public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug middle-end/41742] Unnecessary zero-extension at -O2 but not -O1
[not found] <bug-41742-4@http.gcc.gnu.org/bugzilla/>
@ 2012-08-16 10:40 ` segher at gcc dot gnu.org
2021-08-16 8:07 ` pinskia at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 4+ messages in thread
From: segher at gcc dot gnu.org @ 2012-08-16 10:40 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41742
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-08-16
CC| |segher at gcc dot gnu.org
Ever Confirmed|0 |1
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> 2012-08-16 10:39:45 UTC ---
Still happens on mainline: -O2 still has the superfluous sign-extend,
but now the -O1 code is perfect.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/41742] Unnecessary zero-extension at -O2 but not -O1
[not found] <bug-41742-4@http.gcc.gnu.org/bugzilla/>
2012-08-16 10:40 ` [Bug middle-end/41742] Unnecessary zero-extension at -O2 but not -O1 segher at gcc dot gnu.org
@ 2021-08-16 8:07 ` pinskia at gcc dot gnu.org
2023-03-23 13:54 ` bergner at gcc dot gnu.org
2023-04-11 17:07 ` aagarwa at gcc dot gnu.org
3 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-16 8:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41742
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Severity|normal |enhancement
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/41742] Unnecessary zero-extension at -O2 but not -O1
[not found] <bug-41742-4@http.gcc.gnu.org/bugzilla/>
2012-08-16 10:40 ` [Bug middle-end/41742] Unnecessary zero-extension at -O2 but not -O1 segher at gcc dot gnu.org
2021-08-16 8:07 ` pinskia at gcc dot gnu.org
@ 2023-03-23 13:54 ` bergner at gcc dot gnu.org
2023-04-11 17:07 ` aagarwa at gcc dot gnu.org
3 siblings, 0 replies; 4+ messages in thread
From: bergner at gcc dot gnu.org @ 2023-03-23 13:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41742
Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bergner at gcc dot gnu.org
--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> ---
Update: current code (both powerpc64-linux and powerpc64le-linux) still contain
the unneeded rlwinm, but now we've replaced the loop with a call to libc's
memset and we do not shrink-wrap the call due to the use of the non-volatile
r31 in the entry block.
foo:
cmpdi 0,5,0
std 31,-8(1)
stdu 1,-128(1)
mr 31,3
beq 0,.L4
mflr 0
rlwinm 4,4,0,0xff
std 0,144(1)
bl memset
nop
ld 0,144(1)
mtlr 0
.L4:
addi 1,1,128
mr 3,31
ld 31,-8(1)
blr
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/41742] Unnecessary zero-extension at -O2 but not -O1
[not found] <bug-41742-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2023-03-23 13:54 ` bergner at gcc dot gnu.org
@ 2023-04-11 17:07 ` aagarwa at gcc dot gnu.org
3 siblings, 0 replies; 4+ messages in thread
From: aagarwa at gcc dot gnu.org @ 2023-04-11 17:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41742
Ajit Kumar Agarwal <aagarwa at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-04-11 17:07 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <bug-41742-4@http.gcc.gnu.org/bugzilla/>
2012-08-16 10:40 ` [Bug middle-end/41742] Unnecessary zero-extension at -O2 but not -O1 segher at gcc dot gnu.org
2021-08-16 8:07 ` pinskia at gcc dot gnu.org
2023-03-23 13:54 ` bergner at gcc dot gnu.org
2023-04-11 17:07 ` aagarwa at gcc dot gnu.org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).