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* [Bug rtl-optimization/115523] New: [avr] Remove SFmode insns
@ 2024-06-17 12:48 gjl at gcc dot gnu.org
2024-06-17 12:51 ` [Bug rtl-optimization/115523] " gjl at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: gjl at gcc dot gnu.org @ 2024-06-17 12:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115523
Bug ID: 115523
Summary: [avr] Remove SFmode insns
Product: gcc
Version: 14.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gjl at gcc dot gnu.org
Target Milestone: ---
Created attachment 58448
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58448&action=edit
sfmode.c: C test case
There is currently the problem that subreg lowering is producing code that
later passes cannot really digest:
With avr-gcc v14.1:
$ avr-gcc sfmode.c -Os -c -mmcu=atmega8 -dp -save-temps -dumpbase "" &&
avr-size sfmode.o
text data bss dec hex filename
160 0 0 160 a0 sfmode.o
whereas with v8:
text data bss dec hex filename
40 0 0 40 28 sfmode.o
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/115523] [avr] Remove SFmode insns
2024-06-17 12:48 [Bug rtl-optimization/115523] New: [avr] Remove SFmode insns gjl at gcc dot gnu.org
@ 2024-06-17 12:51 ` gjl at gcc dot gnu.org
2024-06-17 16:02 ` [Bug target/115523] " avr at gjlay dot de
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: gjl at gcc dot gnu.org @ 2024-06-17 12:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115523
--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
That bloat can be worked around by taking away the SFmode insns in avr.md.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/115523] [avr] Remove SFmode insns
2024-06-17 12:48 [Bug rtl-optimization/115523] New: [avr] Remove SFmode insns gjl at gcc dot gnu.org
2024-06-17 12:51 ` [Bug rtl-optimization/115523] " gjl at gcc dot gnu.org
@ 2024-06-17 16:02 ` avr at gjlay dot de
2024-06-17 16:41 ` [Bug rtl-optimization/115523] " gjl at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: avr at gjlay dot de @ 2024-06-17 16:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115523
--- Comment #2 from Georg-Johann Lay <avr at gjlay dot de> ---
Am 17.06.24 um 17:06 schrieb pinskia at gcc dot gnu.org:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115523
>
> Andrew Pinski <pinskia at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |pinskia at gcc dot gnu.org
> Component|rtl-optimization |target
>
This is an issue in the RTL passes, subreg-lowering vs. reg alloc.
It's just the case that the backend can (partially) hack around it.
Johann
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/115523] [avr] Remove SFmode insns
2024-06-17 12:48 [Bug rtl-optimization/115523] New: [avr] Remove SFmode insns gjl at gcc dot gnu.org
2024-06-17 12:51 ` [Bug rtl-optimization/115523] " gjl at gcc dot gnu.org
2024-06-17 16:02 ` [Bug target/115523] " avr at gjlay dot de
@ 2024-06-17 16:41 ` gjl at gcc dot gnu.org
2024-06-17 16:51 ` pinskia at gcc dot gnu.org
2024-06-17 17:00 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: gjl at gcc dot gnu.org @ 2024-06-17 16:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115523
--- Comment #3 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Andrew, in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114243#c2 you wrote
that the issue is going to be fixed for RISC-V. You have a PR for that, and
what's the state of it?
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/115523] [avr] Remove SFmode insns
2024-06-17 12:48 [Bug rtl-optimization/115523] New: [avr] Remove SFmode insns gjl at gcc dot gnu.org
` (2 preceding siblings ...)
2024-06-17 16:41 ` [Bug rtl-optimization/115523] " gjl at gcc dot gnu.org
@ 2024-06-17 16:51 ` pinskia at gcc dot gnu.org
2024-06-17 17:00 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-06-17 16:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115523
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Georg-Johann Lay from comment #3)
> Andrew, in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114243#c2 you wrote
> that the issue is going to be fixed for RISC-V. You have a PR for that, and
> what's the state of it?
I am not 100% sure if this is the latest version of the patch set though, but
it was posted to the gcc-patches@ list in late May:
https://inbox.sourceware.org/gcc-patches/20240512225738.528917-2-juzhe.zhong@rivai.ai/
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/115523] [avr] Remove SFmode insns
2024-06-17 12:48 [Bug rtl-optimization/115523] New: [avr] Remove SFmode insns gjl at gcc dot gnu.org
` (3 preceding siblings ...)
2024-06-17 16:51 ` pinskia at gcc dot gnu.org
@ 2024-06-17 17:00 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-06-17 17:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115523
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> I am not 100% sure if this is the latest version of the patch set though,
> but it was posted to the gcc-patches@ list in late May:
> https://inbox.sourceware.org/gcc-patches/20240512225738.528917-2-juzhe.
> zhong@rivai.ai/
Oh this is just the analysis part, the actually code changing part has not been
posted yet:
> And we will enable register coalsece with subreg liveness tracking in the followup patches.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2024-06-17 17:00 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2024-06-17 12:48 [Bug rtl-optimization/115523] New: [avr] Remove SFmode insns gjl at gcc dot gnu.org
2024-06-17 12:51 ` [Bug rtl-optimization/115523] " gjl at gcc dot gnu.org
2024-06-17 16:02 ` [Bug target/115523] " avr at gjlay dot de
2024-06-17 16:41 ` [Bug rtl-optimization/115523] " gjl at gcc dot gnu.org
2024-06-17 16:51 ` pinskia at gcc dot gnu.org
2024-06-17 17:00 ` pinskia at gcc dot gnu.org
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