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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-10-21 06:15:31 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-10-22 14:45:13 -0700 |
| commit | c8480b58e1968f209b6365af7422678f348222c2 (patch) | |
| tree | ff36a1eb3ca713e3216661ce17cdf183e54fef18 /gas/doc | |
| parent | aab00c2dff7511883e46735ef5e4582acd4d9911 (diff) | |
| download | gdb-c8480b58e1968f209b6365af7422678f348222c2.zip gdb-c8480b58e1968f209b6365af7422678f348222c2.tar.gz gdb-c8480b58e1968f209b6365af7422678f348222c2.tar.bz2 | |
x86: Add -muse-unaligned-vector-move to assembler
Unaligned load/store instructions on aligned memory or register are as
fast as aligned load/store instructions on modern Intel processors. Add
a command-line option, -muse-unaligned-vector-move, to x86 assembler to
encode encode aligned vector load/store instructions as unaligned
vector load/store instructions.
* NEWS: Mention -muse-unaligned-vector-move.
* config/tc-i386.c (use_unaligned_vector_move): New.
(encode_with_unaligned_vector_move): Likewise.
(md_assemble): Call encode_with_unaligned_vector_move for
-muse-unaligned-vector-move.
(OPTION_MUSE_UNALIGNED_VECTOR_MOVE): New.
(md_longopts): Add -muse-unaligned-vector-move.
(md_parse_option): Handle -muse-unaligned-vector-move.
(md_show_usage): Add -muse-unaligned-vector-move.
* doc/c-i386.texi: Document -muse-unaligned-vector-move.
* testsuite/gas/i386/i386.exp: Run unaligned-vector-move and
x86-64-unaligned-vector-move.
* testsuite/gas/i386/unaligned-vector-move.d: New file.
* testsuite/gas/i386/unaligned-vector-move.s: Likewise.
* testsuite/gas/i386/x86-64-unaligned-vector-move.d: Likewise.
Diffstat (limited to 'gas/doc')
| -rw-r--r-- | gas/doc/c-i386.texi | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi index 99576ef..6245d9b 100644 --- a/gas/doc/c-i386.texi +++ b/gas/doc/c-i386.texi @@ -316,6 +316,12 @@ Valid @var{CPU} values are identical to the processor list of This option specifies that the assembler should encode SSE instructions with VEX prefix. +@cindex @samp{-muse-unaligned-vector-move} option, i386 +@cindex @samp{-muse-unaligned-vector-move} option, x86-64 +@item -muse-unaligned-vector-move +This option specifies that the assembler should encode aligned vector +move as unaligned vector move. + @cindex @samp{-msse-check=} option, i386 @cindex @samp{-msse-check=} option, x86-64 @item -msse-check=@var{none} |