[X86] Cleanup the code in LowerFABSorFNEG and LowerFCOPYSIGN a little. NFC

Use SelectionDAG::EVTToAPFloatSemantics. Make the LogicVT calculation in LowerFABSorFNEG similar to LowerFCOPYSIGN. Use APInt::getSignedMaxValue instead of ~APInt::getSignMask.

llvm-svn: 345565

1 files changed, 20 insertions, 30 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 94f3d8c6026..c7d398873d2 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -17956,43 +17956,36 @@ static SDValue LowerFABSorFNEG(SDValue Op, SelectionDAG &DAG) {
   MVT VT = Op.getSimpleValueType();
 
   bool IsF128 = (VT == MVT::f128);
+  assert((VT == MVT::f64 || VT == MVT::f32 || VT == MVT::f128 ||
+          VT == MVT::v2f64 || VT == MVT::v4f64 || VT == MVT::v4f32 ||
+          VT == MVT::v8f32 || VT == MVT::v8f64 || VT == MVT::v16f32) &&
+         "Unexpected type in LowerFABSorFNEG");
 
   // FIXME: Use function attribute "OptimizeForSize" and/or CodeGenOpt::Level to
   // decide if we should generate a 16-byte constant mask when we only need 4 or
   // 8 bytes for the scalar case.
 
-  MVT LogicVT;
-  MVT EltVT;
-
-  if (VT.isVector()) {
-    LogicVT = VT;
-    EltVT = VT.getVectorElementType();
-  } else if (IsF128) {
-    // SSE instructions are used for optimized f128 logical operations.
-    LogicVT = MVT::f128;
-    EltVT = VT;
-  } else {
-    // There are no scalar bitwise logical SSE/AVX instructions, so we
-    // generate a 16-byte vector constant and logic op even for the scalar case.
-    // Using a 16-byte mask allows folding the load of the mask with
-    // the logic op, so it can save (~4 bytes) on code size.
+  // There are no scalar bitwise logical SSE/AVX instructions, so we
+  // generate a 16-byte vector constant and logic op even for the scalar case.
+  // Using a 16-byte mask allows folding the load of the mask with
+  // the logic op, so it can save (~4 bytes) on code size.
+  bool IsFakeVector = !VT.isVector() && !IsF128;
+  MVT LogicVT = VT;
+  if (IsFakeVector)
     LogicVT = (VT == MVT::f64) ? MVT::v2f64 : MVT::v4f32;
-    EltVT = VT;
-  }
 
-  unsigned EltBits = EltVT.getSizeInBits();
+  unsigned EltBits = VT.getScalarSizeInBits();
   // For FABS, mask is 0x7f...; for FNEG, mask is 0x80...
-  APInt MaskElt =
-    IsFABS ? APInt::getSignedMaxValue(EltBits) : APInt::getSignMask(EltBits);
-  const fltSemantics &Sem =
-      EltVT == MVT::f64 ? APFloat::IEEEdouble() :
-          (IsF128 ? APFloat::IEEEquad() : APFloat::IEEEsingle());
+  APInt MaskElt = IsFABS ? APInt::getSignedMaxValue(EltBits) :
+                           APInt::getSignMask(EltBits);
+  const fltSemantics &Sem = SelectionDAG::EVTToAPFloatSemantics(VT);
   SDValue Mask = DAG.getConstantFP(APFloat(Sem, MaskElt), dl, LogicVT);
 
   SDValue Op0 = Op.getOperand(0);
   bool IsFNABS = !IsFABS && (Op0.getOpcode() == ISD::FABS);
-  unsigned LogicOp =
-    IsFABS ? X86ISD::FAND : IsFNABS ? X86ISD::FOR : X86ISD::FXOR;
+  unsigned LogicOp = IsFABS  ? X86ISD::FAND :
+                     IsFNABS ? X86ISD::FOR  :
+                               X86ISD::FXOR;
   SDValue Operand = IsFNABS ? Op0.getOperand(0) : Op0;
 
   if (VT.isVector() || IsF128)
@@ -18028,10 +18021,7 @@ static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
           VT == MVT::v8f32 || VT == MVT::v8f64 || VT == MVT::v16f32) &&
          "Unexpected type in LowerFCOPYSIGN");
 
-  MVT EltVT = VT.getScalarType();
-  const fltSemantics &Sem =
-      EltVT == MVT::f64 ? APFloat::IEEEdouble()
-                        : (IsF128 ? APFloat::IEEEquad() : APFloat::IEEEsingle());
+  const fltSemantics &Sem = SelectionDAG::EVTToAPFloatSemantics(VT);
 
   // Perform all scalar logic operations as 16-byte vectors because there are no
   // scalar FP logic instructions in SSE.
@@ -18048,7 +18038,7 @@ static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
   SDValue SignMask = DAG.getConstantFP(
       APFloat(Sem, APInt::getSignMask(EltSizeInBits)), dl, LogicVT);
   SDValue MagMask = DAG.getConstantFP(
-      APFloat(Sem, ~APInt::getSignMask(EltSizeInBits)), dl, LogicVT);
+      APFloat(Sem, APInt::getSignedMaxValue(EltSizeInBits)), dl, LogicVT);
 
   // First, clear all bits but the sign bit from the second operand (sign).
   if (IsFakeVector)