https://sourceware.org/bugzilla/show_bug.cgi?id=19661

--- Comment #2 from njholcomb at wi dot rr.com ---
Created attachment 9202
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9202&action=edit
File displays locking without a memory operand.

objdump -d lock_no_mem.o

lock_no_mem.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <main>:
   0:   55                      push   %rbp
   1:   48 89 e5                mov    %rsp,%rbp
   4:   f0 b7 9f                lock mov $0x9f,%bh
   7:   96                      xchg   %eax,%esi
   8:   00 00                   add    %al,(%rax)
   a:   00 b8 00 00 00 00       add    %bh,0x0(%rax)
  10:   5d                      pop    %rbp
  11:   c3                      retq

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