Emit VMLA for multiply-add on ARM

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 4596aca2f7628e78bdd4bcc0d84bd5129abd348a..d4f88e80a2db20aca2bbbf2977aa398a396992f3 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -1148,6 +1148,19 @@ void LCodeGen::DoMulI(LMulI* instr) {
 }
 
 
+void LCodeGen::DoMultiplyAddD(LMultiplyAddD* instr) {
+  XMMRegister a = ToDoubleRegister(instr->a());
+  XMMRegister b = ToDoubleRegister(instr->b());
+  XMMRegister c = ToDoubleRegister(instr->c());
+
+  // This is computed in-place.
+  ASSERT(a.is(ToDoubleRegister(instr->result())));
+
+  __ mulsd(a, b);
+  __ addsd(a, c);
+}
+
+
 void LCodeGen::DoBitI(LBitI* instr) {
   LOperand* left = instr->left();
   LOperand* right = instr->right();