Emit VMLA for multiply-add on ARM

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
index 0ba5e45a8fe1c67b99c9e197d89c53a088410fc5..678d07740bb0f36099800424eb8e134d3a55a5e8 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -135,6 +135,7 @@ class LCodeGen;
   V(MathMinMax)                                 \
   V(ModI)                                       \
   V(MulI)                                       \
+  V(MultiplyAddD)                               \
   V(NumberTagD)                                 \
   V(NumberTagI)                                 \
   V(NumberTagU)                                 \
@@ -621,6 +622,24 @@ class LMulI: public LTemplateInstruction<1, 2, 1> {
 };
 
 
+// Instruction for computing multiplier * multiplicand + addend.
+class LMultiplyAddD: public LTemplateInstruction<1, 3, 0> {
+ public:
+  LMultiplyAddD(LOperand* addend, LOperand* multiplier,
+                LOperand* multiplicand) {
+    inputs_[0] = addend;
+    inputs_[1] = multiplier;
+    inputs_[2] = multiplicand;
+  }
+
+  LOperand* addend() { return inputs_[0]; }
+  LOperand* multiplier() { return inputs_[1]; }
+  LOperand* multiplicand() { return inputs_[2]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(MultiplyAddD, "multiply-add-d")
+};
+
+
 class LCmpIDAndBranch: public LControlInstruction<2, 0> {
  public:
   LCmpIDAndBranch(LOperand* left, LOperand* right) {
@@ -2396,6 +2415,8 @@ class LChunkBuilder BASE_EMBEDDED {
   HYDROGEN_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 #undef DECLARE_DO
 
+  LInstruction* DoMultiplyAdd(HMul* mul, HValue* addend);
+
   static bool HasMagicNumberForDivisor(int32_t divisor);
   static HValue* SimplifiedDividendForMathFloorOfDiv(HValue* val);
   static HValue* SimplifiedDivisorForMathFloorOfDiv(HValue* val);