Create specialized code stubs for PixelArray loads.

src/arm/stub-cache-arm.cc

Index: src/arm/stub-cache-arm.cc
diff --git a/src/arm/stub-cache-arm.cc b/src/arm/stub-cache-arm.cc
index 1e99e606942b715942406a8307980e6470555815..cf2a1ef6de78f3aaa6f2a4e98c8aed3b68f9aeae 100644
--- a/src/arm/stub-cache-arm.cc
+++ b/src/arm/stub-cache-arm.cc
@@ -3087,6 +3087,44 @@ MaybeObject* KeyedLoadStubCompiler::CompileLoadSpecialized(JSObject* receiver) {
 }
 
 
+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,