Emit VMLA for multiply-add on ARM

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index d11835452c72d7024f2a38bb49a854eba7ce45f1..fb39c43c6bf034b1c4ed60036ef2f5e20949d368 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -143,6 +143,7 @@ class LChunkBuilder;
   V(MathMinMax)                                \
   V(Mod)                                       \
   V(Mul)                                       \
+  V(MultiplyAddD)                              \
   V(ObjectLiteral)                             \
   V(OsrEntry)                                  \
   V(OuterContext)                              \
@@ -3537,6 +3538,33 @@ class HMul: public HArithmeticBinaryOperation {
 };
 
 
+class HMultiplyAddD: public HTemplateInstruction<4> {
+ public:
+  HMultiplyAddD(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);
+
+    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 void PrintDataTo(StringStream* stream);
+
+  virtual Representation RequiredInputRepresentation(int index) {
+    return index == 0 ? Representation::Tagged() : Representation::Double();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(MultiplyAddD)
+};
+
+
 class HMod: public HArithmeticBinaryOperation {
  public:
   HMod(HValue* context, HValue* left, HValue* right)