WebKit merge 41447:41498 [third_party/WebKit]

third_party/WebKit/JavaScriptCore/jit/JIT.cpp

Index: third_party/WebKit/JavaScriptCore/jit/JIT.cpp
===================================================================
--- third_party/WebKit/JavaScriptCore/jit/JIT.cpp	(revision 11154)
+++ third_party/WebKit/JavaScriptCore/jit/JIT.cpp	(working copy)
@@ -304,8 +304,17 @@
 
         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: {