Implement crankshaft support for pixel array stores.

src/x64/lithium-codegen-x64.cc

 // Copyright 2011 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 2130 matching lines @@
     }
   }
 }
 
 
 void LCodeGen::DoStoreNamedGeneric(LStoreNamedGeneric* instr) {
   Abort("Unimplemented: %s", "DoStoreNamedGeneric");
 }
 
 
+void LCodeGen::DoStorePixelArrayElement(LStorePixelArrayElement* instr) {
+  Register external_pointer = ToRegister(instr->external_pointer());
+  Register key = ToRegister(instr->key());
+  Register value = ToRegister(instr->value());
+
+  {  // Clamp the value to [0..255].
+    NearLabel done;
+    __ testl(value, Immediate(0xFFFFFF00));
+    __ j(zero, &done);
+    __ setcc(negative, value);  // 1 if negative, 0 if positive.
+    __ decb(value);  // 0 if negative, 255 if positive.
+    __ bind(&done);
+  }
+
+  __ movb(Operand(external_pointer, key, times_1, 0), value);
+}
+
+
 void LCodeGen::DoBoundsCheck(LBoundsCheck* instr) {
   if (instr->length()->IsRegister()) {
     __ cmpq(ToRegister(instr->index()), ToRegister(instr->length()));
   } else {
     __ cmpq(ToRegister(instr->index()), ToOperand(instr->length()));
   }
   DeoptimizeIf(above_equal, instr->environment());
 }
 
 
@@ skipping 593 matching lines @@
   RegisterEnvironmentForDeoptimization(environment);
   ASSERT(osr_pc_offset_ == -1);
   osr_pc_offset_ = masm()->pc_offset();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64