faefdf (patch) | |
| tree | 1fa224f3ec6a902279333805f2d30803effb31dc /lib | |
| parent | 9fcff043feeb1aad86652f23d830fba9d116141e (diff) | |
| download | external_llvm-a4f73182450ad6d7197c9229f6396f2e54faefdf.zip external_llvm-a4f73182450ad6d7197c9229f6396f2e54faefdf.tar.gz external_llvm-a4f73182450ad6d7197c9229f6396f2e54faefdf.tar.bz2 | |
SelectionDAG::SignBitIsZero doesn't work right for vectors,
for now, conservatively return false.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74969 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 5f45c98..c46eee8 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -1516,6 +1516,10 @@ SDValue SelectionDAG::FoldSetCC(MVT VT, SDValue N1, /// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We /// use this predicate to simplify operations downstream. bool SelectionDAG::SignBitIsZero(SDValue Op, unsigned Depth) const { + // This predicate is not safe for vector operations. + if (Op.getValueType().isVector()) + return false; + unsigned BitWidth = Op.getValueSizeInBits(); return MaskedValueIsZero(Op, APInt::getSignBit(BitWidth), Depth); } |