diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 4809db4775..60a749df2f 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -1335,6 +1335,14 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); if (N1C) { + if (Opcode == ISD::SIGN_EXTEND_INREG) { + int64_t Val = N1C->getValue(); + unsigned FromBits = MVT::getSizeInBits(cast<VTSDNode>(N2)->getVT()); + Val <<= 64-FromBits; + Val >>= 64-FromBits; + return getConstant(Val, VT); + } + if (N2C) { uint64_t C1 = N1C->getValue(), C2 = N2C->getValue(); switch (Opcode) { @@ -1441,7 +1449,7 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, } } - // Fold a bunch of operators that + // Fold a bunch of operators when the RHS is undef. if (N2.getOpcode() == ISD::UNDEF) { switch (Opcode) { case ISD::ADD: |