Emit VMLS for multiply-subtract on ARM.

src/arm/lithium-codegen-arm.cc

 // 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 1460 matching lines @@
   DwVfpRegister multiplier = ToDoubleRegister(instr->multiplier());
   DwVfpRegister multiplicand = ToDoubleRegister(instr->multiplicand());
 
   // This is computed in-place.
   ASSERT(addend.is(ToDoubleRegister(instr->result())));
 
   __ vmla(addend, multiplier, multiplicand);
 }
 
 
+void LCodeGen::DoMultiplySubD(LMultiplySubD* instr) {
+  DwVfpRegister minuend = ToDoubleRegister(instr->minuend());
+  DwVfpRegister multiplier = ToDoubleRegister(instr->multiplier());
+  DwVfpRegister multiplicand = ToDoubleRegister(instr->multiplicand());
+
+  // This is computed in-place.
+  ASSERT(minuend.is(ToDoubleRegister(instr->result())));
+
+  __ vmls(minuend, multiplier, multiplicand);
+}
+
+
 void LCodeGen::DoMathFloorOfDiv(LMathFloorOfDiv* instr) {
   const Register result = ToRegister(instr->result());
   const Register left = ToRegister(instr->left());
   const Register remainder = ToRegister(instr->temp());
   const Register scratch = scratch0();
 
   if (!CpuFeatures::IsSupported(SUDIV)) {
     // If the CPU doesn't support sdiv instruction, we only optimize when we
     // have magic numbers for the divisor. The standard integer division routine
     // is usually slower than transitionning to VFP.
@@ skipping 4839 matching lines @@
   __ sub(scratch, result, Operand(index, LSL, kPointerSizeLog2 - kSmiTagSize));
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal