diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp index 701e5282890..a7070f1b26d 100644 --- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp @@ -158,8 +158,6 @@ SelectionDAGLegalize::SelectionDAGLegalize(SelectionDAG &dag) /// legal for the target. SDOperand SelectionDAGLegalize::ExpandLegalUINT_TO_FP(SDOperand Op0, MVT::ValueType DestVT) { - assert(Op0.getValueType() == MVT::i32 && - "This code only works for i32 input: extend in the future"); SDOperand Tmp1 = DAG.getNode(ISD::SINT_TO_FP, DestVT, Op0); SDOperand SignSet = DAG.getSetCC(ISD::SETLT, TLI.getSetCCResultTy(), @@ -170,7 +168,17 @@ SDOperand SelectionDAGLegalize::ExpandLegalUINT_TO_FP(SDOperand Op0, SDOperand CstOffset = DAG.getNode(ISD::SELECT, Zero.getValueType(), SignSet, Four, Zero); - uint64_t FF = 0x5f800000ULL; + // If the sign bit of the integer is set, the large number will be treated as + // a negative number. To counteract this, the dynamic code adds an offset + // depending on the data type. + uint64_t FF; + switch (Op0.getValueType()) { + default: assert(0 && "Unsupported integer type!"); + case MVT::i8 : FF = 0x43800000ULL; break; // 2^8 (as a float) + case MVT::i16: FF = 0x47800000ULL; break; // 2^16 (as a float) + case MVT::i32: FF = 0x4F800000ULL; break; // 2^32 (as a float) + case MVT::i64: FF = 0x5F800000ULL; break; // 2^64 (as a float) + } if (TLI.isLittleEndian()) FF <<= 32; static Constant *FudgeFactor = ConstantUInt::get(Type::ULongTy, FF); |
