[Arguments] Port fast arguments creation stubs to X64 and ARM.

src/arm/code-stubs-arm.cc

 // Copyright 2011 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 3920 matching lines @@
   __ Jump(lr);
 
   // Slow-case: Handle non-smi or out-of-bounds access to arguments
   // by calling the runtime system.
   __ bind(&slow);
   __ push(r1);
   __ TailCallRuntime(Runtime::kGetArgumentsProperty, 1, 1);
 }
 
 
-void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
-  UNIMPLEMENTED();
-}
-
-
-void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
-  UNIMPLEMENTED();
-}
-
-
 void ArgumentsAccessStub::GenerateNewNonStrictSlow(MacroAssembler* masm) {
   // sp[0] : number of parameters
   // sp[4] : receiver displacement
   // sp[8] : function
 
   // Check if the calling frame is an arguments adaptor frame.
+  Label runtime;
+  __ ldr(r3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  __ ldr(r2, MemOperand(r3, StandardFrameConstants::kContextOffset));
+  __ cmp(r2, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
+  __ b(ne, &runtime);
+
+  // Patch the arguments.length and the parameters pointer in the current frame.
+  __ ldr(r2, MemOperand(r3, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  __ str(r2, MemOperand(sp, 0 * kPointerSize));
+  __ add(r3, r3, Operand(r2, LSL, 1));

[Alexandre, 2011/06/15 13:27:56]

Here and below, '1' standing for 'kPointerSizeLog2 - kSmiTagSize' in shift
operations. Should we use the verbose description?

+  __ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
+  __ str(r3, MemOperand(sp, 1 * kPointerSize));
+
+  __ bind(&runtime);
+  __ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
+}
+
+
+void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
+  // Stack layout:
+  //  sp[0] : number of parameters (tagged)
+  //  sp[4] : address of receiver argument
+  //  sp[8] : function
+  // Registers used over whole function:
+  //  r6 : allocated object (tagged)
+  //  r9 : mapped parameter count (tagged)
+
+  __ ldr(r1, MemOperand(sp, 0 * kPointerSize));
+  // r1 = parameter count (untagged)

[Kevin Millikin (Chromium), 2011/06/10 11:51:52]

Still says untagged in the change set.

[Karl Klose, 2011/06/14 12:56:28]

Should be done now.

+
+  // Check if the calling frame is an arguments adaptor frame.
+  Label runtime;
+  Label adaptor_frame, try_allocate;
+  __ ldr(r3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  __ ldr(r2, MemOperand(r3, StandardFrameConstants::kContextOffset));
+  __ cmp(r2, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
+  __ b(eq, &adaptor_frame);
+
+  // No adaptor, parameter count = argument count.
+  __ mov(r2, r1);
+  __ b(&try_allocate);
+
+  // We have an adaptor frame. Patch the parameters pointer.
+  __ bind(&adaptor_frame);
+  __ ldr(r2, MemOperand(r3, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  __ add(r3, r3, Operand(r2, LSL, 1));
+  __ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
+  __ str(r3, MemOperand(sp, 1 * kPointerSize));
+
+  // r1 = parameter count (tagged)
+  // r2 = argument count (tagged)
+  // Compute the mapped parameter count = min(r1, r2) in r1.
+  __ cmp(r1, Operand(r2));
+  __ mov(r1, Operand(r2), LeaveCC, gt);
+
+  __ bind(&try_allocate);
+  // Save mapped parameter count.
+  __ mov(r9, r1);

[Kevin Millikin (Chromium), 2011/06/10 11:51:52]

Not a big deal, but you could save the mov(r1, r9) below by using (and
destroying) r9 instead of r1.

[Karl Klose, 2011/06/14 12:56:28]

Done.

+
+  // Compute the sizes of backing store, parameter map, and arguments object.
+  // 1. Parameter map, has 2 extra words containing context and backing store.
+  const int kParameterMapHeaderSize =
+      FixedArray::kHeaderSize + 2 * kPointerSize;
+  // If there are no mapped parameters, we do not need the parameter_map.
+  __ cmp(r1, Operand(Smi::FromInt(0)));
+  __ mov(r1, Operand(r1, LSL, 1), LeaveCC, ne);
+  __ add(r1, r1, Operand(kParameterMapHeaderSize), LeaveCC, ne);
+
+  // 2. Backing store.
+  __ add(r1, r1, Operand(r2, LSL, 1));
+  __ add(r1, r1, Operand(FixedArray::kHeaderSize));

[Alexandre, 2011/06/15 13:27:56]

This add and the following one could be merged into only one instruction.

+
+  // 3. Arguments object.
+  __ add(r1, r1, Operand(Heap::kArgumentsObjectSize));
+
+  // Do the allocation of all three objects in one go.
+  __ AllocateInNewSpace(r1, r0, r3, r4, &runtime, TAG_OBJECT);
+
+  // r0 = address of new object(s) (tagged)
+  // r2 = argument count (tagged)
+  // Get the arguments boilerplate from the current (global) context into r4.
+  const int kNormalOffset =
+      Context::SlotOffset(Context::ARGUMENTS_BOILERPLATE_INDEX);
+  const int kAliasedOffset =
+      Context::SlotOffset(Context::ALIASED_ARGUMENTS_BOILERPLATE_INDEX);
+
+  __ ldr(r4, MemOperand(r8, Context::SlotOffset(Context::GLOBAL_INDEX)));
+  __ ldr(r4, FieldMemOperand(r4, GlobalObject::kGlobalContextOffset));
+  __ mov(r1, r9);
+  __ cmp(r1, Operand(0));

[Kevin Millikin (Chromium), 2011/06/10 11:51:52]

Operand(Smi::FromInt(0))?

+  __ ldr(r4, MemOperand(r4, kNormalOffset), eq);
+  __ ldr(r4, MemOperand(r4, kAliasedOffset), ne);
+
+  // r0 = address of new object (tagged)
+  // r1 = mapped parameter count (tagged)
+  // r2 = argument count (tagged)
+  // r4 = address of boilerplate object (tagged)
+  // Copy the JS object part.
+  for (int i = 0; i < JSObject::kHeaderSize; i += kPointerSize) {
+    __ ldr(r3, FieldMemOperand(r4, i));
+    __ str(r3, FieldMemOperand(r0, i));
+  }
+
+  // Setup the callee in-object property.
+  STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
+  __ ldr(r3, MemOperand(sp, 2 * kPointerSize));
+  const int kCalleeOffset = JSObject::kHeaderSize +
+      Heap::kArgumentsCalleeIndex * kPointerSize;
+  __ str(r3, FieldMemOperand(r0, kCalleeOffset));
+
+  // Use the length (smi tagged) and set that as an in-object property too.
+  STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
+  const int kLengthOffset = JSObject::kHeaderSize +
+      Heap::kArgumentsLengthIndex * kPointerSize;
+  __ str(r2, FieldMemOperand(r0, kLengthOffset));
+
+  // Setup the elements pointer in the allocated arguments object.
+  // If we allocated a parameter map, r4 will point there, otherwise
+  // it will point to the backing store.
+  __ add(r4, r0, Operand(Heap::kArgumentsObjectSize));
+  __ str(r4, FieldMemOperand(r0, JSObject::kElementsOffset));
+
+  // r0 = address of new object (tagged)
+  // r1 = mapped parameter count (tagged)
+  // r2 = argument count (tagged)
+  // r4 = address of parameter map or backing store (tagged)
+
+  // Initialize parameter map. If there are no mapped arguments, we're done.
+  Label skip_parameter_map;
+  __ cmp(r1, Operand(Smi::FromInt(0)));
+  // Move backing store address to r3, because it is
+  // expected there when filling in the unmapped arguments.
+  __ mov(r3, r4, LeaveCC, eq);
+  __ b(eq, &skip_parameter_map);
+
+  __ LoadRoot(r6, Heap::kNonStrictArgumentsElementsMapRootIndex);
+  __ str(r6, FieldMemOperand(r4, FixedArray::kMapOffset));
+  __ add(r6, r1, Operand(Smi::FromInt(2)));
+  __ str(r6, FieldMemOperand(r4, FixedArray::kLengthOffset));
+  __ str(r8, FieldMemOperand(r4, FixedArray::kHeaderSize + 0 * kPointerSize));
+  __ add(r6, r4, Operand(r1, LSL, 1));
+  __ add(r6, r6, Operand(kParameterMapHeaderSize));
+  __ str(r6, FieldMemOperand(r4, FixedArray::kHeaderSize + 1 * kPointerSize));
+
+  // Copy the parameter slots and the holes in the arguments.
+  // We need to fill in mapped_parameter_count slots. They index the context,
+  // where parameters are stored in reverse order, at
+  //   MIN_CONTEXT_SLOTS .. MIN_CONTEXT_SLOTS+parameter_count-1
+  // The mapped parameter thus need to get indices
+  //   MIN_CONTEXT_SLOTS+parameter_count-1 ..
+  //       MIN_CONTEXT_SLOTS+parameter_count-mapped_parameter_count
+  // We loop from right to left.
+  Label parameters_loop, parameters_test;
+  __ mov(r6, r9);
+  __ ldr(r1, MemOperand(sp, 0 * kPointerSize));
+  __ add(r1, r1, Operand(Smi::FromInt(Context::MIN_CONTEXT_SLOTS)));
+  __ sub(r1, r1, Operand(r6));
+  __ LoadRoot(r7, Heap::kTheHoleValueRootIndex);
+  __ add(r3, r4, Operand(r6, LSL, 1));
+  __ add(r3, r3, Operand(kParameterMapHeaderSize));
+
+  // r6 = loop variable (tagged)
+  // r1 = mapping index (tagged)
+  // r3 = address of backing store (tagged)
+  // r4 = address of parameter map (tagged)
+  // r5 = temporary scratch (a.o., for address calculation)
+  // r7 = the hole value
+  __ jmp(&parameters_test);

[Alexandre, 2011/06/15 13:27:56]

I don't know how performance sensitive this loop is, but I think it could be
optimized to something like this:


Label loop, end;

cmp r6, 0
beq end

// Setup.
// Use r6 as the counter, already shifted to kPointerSize.
mov r6, r6 LSL 1
// Compute base addresses of stores. (extracting loop invariant code)
add r5, r4, kParameterMapHeaderSize - kHeapObjectTag
add r3, r3, FixedArray::kHeaderSize - kHeapObjectTag

bind(loop);
subs r6, r6, kPointerSize   // Decrement the counter and set the flags.
// Stores.
str r1, [r5, r6]
add r1, r1, Smi::FromInt(1)
str r7, [r3, r6]
bgt, loop

// Restore address of backing store.
sub r3, r3, FixedArray::kHeaderSize - kHeapObjectTag

bind(end);

+
+  __ bind(&parameters_loop);
+  __ sub(r6, r6, Operand(Smi::FromInt(1)));
+  __ mov(r5, Operand(r6, LSL, 1));
+  __ add(r5, r5, Operand(kParameterMapHeaderSize - kHeapObjectTag));
+  __ str(r1, MemOperand(r4, r5));
+  __ sub(r5, r5, Operand(kParameterMapHeaderSize - FixedArray::kHeaderSize));
+  __ str(r7, MemOperand(r3, r5));
+  __ add(r1, r1, Operand(Smi::FromInt(1)));
+  __ bind(&parameters_test);
+  __ cmp(r6, Operand(0));
+  __ b(ne, &parameters_loop);
+
+  __ bind(&skip_parameter_map);
+  // r2 = argument count (tagged)
+  // r3 = address of backing store (tagged)
+  // r5 = scratch
+  // Copy arguments header and remaining slots (if there are any).
+  __ LoadRoot(r5, Heap::kFixedArrayMapRootIndex);
+  __ str(r5, FieldMemOperand(r3, FixedArray::kMapOffset));
+  __ str(r2, FieldMemOperand(r3, FixedArray::kLengthOffset));
+
+  Label arguments_loop, arguments_test;
+  __ mov(r1, r9);

[Alexandre, 2011/06/15 13:27:56]

If necessary I think this loop could also be refactored.

- If r4 is not used outside the loop the test to enter the loop can be moved at
the very beginning.
- Using r1 as a counter
    - aligned on kPointerSize (with a 'sub' setting flags)
    - 'r1 LSL 1' shift can be moved to the initial 'mov(r1, r9)'

+  __ ldr(r4, MemOperand(sp, 1 * kPointerSize));
+  __ sub(r4, r4, Operand(r1, LSL, 1));
+  __ jmp(&arguments_test);
+
+  __ bind(&arguments_loop);
+  __ sub(r4, r4, Operand(kPointerSize));

[Alexandre, 2011/06/15 13:27:56]

The sub can be merged with the ldr using NegPreIndex.

+  __ ldr(r6, MemOperand(r4, 0));
+  __ add(r5, r3, Operand(r1, LSL, 1));
+  __ str(r6, FieldMemOperand(r5, FixedArray::kHeaderSize));
+  __ add(r1, r1, Operand(Smi::FromInt(1)));
+
+  __ bind(&arguments_test);
+  __ cmp(r1, Operand(r2));
+  __ b(lt, &arguments_loop);
+
+  // Return and remove the on-stack parameters.
+  __ add(sp, sp, Operand(3 * kPointerSize));
+  __ Ret();
+
+  // Do the runtime call to allocate the arguments object.
+  // r2 = argument count (taggged)
+  __ bind(&runtime);
+  __ str(r2, MemOperand(sp, 0 * kPointerSize));  // Patch argument count.
+  __ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
+}
+
+
+void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
+  // sp[0] : number of parameters
+  // sp[4] : receiver displacement
+  // sp[8] : function
+  // Check if the calling frame is an arguments adaptor frame.
   Label adaptor_frame, try_allocate, runtime;
   __ ldr(r2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   __ ldr(r3, MemOperand(r2, StandardFrameConstants::kContextOffset));
   __ cmp(r3, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
   __ b(eq, &adaptor_frame);
 
   // Get the length from the frame.
   __ ldr(r1, MemOperand(sp, 0));
   __ b(&try_allocate);
 
   // Patch the arguments.length and the parameters pointer.
   __ bind(&adaptor_frame);
   __ ldr(r1, MemOperand(r2, ArgumentsAdaptorFrameConstants::kLengthOffset));
   __ str(r1, MemOperand(sp, 0));
   __ add(r3, r2, Operand(r1, LSL, kPointerSizeLog2 - kSmiTagSize));
   __ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
   __ str(r3, MemOperand(sp, 1 * kPointerSize));
 
   // Try the new space allocation. Start out with computing the size
   // of the arguments object and the elements array in words.
   Label add_arguments_object;
   __ bind(&try_allocate);
-  if (type_ == NEW_NON_STRICT_SLOW || type_ == NEW_NON_STRICT_FAST) {
-    __ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
-  } else {
-    __ cmp(r1, Operand(0, RelocInfo::NONE));
-    __ b(eq, &add_arguments_object);
-    __ mov(r1, Operand(r1, LSR, kSmiTagSize));
-    __ add(r1, r1, Operand(FixedArray::kHeaderSize / kPointerSize));
-    __ bind(&add_arguments_object);
-    __ add(r1, r1, Operand(Heap::kArgumentsObjectSizeStrict / kPointerSize));
+  __ cmp(r1, Operand(0, RelocInfo::NONE));
+  __ b(eq, &add_arguments_object);
+  __ mov(r1, Operand(r1, LSR, kSmiTagSize));
+  __ add(r1, r1, Operand(FixedArray::kHeaderSize / kPointerSize));
+  __ bind(&add_arguments_object);
+  __ add(r1, r1, Operand(Heap::kArgumentsObjectSizeStrict / kPointerSize));
 
-    // Do the allocation of both objects in one go.
-    __ AllocateInNewSpace(
-        r1,
-        r0,
-        r2,
-        r3,
-        &runtime,
-        static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
+  // Do the allocation of both objects in one go.
+  __ AllocateInNewSpace(r1,
+                        r0,
+                        r2,
+                        r3,
+                        &runtime,
+                        static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
 
-    // Get the arguments boilerplate from the current (global) context.
-    __ ldr(r4, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
-    __ ldr(r4, FieldMemOperand(r4, GlobalObject::kGlobalContextOffset));
-    __ ldr(r4, MemOperand(r4, Context::SlotOffset(
-        Context::STRICT_MODE_ARGUMENTS_BOILERPLATE_INDEX)));
+  // Get the arguments boilerplate from the current (global) context.
+  __ ldr(r4, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
+  __ ldr(r4, FieldMemOperand(r4, GlobalObject::kGlobalContextOffset));
+  __ ldr(r4, MemOperand(r4, Context::SlotOffset(
+      Context::STRICT_MODE_ARGUMENTS_BOILERPLATE_INDEX)));
 
-    // Copy the JS object part.
-    __ CopyFields(r0, r4, r3.bit(), JSObject::kHeaderSize / kPointerSize);
+  // Copy the JS object part.
+  __ CopyFields(r0, r4, r3.bit(), JSObject::kHeaderSize / kPointerSize);
 
-    if (type_ == NEW_NON_STRICT_SLOW || type_ == NEW_NON_STRICT_FAST) {
-      // Setup the callee in-object property.
-      STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
-      __ ldr(r3, MemOperand(sp, 2 * kPointerSize));
-      const int kCalleeOffset = JSObject::kHeaderSize +
-          Heap::kArgumentsCalleeIndex * kPointerSize;
-      __ str(r3, FieldMemOperand(r0, kCalleeOffset));
-    }
+  // Get the length (smi tagged) and set that as an in-object property too.
+  STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
+  __ ldr(r1, MemOperand(sp, 0 * kPointerSize));
+  __ str(r1, FieldMemOperand(r0, JSObject::kHeaderSize +
+      Heap::kArgumentsLengthIndex * kPointerSize));
 
-    // Get the length (smi tagged) and set that as an in-object property too.
-    STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
-    __ ldr(r1, MemOperand(sp, 0 * kPointerSize));
-    __ str(r1, FieldMemOperand(r0, JSObject::kHeaderSize +
-                               Heap::kArgumentsLengthIndex * kPointerSize));
+  // If there are no actual arguments, we're done.
+  Label done;
+  __ cmp(r1, Operand(0, RelocInfo::NONE));
+  __ b(eq, &done);
 
-    // If there are no actual arguments, we're done.
-    Label done;
-    __ cmp(r1, Operand(0, RelocInfo::NONE));
-    __ b(eq, &done);
+  // Get the parameters pointer from the stack.
+  __ ldr(r2, MemOperand(sp, 1 * kPointerSize));
 
-    // Get the parameters pointer from the stack.
-    __ ldr(r2, MemOperand(sp, 1 * kPointerSize));
+  // Setup the elements pointer in the allocated arguments object and
+  // initialize the header in the elements fixed array.
+  __ add(r4, r0, Operand(Heap::kArgumentsObjectSizeStrict));
+  __ str(r4, FieldMemOperand(r0, JSObject::kElementsOffset));
+  __ LoadRoot(r3, Heap::kFixedArrayMapRootIndex);
+  __ str(r3, FieldMemOperand(r4, FixedArray::kMapOffset));
+  __ str(r1, FieldMemOperand(r4, FixedArray::kLengthOffset));
+  // Untag the length for the loop.
+  __ mov(r1, Operand(r1, LSR, kSmiTagSize));

[Alexandre, 2011/06/15 13:27:56]

If r1 is only used as a counter and not used later there is no need to untag it.
It can be decremented by Smi::FromInt(1) instead.

 
-    // Setup the elements pointer in the allocated arguments object and
-    // initialize the header in the elements fixed array.
-    __ add(r4, r0, Operand(Heap::kArgumentsObjectSizeStrict));
-    __ str(r4, FieldMemOperand(r0, JSObject::kElementsOffset));
-    __ LoadRoot(r3, Heap::kFixedArrayMapRootIndex);
-    __ str(r3, FieldMemOperand(r4, FixedArray::kMapOffset));
-    __ str(r1, FieldMemOperand(r4, FixedArray::kLengthOffset));
-    // Untag the length for the loop.
-    __ mov(r1, Operand(r1, LSR, kSmiTagSize));
+  // Copy the fixed array slots.
+  Label loop;
+  // Setup r4 to point to the first array slot.
+  __ add(r4, r4, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ bind(&loop);
+  // Pre-decrement r2 with kPointerSize on each iteration.
+  // Pre-decrement in order to skip receiver.
+  __ ldr(r3, MemOperand(r2, kPointerSize, NegPreIndex));
+  // Post-increment r4 with kPointerSize on each iteration.
+  __ str(r3, MemOperand(r4, kPointerSize, PostIndex));
+  __ sub(r1, r1, Operand(1));
+  __ cmp(r1, Operand(0, RelocInfo::NONE));

[Alexandre, 2011/06/15 13:27:56]

Could merge the 'sub' and 'cmp' instructions into a 'subs'.

+  __ b(ne, &loop);
 
-    // Copy the fixed array slots.
-    Label loop;
-    // Setup r4 to point to the first array slot.
-    __ add(r4, r4, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
-    __ bind(&loop);
-    // Pre-decrement r2 with kPointerSize on each iteration.
-    // Pre-decrement in order to skip receiver.
-    __ ldr(r3, MemOperand(r2, kPointerSize, NegPreIndex));
-    // Post-increment r4 with kPointerSize on each iteration.
-    __ str(r3, MemOperand(r4, kPointerSize, PostIndex));
-    __ sub(r1, r1, Operand(1));
-    __ cmp(r1, Operand(0, RelocInfo::NONE));
-    __ b(ne, &loop);
+  // Return and remove the on-stack parameters.
+  __ bind(&done);
+  __ add(sp, sp, Operand(3 * kPointerSize));
+  __ Ret();
 
-    // Return and remove the on-stack parameters.
-    __ bind(&done);
-    __ add(sp, sp, Operand(3 * kPointerSize));
-    __ Ret();
-
-    // Do the runtime call to allocate the arguments object.
-    __ bind(&runtime);
-    __ TailCallRuntime(Runtime::kNewStrictArgumentsFast, 3, 1);
-  }
+  // Do the runtime call to allocate the arguments object.
+  __ bind(&runtime);
+  __ TailCallRuntime(Runtime::kNewStrictArgumentsFast, 3, 1);
 }
 
 
 void RegExpExecStub::Generate(MacroAssembler* masm) {
   // Just jump directly to runtime if native RegExp is not selected at compile
   // time or if regexp entry in generated code is turned off runtime switch or
   // at compilation.
 #ifdef V8_INTERPRETED_REGEXP
   __ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
 #else  // V8_INTERPRETED_REGEXP
@@ skipping 2352 matching lines @@
   __ mov(result, Operand(0));
   __ Ret();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM