WebKit merge 41447:41498 [third_party/WebKit]

third_party/WebKit/JavaScriptCore/jit/JIT.cpp

 /*
  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 286 matching lines @@
 #if ENABLE(OPCODE_SAMPLING)
         if (m_bytecodeIndex > 0) // Avoid the overhead of sampling op_enter twice.
             sampleInstruction(currentInstruction);
 #endif
 
         m_labels[m_bytecodeIndex] = label();
         OpcodeID opcodeID = m_interpreter->getOpcodeID(currentInstruction->u.opcode);
 
         switch (opcodeID) {
         case op_mov: {
-            emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
-            emitPutVirtualRegister(currentInstruction[1].u.operand);
+            int src = currentInstruction[2].u.operand;
+            int dst = currentInstruction[1].u.operand;
+
+            if (m_codeBlock->isConstantRegisterIndex(src)) {
+                storePtr(ImmPtr(JSValuePtr::encode(getConstantOperand(src))), Address(callFrameRegister, dst * sizeof(Register)));
+                if (dst == m_lastResultBytecodeRegister)
+                    killLastResultRegister();
+            } else {
+                emitGetVirtualRegister(src, regT0);
+                emitPutVirtualRegister(dst);
+            }
             NEXT_OPCODE(op_mov);
         }
         case op_add: {
             compileFastArith_op_add(currentInstruction);
             NEXT_OPCODE(op_add);
         }
         case op_end: {
             if (m_codeBlock->needsFullScopeChain())
                 emitCTICall(JITStubs::cti_op_end);
             ASSERT(returnValueRegister != callFrameRegister);
@@ skipping 1597 matching lines @@
     loadPtr(Address(variableObject, FIELD_OFFSET(JSVariableObject, d)), variableObject);
     loadPtr(Address(variableObject, FIELD_OFFSET(JSVariableObject::JSVariableObjectData, registers)), variableObject);
     storePtr(src, Address(variableObject, index * sizeof(Register)));
 }
 
 } // namespace JSC
 
 #endif // ENABLE(JIT)