MIPS: Turn ToNumberStub into a PlatformCodeStub again.

src/mips64/code-stubs-mips64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 3358 matching lines @@
   // a2: length
   // a3: from index (untagged)
   StringCharAtGenerator generator(v0, a3, a2, v0, &runtime, &runtime, &runtime,
                                   STRING_INDEX_IS_NUMBER, RECEIVER_IS_STRING);
   generator.GenerateFast(masm);
   __ DropAndRet(3);
   generator.SkipSlow(masm, &runtime);
 }
 
 
+void ToNumberStub::Generate(MacroAssembler* masm) {
+  // The ToNumber stub takes one argument in a0.
+  Label check_heap_number, call_builtin;
+  __ JumpIfNotSmi(a0, &check_heap_number);
+  __ Ret(USE_DELAY_SLOT);
+  __ mov(v0, a0);
+
+  __ bind(&check_heap_number);
+  __ ld(a1, FieldMemOperand(a0, HeapObject::kMapOffset));
+  __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
+  __ Branch(&call_builtin, ne, a1, Operand(at));
+  __ Ret(USE_DELAY_SLOT);
+  __ mov(v0, a0);
+
+  __ bind(&call_builtin);
+  __ push(a0);
+  __ InvokeBuiltin(Builtins::TO_NUMBER, JUMP_FUNCTION);
+}
+
+
 void StringHelper::GenerateFlatOneByteStringEquals(
     MacroAssembler* masm, Register left, Register right, Register scratch1,
     Register scratch2, Register scratch3) {
   Register length = scratch1;
 
   // Compare lengths.
   Label strings_not_equal, check_zero_length;
   __ ld(length, FieldMemOperand(left, String::kLengthOffset));
   __ ld(scratch2, FieldMemOperand(right, String::kLengthOffset));
   __ Branch(&check_zero_length, eq, length, Operand(scratch2));
@@ skipping 1573 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS64