Create specialized code stubs for PixelArray loads.

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index 6de9a410d13deb15902d7f26823c10fe987e64c0..1d2e68c599ca05f693f0a3ca7cad5cb06267d472 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -3155,6 +3155,43 @@ MaybeObject* KeyedLoadStubCompiler::CompileLoadSpecialized(JSObject* receiver) {
 }
 
 
+MaybeObject* KeyedLoadStubCompiler::CompileLoadPixelArray(JSObject* receiver) {
+  // ----------- S t a t e -------------
+  //  -- eax    : key
+  //  -- edx    : receiver
+  //  -- esp[0] : return address
+  // -----------------------------------
+  Label miss;
+
+  // Check that the receiver isn't a smi.
+  __ test(edx, Immediate(kSmiTagMask));
+  __ j(zero, &miss, not_taken);
+
+  // Check that the map matches.
+  __ cmp(FieldOperand(edx, HeapObject::kMapOffset),

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

CheckMap? I believe CheckMap can check for smi as well.

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

Done.

+         Immediate(Handle<Map>(receiver->map())));
+  __ j(not_equal, &miss, not_taken);
+
+  GenerateFastPixelArrayLoad(masm(),
+                             edx,
+                             eax,
+                             ecx,
+                             ebx,
+                             eax,
+                             &miss,
+                             &miss,
+                             &miss);
+
+  // Handle load cache miss.
+  __ bind(&miss);
+  Handle<Code> ic(Builtins::builtin(Builtins::KeyedLoadIC_Miss));
+  __ jmp(ic, RelocInfo::CODE_TARGET);
+
+  // 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) {