Add custom typed ICs for pixel array loads.

src/x64/ic-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 749 matching lines @@
 
   // Perform tail call to the entry.
   __ TailCallExternalReference(ExternalReference(
         IC_Utility(kKeyedLoadPropertyWithInterceptor)), 2, 1);
 
   __ bind(&slow);
   GenerateMiss(masm);
 }
 
 
+void KeyedLoadIC::GeneratePixelArray(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax    : key
+  //  -- rdx    : receiver
+  //  -- rsp[0] : return address
+  // -----------------------------------
+  Label slow;
+
+  // Verify that it's safe to access the receiver's elements.
+  GenerateKeyedLoadReceiverCheck(
+      masm, rdx, rcx, Map::kHasNamedInterceptor, &slow);
+
+  // Verify that the receiver has pixel array elements.
+  __ movq(rcx, FieldOperand(rdx, JSObject::kElementsOffset));
+  __ CompareRoot(FieldOperand(rcx, HeapObject::kMapOffset),
+                 Heap::kPixelArrayMapRootIndex);
+  __ j(not_equal, &slow);
+
+  // Check that the key is a smi and in range.
+  __ JumpIfNotSmi(rax, &slow);
+  __ SmiToInteger32(rbx, rax);
+  __ cmpl(rbx, FieldOperand(rcx, PixelArray::kLengthOffset));
+  __ j(above_equal, &slow);
+
+  // Load and tag the element as a smi.
+  __ movq(rax, FieldOperand(rcx, PixelArray::kExternalPointerOffset));
+  __ movzxbq(rax, Operand(rax, rbx, times_1, 0));
+  __ Integer32ToSmi(rax, rax);
+  __ ret(0);
+
+  __ bind(&slow);
+  GenerateMiss(masm);
+}
+
+
 void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- rax     : value
   //  -- rcx     : key
   //  -- rdx     : receiver
   //  -- rsp[0]  : return address
   // -----------------------------------
   Label slow, slow_with_tagged_index, fast, array, extra, check_pixel_array;
 
   // Check that the object isn't a smi.
@@ skipping 922 matching lines @@
 }
 
 void PatchInlinedSmiCode(Address address) {
   UNIMPLEMENTED();
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64