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| author | liuhongt <hongtao.liu@intel.com> | 2020-03-16 11:03:12 +0800 |
|---|---|---|
| committer | liuhongt <hongtao.liu@intel.com> | 2020-04-26 14:26:24 +0800 |
| commit | a09f656b267b9a684f038fba7cadfe98e2f18892 (patch) | |
| tree | 875224c50cb561179eb700b3a751a787ad9b87f8 /gas/ChangeLog | |
| parent | ec9c4d83220d0991c07a37116e27d4449061f2b8 (diff) | |
| download | gdb-a09f656b267b9a684f038fba7cadfe98e2f18892.zip gdb-a09f656b267b9a684f038fba7cadfe98e2f18892.tar.gz gdb-a09f656b267b9a684f038fba7cadfe98e2f18892.tar.bz2 | |
Improve -mlfence-after-load
1.Implict load for POP/POPF/POPA/XLATB, no load for Anysize insns
2. Add -mlfence-before-ret=shl/yes, adjust operand size of
or/not/shl according to ret's.
3. Issue warning for REP CMPS/SCAS since they would affect control
flow behavior.
4. Adjust testcases and documents.
gas/Changelog:
* config/tc-i386.c (lfence_before_ret_shl): New member.
(load_insn_p): implict load for POP/POPA/POPF/XLATB, no load
for Anysize insns.
(insert_after_load): Issue warning for REP CMPS/SCAS.
(insert_before_before): Handle iret, Handle
-mlfence-before-ret=shl, Adjust operand size of or/not/shl to ret's,
(md_parse_option): Change -mlfence-before-ret=[none|not|or] to
-mlfence-before-ret=[none/not/or/shl/yes].
Enable -mlfence-before-ret=shl when
-mlfence-beofre-indirect-branch=all and no explict -mlfence-before-ret option.
(md_show_usage): Ditto.
* doc/c-i386.texi: Ditto.
* testsuite/gas/i386/i386.exp: Add new testcases.
* testsuite/gas/i386/lfence-load-b.d: New.
* testsuite/gas/i386/lfence-load-b.e: New.
* testsuite/gas/i386/lfence-load.d: Modified.
* testsuite/gas/i386/lfence-load.e: New.
* testsuite/gas/i386/lfence-load.s: Modified.
* testsuite/gas/i386/lfence-ret-a.d: Modified.
* testsuite/gas/i386/lfence-ret-b.d: Modified.
* testsuite/gas/i386/lfence-ret-c.d: New.
* testsuite/gas/i386/lfence-ret-d.d: New.
* testsuite/gas/i386/lfence-ret.s: Modified.
* testsuite/gas/i386/x86-64-lfence-load-b.d: New.
* testsuite/gas/i386/x86-64-lfence-load.d: Modified.
* testsuite/gas/i386/x86-64-lfence-load.s: Modified.
* testsuite/gas/i386/x86-64-lfence-ret-a.d: Modified.
* testsuite/gas/i386/x86-64-lfence-ret-b.d: Modified.
* testsuite/gas/i386/x86-64-lfence-ret-c.d: New.
* testsuite/gas/i386/x86-64-lfence-ret-d.d: New
* testsuite/gas/i386/x86-64-lfence-ret-e.d: New.
* testsuite/gas/i386/x86-64-lfence-ret.e: New.
* testsuite/gas/i386/x86-64-lfence-ret.s: New.
Diffstat (limited to 'gas/ChangeLog')
| -rw-r--r-- | gas/ChangeLog | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog index f31504b..c4df0e1 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,39 @@ +2020-04-26 Hongtao Liu <hongtao.liu@intel.com + + * config/tc-i386.c (lfence_before_ret_shl): New member. + (load_insn_p): implict load for POP/POPA/POPF/XLATB, no load + for Anysize insns. + (insert_after_load): Issue warning for REP CMPS/SCAS. + (insert_before_before): Handle iret, Handle + -mlfence-before-ret=shl, Adjust operand size of or/not/shl to ret's, + (md_parse_option): Change -mlfence-before-ret=[none|not|or] to + -mlfence-before-ret=[none/not/or/shl/yes]. + Enable -mlfence-before-ret=shl when + -mlfence-beofre-indirect-branch=all and no explict -mlfence-before-ret option. + (md_show_usage): Ditto. + * doc/c-i386.texi: Ditto. + * testsuite/gas/i386/i386.exp: Add new testcases. + * testsuite/gas/i386/lfence-load-b.d: New. + * testsuite/gas/i386/lfence-load-b.e: New. + * testsuite/gas/i386/lfence-load.d: Modified. + * testsuite/gas/i386/lfence-load.e: New. + * testsuite/gas/i386/lfence-load.s: Modified. + * testsuite/gas/i386/lfence-ret-a.d: Modified. + * testsuite/gas/i386/lfence-ret-b.d: Modified. + * testsuite/gas/i386/lfence-ret-c.d: New. + * testsuite/gas/i386/lfence-ret-d.d: New. + * testsuite/gas/i386/lfence-ret.s: Modified. + * testsuite/gas/i386/x86-64-lfence-load-b.d: New. + * testsuite/gas/i386/x86-64-lfence-load.d: Modified. + * testsuite/gas/i386/x86-64-lfence-load.s: Modified. + * testsuite/gas/i386/x86-64-lfence-ret-a.d: Modified. + * testsuite/gas/i386/x86-64-lfence-ret-b.d: Modified. + * testsuite/gas/i386/x86-64-lfence-ret-c.d: New. + * testsuite/gas/i386/x86-64-lfence-ret-d.d: New + * testsuite/gas/i386/x86-64-lfence-ret-e.d: New. + * testsuite/gas/i386/x86-64-lfence-ret.e: New. + * testsuite/gas/i386/x86-64-lfence-ret.s: New. + 2020-04-22 Max Filippov <jcmvbkbc@gmail.com> PR ld/25861 |