Make APFloat constructor require explicit semantics.

Previously we tried to infer it from the bit width size, with an added
IsIEEE argument for the PPC/IEEE 128-bit case, which had a default
value. This default value allowed bugs to creep in, where it was
inappropriate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173138 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 13 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp b/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
index 18748f5d17..5da6d29aab 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
@@ -2767,17 +2767,6 @@ SDValue DAGTypeLegalizer::ExpandIntOp_TRUNCATE(SDNode *N) {
   return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), N->getValueType(0), InL);
 }
 
-static const fltSemantics *EVTToAPFloatSemantics(EVT VT) {
-  switch (VT.getSimpleVT().SimpleTy) {
-  default: llvm_unreachable("Unknown FP format");
-  case MVT::f32:     return &APFloat::IEEEsingle;
-  case MVT::f64:     return &APFloat::IEEEdouble;
-  case MVT::f80:     return &APFloat::x87DoubleExtended;
-  case MVT::f128:    return &APFloat::IEEEquad;
-  case MVT::ppcf128: return &APFloat::PPCDoubleDouble;
-  }
-}
-
 SDValue DAGTypeLegalizer::ExpandIntOp_UINT_TO_FP(SDNode *N) {
   SDValue Op = N->getOperand(0);
   EVT SrcVT = Op.getValueType();
@@ -2787,8 +2776,8 @@ SDValue DAGTypeLegalizer::ExpandIntOp_UINT_TO_FP(SDNode *N) {
   // The following optimization is valid only if every value in SrcVT (when
   // treated as signed) is representable in DstVT.  Check that the mantissa
   // size of DstVT is >= than the number of bits in SrcVT -1.
-  const fltSemantics *sem = EVTToAPFloatSemantics(DstVT);
-  if (APFloat::semanticsPrecision(*sem) >= SrcVT.getSizeInBits()-1 &&
+  const fltSemantics &sem = DAG.EVTToAPFloatSemantics(DstVT);
+  if (APFloat::semanticsPrecision(sem) >= SrcVT.getSizeInBits()-1 &&
       TLI.getOperationAction(ISD::SINT_TO_FP, SrcVT) == TargetLowering::Custom){
     // Do a signed conversion then adjust the result.
     SDValue SignedConv = DAG.getNode(ISD::SINT_TO_FP, dl, DstVT, Op);