Add cmpxchg and lock instructions to x64 and ia32 {dis,}assemblers

test/cctest/test-disasm-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 727 matching lines @@
       __ shrxl(rax, Operand(rbx, rcx, times_4, 10000), rbx);
       __ rorxq(rax, rbx, 63);
       __ rorxq(rax, Operand(rbx, rcx, times_4, 10000), 63);
       __ rorxl(rax, rbx, 31);
       __ rorxl(rax, Operand(rbx, rcx, times_4, 10000), 31);
     }
   }
 
   // xchg.
   {
+    __ xchgb(rax, Operand(rax, 8));
+    __ xchgw(rax, Operand(rbx, 8));
     __ xchgq(rax, rax);
     __ xchgq(rax, rbx);
     __ xchgq(rbx, rbx);
     __ xchgq(rbx, Operand(rsp, 12));
   }
 
+  // cmpxchg.
+  {
+    __ cmpxchgb(Operand(rsp, 12), rax);
+    __ cmpxchgw(Operand(rbx, rcx, times_4, 10000), rax);
+    __ cmpxchgl(Operand(rbx, rcx, times_4, 10000), rax);
+    __ cmpxchgq(Operand(rbx, rcx, times_4, 10000), rax);
+  }
+
+  // lock prefix.
+  {
+    __ lock();
+    __ cmpxchgl(Operand(rsp, 12), rbx);
+
+    __ lock();
+    __ xchgw(rax, Operand(rcx, 8));
+  }
+
   // Nop instructions
   for (int i = 0; i < 16; i++) {
     __ Nop(i);
   }
 
   __ ret(0);
 
   CodeDesc desc;
   assm.GetCode(&desc);
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
   USE(code);
 #ifdef OBJECT_PRINT
   OFStream os(stdout);
   code->Print(os);
   byte* begin = code->instruction_start();
   byte* end = begin + code->instruction_size();
   disasm::Disassembler::Disassemble(stdout, begin, end);
 #endif
 }
 
 #undef __