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| author | Ilya Tocar <ilya.tocar@intel.com> | 2014-08-01 17:58:32 +0400 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2014-08-06 08:32:01 -0700 |
| commit | d022bddd4fd93428a7fa3cc7ad404c912ed20dbf (patch) | |
| tree | 03fca1a622763ceb73b02e5c514be06f46f20681 /gas/doc/c-i386.texi | |
| parent | ad9fe6c108abf73f47219655ff19a5ec68b68124 (diff) | |
| download | gdb-d022bddd4fd93428a7fa3cc7ad404c912ed20dbf.zip gdb-d022bddd4fd93428a7fa3cc7ad404c912ed20dbf.tar.gz gdb-d022bddd4fd93428a7fa3cc7ad404c912ed20dbf.tar.bz2 | |
Add -momit_lock_prefix=[no|yes] option
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.
Diffstat (limited to 'gas/doc/c-i386.texi')
| -rw-r--r-- | gas/doc/c-i386.texi | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi index c1631c2..0c2e134 100644 --- a/gas/doc/c-i386.texi +++ b/gas/doc/c-i386.texi @@ -291,6 +291,18 @@ if such prefix was not explicitly specified in the source code. On x86-64 PE/COFF target this option forces the use of big object file format, which allows more than 32768 sections. +@cindex @samp{-momit-lock-prefix=} option, i386 +@cindex @samp{-momit-lock-prefix=} option, x86-64 +@item -momit-lock-prefix=@var{no} +@itemx -momit-lock-prefix=@var{yes} +These options control how the assembler should encode lock prefix. +This option is intended as a workaround for processors, that fail on +lock prefix. This option can only be safely used with single-core, +single-thread computers +@option{-momit-lock-prefix=@var{yes}} will omit all lock prefixes. +@option{-momit-lock-prefix=@var{no}} will encode lock prefix as usual, +which is the default. + @end table @c man end |