Emit VMLA for multiply-add on ARM

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 125 matching lines @@
   V(LoadKeyed)                                 \
   V(LoadKeyedGeneric)                          \
   V(LoadNamedField)                            \
   V(LoadNamedFieldPolymorphic)                 \
   V(LoadNamedGeneric)                          \
   V(MapEnumLength)                             \
   V(MathFloorOfDiv)                            \
   V(MathMinMax)                                \
   V(Mod)                                       \
   V(Mul)                                       \
+  V(MultiplyAdd)                               \
   V(ObjectLiteral)                             \
   V(OsrEntry)                                  \
   V(OuterContext)                              \
   V(Parameter)                                 \
   V(Power)                                     \
   V(PushArgument)                              \
   V(Random)                                    \
   V(RegExpLiteral)                             \
   V(Return)                                    \
   V(Ror)                                       \
@@ skipping 3374 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(Mul)
 
  protected:
   virtual bool DataEquals(HValue* other) { return true; }
 
   virtual Range* InferRange(Zone* zone);
 };
 
 
+class HMultiplyAdd: public HTemplateInstruction<4> {
+ public:
+  HMultiplyAdd(HValue* context, HValue* a, HValue* b, HValue* c) {
+    ASSERT(a != NULL && b != NULL && c != NULL);
+    SetOperandAt(0, context);
+    SetOperandAt(1, a);
+    SetOperandAt(2, b);
+    SetOperandAt(3, c);
+
+    // FIXME: Not sure what the stuff below means. Stolen from
+    // HArithmeticBinaryOperation and HMathFloorOfDiv.

[ulan_google, 2012/11/07 09:54:03]

It sets the output representation of this instruction.

+    set_representation(Representation::Double());
+  }
+
+  HValue* context() { return OperandAt(0); }
+  HValue* a() { return OperandAt(1); }
+  HValue* b() { return OperandAt(2); }
+  HValue* c() { return OperandAt(3); }
+
+  virtual bool IsCommutative() const { return false; }
+
+  virtual void PrintDataTo(StringStream* stream) {
+    // FIXME: Implement properly in the .cc file
+    a()->PrintNameTo(stream);
+    stream->Add(" ");
+    b()->PrintNameTo(stream);
+    stream->Add(" ");
+    c()->PrintNameTo(stream);
+  }
+
+  virtual Representation RequiredInputRepresentation(int index) {
+    return index == 0 ? Representation::Tagged() : Representation::Double();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(MultiplyAdd)
+};
+
+
 class HMod: public HArithmeticBinaryOperation {
  public:
   HMod(HValue* context, HValue* left, HValue* right)
       : HArithmeticBinaryOperation(context, left, right) {
     SetFlag(kCanBeDivByZero);
   }
 
   bool HasPowerOf2Divisor() {
     if (right()->IsConstant() &&
         HConstant::cast(right())->HasInteger32Value()) {
@@ skipping 1732 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_