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This option serves as a workaround for processors, which fail on lock prefix. gas/ * config/tc-i386.c (omit_lock_prefix): New. (output_insn): Omit lock prefix if omit_lock_prefix is true. (OPTION_omit_lock_prefix): New. (md_longopts): Add momit-lock-prefix. (md_parse_option): Handle momit-lock-prefix. (md_show_usage): Add momit-lock-prefix=[no|yes]. * doc/c-i386.texi (momit-lock-prefix): Document. gas/testsuite/ * gas/i386/i386.exp: Run new tests. * gas/i386/omit-lock-no.d: New. * gas/i386/omit-lock-yes.d: Ditto. * gas/i386/omit-lock.s: Ditto.