Create specialized code stubs for PixelArray loads.

src/ia32/macro-assembler-ia32.h

 // 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 240 matching lines @@
   }
 
   // Modifies the register even if it does not contain a Smi!
   void SmiUntag(Register reg, Label* is_smi) {
     ASSERT(kSmiTagSize == 1);
     sar(reg, kSmiTagSize);
     ASSERT(kSmiTag == 0);
     j(not_carry, is_smi);
   }
 
+  // Jump the register contains a smi.
+  inline void JumpIfSmi(Register value, Label* smi_label) {
+    test(value, Immediate(kSmiTagMask));
+    j(zero, smi_label, not_taken);
+  }
+  // Jump if register contain a non-smi.
+  inline void JumpIfNotSmi(Register value, Label* not_smi_label) {
+    test(value, Immediate(kSmiTagMask));
+    j(not_zero, not_smi_label, not_taken);
+  }
+
   // Assumes input is a heap object.
   void JumpIfNotNumber(Register reg, TypeInfo info, Label* on_not_number);
 
   // Assumes input is a heap number.  Jumps on things out of range.  Also jumps
   // on the min negative int32.  Ignores frational parts.
   void ConvertToInt32(Register dst,
                       Register src,      // Can be the same as dst.
                       Register scratch,  // Can be no_reg or dst, but not src.
                       TypeInfo info,
                       Label* on_not_int32);
@@ skipping 485 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_MACRO_ASSEMBLER_IA32_H_