Fixed bug in x64 port of KeyedStoreIC::GenerateExternalArray where it...

src/x64/ic-x64.cc

 // Copyright 2009 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 772 matching lines @@
   // +/-Infinity into integer arrays basically undefined. For more
   // reproducible behavior, convert these to zero.
   __ fld_d(FieldOperand(rax, HeapNumber::kValueOffset));
   __ movq(rdx, rax);  // Save the value.
   __ movq(rcx, FieldOperand(rcx, ExternalArray::kExternalPointerOffset));
   // rbx: untagged index
   // rcx: base pointer of external storage
   // top of FPU stack: value
   if (array_type == kExternalFloatArray) {
     __ fstp_s(Operand(rcx, rbx, times_4, 0));
+    __ movq(rax, rdx);  // Return the original value.
+    __ ret(0);
   } else {
     // Need to perform float-to-int conversion.
     // Test the top of the FP stack for NaN.
     Label is_nan;
     __ fucomi(0);
     __ j(parity_even, &is_nan);
 
     __ push(rax);  // Make room on stack
     __ fistp_d(Operand(rsp, 0));
     __ pop(rax);
@@ skipping 522 matching lines @@
 
   // Cache miss: Jump to runtime.
   Generate(masm, ExternalReference(IC_Utility(kStoreIC_Miss)));
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal