diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 52806235fd2..d11ce804244 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -2535,7 +2535,11 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT) { SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue Operand) { - // Constant fold unary operations with an integer constant operand. + // Constant fold unary operations with an integer constant operand. Even + // opaque constant will be folded, because the folding of unary operations + // doesn't create new constants with different values. Nevertheless, the + // opaque flag is preserved during folding to prevent future folding with + // other constants. if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.getNode())) { const APInt &Val = C->getAPIntValue(); switch (Opcode) { |
