Create specialized code stubs for PixelArray loads.

src/arm/stub-cache-arm.cc

 // Copyright 2006-2009 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 3069 matching lines @@
   __ Ret();
 
   __ 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 -------------
+  //  -- lr    : return address
+  //  -- r0    : key
+  //  -- r1    : receiver
+  // -----------------------------------
+  Label miss;
+
+  // Check that the receiver isn't a smi.
+  __ tst(r1, Operand(kSmiTagMask));

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

JumpIfSmi?

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

Done.

+  __ b(eq, &miss);
+
+  // Check that the map matches.
+  __ ldr(r2, FieldMemOperand(r1, HeapObject::kMapOffset));

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

CheckMap? I think you can even have check map include both the smi and the map
check.

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

Done.

+  __ cmp(r2, Operand(Handle<Map>(receiver->map())));
+  __ b(ne, &miss);
+
+  GenerateFastPixelArrayLoad(masm(),
+                             r1,
+                             r0,
+                             r2,
+                             r3,
+                             r4,
+                             r5,
+                             r0,
+                             &miss,
+                             &miss,
+                             &miss);
+
+  __ bind(&miss);
+  Handle<Code> ic(Builtins::builtin(Builtins::KeyedLoadIC_Miss));
+  __ Jump(ic, RelocInfo::CODE_TARGET);
+
+  // Return the generated code.
+  return GetCode(NORMAL, NULL);
+}
+
+
 MaybeObject* KeyedStoreStubCompiler::CompileStoreField(JSObject* object,
                                                        int index,
                                                        Map* transition,
                                                        String* name) {
   // ----------- S t a t e -------------
   //  -- r0    : value
   //  -- r1    : name
   //  -- r2    : receiver
   //  -- lr    : return address
   // -----------------------------------
@@ skipping 834 matching lines @@
 
   return GetCode(flags);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM