diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index b92ca2b5aec..7f47853b3fc 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -2096,6 +2096,12 @@ void SelectionDAG::computeKnownBits(SDValue Op, KnownBits &Known, Known.Zero = ~Known.One; return; } + if (auto *C = dyn_cast<ConstantFPSDNode>(Op)) { + // We know all of the bits for a constant fp! + Known.One = C->getValueAPF().bitcastToAPInt(); + Known.Zero = ~Known.One; + return; + } if (Depth == 6) return; // Limit search depth. @@ -2219,10 +2225,11 @@ void SelectionDAG::computeKnownBits(SDValue Op, KnownBits &Known, } case ISD::BITCAST: { SDValue N0 = Op.getOperand(0); - unsigned SubBitWidth = N0.getScalarValueSizeInBits(); + EVT SubVT = N0.getValueType(); + unsigned SubBitWidth = SubVT.getScalarSizeInBits(); - // Ignore bitcasts from floating point. - if (!N0.getValueType().isInteger()) + // Ignore bitcasts from unsupported types. + if (!(SubVT.isInteger() || SubVT.isFloatingPoint())) break; // Fast handling of 'identity' bitcasts. @@ -2960,7 +2967,7 @@ unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, unsigned Depth) const { unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, const APInt &DemandedElts, unsigned Depth) const { EVT VT = Op.getValueType(); - assert(VT.isInteger() && "Invalid VT!"); + assert((VT.isInteger() || VT.isFloatingPoint()) && "Invalid VT!"); unsigned VTBits = VT.getScalarSizeInBits(); unsigned NumElts = DemandedElts.getBitWidth(); unsigned Tmp, Tmp2; @@ -3041,10 +3048,11 @@ unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, const APInt &DemandedElts, case ISD::BITCAST: { SDValue N0 = Op.getOperand(0); - unsigned SrcBits = N0.getScalarValueSizeInBits(); + EVT SrcVT = N0.getValueType(); + unsigned SrcBits = SrcVT.getScalarSizeInBits(); - // Ignore bitcasts from floating point. - if (!N0.getValueType().isInteger()) + // Ignore bitcasts from unsupported types.. + if (!(SrcVT.isInteger() || SrcVT.isFloatingPoint())) break; // Fast handling of 'identity' bitcasts. |
