Create specialized code stubs for PixelArray loads.

src/x64/stub-cache-x64.cc

 // Copyright 2010 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 2980 matching lines @@
   __ ret(0);
 
   __ bind(&miss);
   GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC);
 
   // Return the generated code.
   return GetCode(NORMAL, NULL);
 }
 
 
+MaybeObject* KeyedLoadStubCompiler::CompileLoadPixelArray(JSObject* receiver) {
+  // ----------- S t a t e -------------
+  //  -- rax    : key
+  //  -- rdx    : receiver
+  //  -- esp[0] : return address
+  // -----------------------------------
+  Label miss;
+
+  // Check that the receiver isn't a smi.
+  __ JumpIfSmi(rdx, &miss);
+
+  // Check that the map matches.
+  __ Cmp(FieldOperand(rdx, HeapObject::kMapOffset),

[Mads Ager (chromium), 2011/02/01 12:02:12]

Use CheckMap to check both map and not smi?

[danno, 2011/02/03 12:53:26]

Done.

+         Handle<Map>(receiver->map()));
+  __ j(not_equal, &miss);
+
+  GenerateFastPixelArrayLoad(masm(),
+                             rdx,
+                             rax,
+                             rbx,
+                             rcx,
+                             rax,
+                             &miss,
+                             &miss,
+                             &miss);
+
+  __ bind(&miss);
+  GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC);
+
+  // Return the generated code.
+  return GetCode(NORMAL, NULL);
+}
+
+
 // Specialized stub for constructing objects from functions which only have only
 // simple assignments of the form this.x = ...; in their body.
 MaybeObject* ConstructStubCompiler::CompileConstructStub(JSFunction* function) {
   // ----------- S t a t e -------------
   //  -- rax : argc
   //  -- rdi : constructor
   //  -- rsp[0] : return address
   //  -- rsp[4] : last argument
   // -----------------------------------
   Label generic_stub_call;
@@ skipping 416 matching lines @@
   __ TailCallRuntime(Runtime::kSetProperty, 3, 1);
 
   return GetCode(flags);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64