Avoid memmove when emitting operands in the assembler ...

src/assembler-ia32-inl.h

 // Copyright (c) 1994-2006 Sun Microsystems 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:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 252 matching lines @@
 }
 
 
 void Assembler::emit_disp(Label* L, Displacement::Type type) {
   Displacement disp(L, type);
   L->link_to(pc_offset());
   emit(static_cast<int>(disp.data()));
 }
 
 
-void Operand::set_modrm(int mod,  // reg == 0
-                        Register rm) {
+void Operand::set_modrm(int mod, Register rm) {
   ASSERT((mod & -4) == 0);
   buf_[0] = mod << 6 | rm.code();
   len_ = 1;
 }
 
 
 void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) {
   ASSERT(len_ == 1 || len_ == 2);
   *reinterpret_cast<int32_t*>(&buf_[len_]) = disp;
   len_ += sizeof(int32_t);
   rmode_ = rmode;
 }
 
 Operand::Operand(Register reg) {
   // reg
   set_modrm(3, reg);
 }
 
 
 Operand::Operand(int32_t disp, RelocInfo::Mode rmode) {
   // [disp/r]
   set_modrm(0, ebp);
   set_dispr(disp, rmode);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_IA32_INL_H_