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* [Bug rtl-optimization/78085] extra sign extend if used to store in 32bit and return 64bit and the upper bits are known to be zeroed.
[not found] <bug-78085-4@http.gcc.gnu.org/bugzilla/>
@ 2021-08-07 5:33 ` pinskia at gcc dot gnu.org
2022-09-26 6:19 ` crazylht at gmail dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-07 5:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78085
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|target |rtl-optimization
Last reconfirmed| |2021-08-07
Ever confirmed|0 |1
Summary|Unexpected cltq instruction |extra sign extend if used
|on Linux x86-64 for |to store in 32bit and
|conversion of positive int |return 64bit and the upper
|to long |bits are known to be
| |zeroed.
Status|UNCONFIRMED |NEW
Keywords| |missed-optimization
Severity|normal |enhancement
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/78085] extra sign extend if used to store in 32bit and return 64bit and the upper bits are known to be zeroed.
[not found] <bug-78085-4@http.gcc.gnu.org/bugzilla/>
2021-08-07 5:33 ` [Bug rtl-optimization/78085] extra sign extend if used to store in 32bit and return 64bit and the upper bits are known to be zeroed pinskia at gcc dot gnu.org
@ 2022-09-26 6:19 ` crazylht at gmail dot com
2022-09-26 16:29 ` pinskia at gcc dot gnu.org
2022-09-26 16:33 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 4+ messages in thread
From: crazylht at gmail dot com @ 2022-09-26 6:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78085
--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
It looks like this issue has been fixed in GCC13 trunk,cltq is gone for the
first and the last function, but i don't know which exact commit fixed it.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/78085] extra sign extend if used to store in 32bit and return 64bit and the upper bits are known to be zeroed.
[not found] <bug-78085-4@http.gcc.gnu.org/bugzilla/>
2021-08-07 5:33 ` [Bug rtl-optimization/78085] extra sign extend if used to store in 32bit and return 64bit and the upper bits are known to be zeroed pinskia at gcc dot gnu.org
2022-09-26 6:19 ` crazylht at gmail dot com
@ 2022-09-26 16:29 ` pinskia at gcc dot gnu.org
2022-09-26 16:33 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-09-26 16:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78085
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
From REE:
Trying to eliminate extension:
(insn 9 8 15 2 (set (reg:DI 0 ax [orig:88 _3 ] [88])
(sign_extend:DI (reg:SI 0 ax [orig:84 _3 ] [84]))) "a.c":6:9 160
{*extendsidi2_rex64}
(nil))
Tentatively merged extension with definition :
(insn 7 6 8 2 (parallel [
(set (reg:DI 0 ax)
(zero_extend:DI (and:SI (reg:SI 0 ax [86])
(const_int 3 [0x3]))))
(clobber (reg:CC 17 flags))
]) "a.c":5:4 -1
(nil))
deferring rescan insn with uid = 7.
All merges were successful.
Eliminated the extension.
deferring deletion of insn with uid = 9.
Elimination opportunities = 1 realized = 1
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/78085] extra sign extend if used to store in 32bit and return 64bit and the upper bits are known to be zeroed.
[not found] <bug-78085-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2022-09-26 16:29 ` pinskia at gcc dot gnu.org
@ 2022-09-26 16:33 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-09-26 16:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78085
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Most likely r13-1942-gc23a9c87cc62bd .
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-09-26 16:33 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-78085-4@http.gcc.gnu.org/bugzilla/>
2021-08-07 5:33 ` [Bug rtl-optimization/78085] extra sign extend if used to store in 32bit and return 64bit and the upper bits are known to be zeroed pinskia at gcc dot gnu.org
2022-09-26 6:19 ` crazylht at gmail dot com
2022-09-26 16:29 ` pinskia at gcc dot gnu.org
2022-09-26 16:33 ` pinskia at gcc dot gnu.org
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