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* [Bug tree-optimization/107765] New: missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN
@ 2022-11-19 23:27 pinskia at gcc dot gnu.org
2022-11-22 8:32 ` [Bug tree-optimization/107765] " rguenth at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-11-19 23:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107765
Bug ID: 107765
Summary: missing (int)-(unsigned)int_val to just -int_val if
int_val is known not to contain INT_MIN
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Take:
```
#include <limits.h>
int a(int input)
{
if (input == INT_MIN) __builtin_unreachable();
unsigned t = input;
int tt = -t;
return tt == -input;
}
```
We should be able to optimize this at the tree level because we know we don't
invoke undefined behavior.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107765] missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN
2022-11-19 23:27 [Bug tree-optimization/107765] New: missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN pinskia at gcc dot gnu.org
@ 2022-11-22 8:32 ` rguenth at gcc dot gnu.org
2023-08-31 18:38 ` pinskia at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-11-22 8:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107765
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2022-11-22
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107765] missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN
2022-11-19 23:27 [Bug tree-optimization/107765] New: missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN pinskia at gcc dot gnu.org
2022-11-22 8:32 ` [Bug tree-optimization/107765] " rguenth at gcc dot gnu.org
@ 2023-08-31 18:38 ` pinskia at gcc dot gnu.org
2023-09-01 2:27 ` pinskia at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-08-31 18:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107765
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |pinskia at gcc dot gnu.org
Status|NEW |ASSIGNED
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107765] missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN
2022-11-19 23:27 [Bug tree-optimization/107765] New: missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN pinskia at gcc dot gnu.org
2022-11-22 8:32 ` [Bug tree-optimization/107765] " rguenth at gcc dot gnu.org
2023-08-31 18:38 ` pinskia at gcc dot gnu.org
@ 2023-09-01 2:27 ` pinskia at gcc dot gnu.org
2023-09-01 16:24 ` pinskia at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-01 2:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107765
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |https://gcc.gnu.org/piperma
| |il/gcc-patches/2023-Septemb
| |er/629018.html
Keywords| |patch
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Patch posted:
https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629018.html
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107765] missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN
2022-11-19 23:27 [Bug tree-optimization/107765] New: missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN pinskia at gcc dot gnu.org
` (2 preceding siblings ...)
2023-09-01 2:27 ` pinskia at gcc dot gnu.org
@ 2023-09-01 16:24 ` pinskia at gcc dot gnu.org
2023-09-02 7:03 ` pinskia at gcc dot gnu.org
2023-09-02 7:29 ` pinskia at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-01 16:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107765
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So I have decided to solve the original testcase differently.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107765] missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN
2022-11-19 23:27 [Bug tree-optimization/107765] New: missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN pinskia at gcc dot gnu.org
` (3 preceding siblings ...)
2023-09-01 16:24 ` pinskia at gcc dot gnu.org
@ 2023-09-02 7:03 ` pinskia at gcc dot gnu.org
2023-09-02 7:29 ` pinskia at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-02 7:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107765
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL|https://gcc.gnu.org/piperma |
|il/gcc-patches/2023-Septemb |
|er/629018.html |
Keywords|patch |
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> Patch posted:
> https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629018.html
What I can do is extend:
https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629156.html
To add the test the first patch has. That will remove the unneeded cast and
all.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107765] missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN
2022-11-19 23:27 [Bug tree-optimization/107765] New: missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN pinskia at gcc dot gnu.org
` (4 preceding siblings ...)
2023-09-02 7:03 ` pinskia at gcc dot gnu.org
@ 2023-09-02 7:29 ` pinskia at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-02 7:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107765
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> (In reply to Andrew Pinski from comment #2)
> > Patch posted:
> > https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629018.html
>
> What I can do is extend:
> https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629156.html
>
> To add the test the first patch has. That will remove the unneeded cast and
> all.
Oh and using expr_not_equal_to has the basic code really.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2023-09-02 7:29 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2022-11-19 23:27 [Bug tree-optimization/107765] New: missing (int)-(unsigned)int_val to just -int_val if int_val is known not to contain INT_MIN pinskia at gcc dot gnu.org
2022-11-22 8:32 ` [Bug tree-optimization/107765] " rguenth at gcc dot gnu.org
2023-08-31 18:38 ` pinskia at gcc dot gnu.org
2023-09-01 2:27 ` pinskia at gcc dot gnu.org
2023-09-01 16:24 ` pinskia at gcc dot gnu.org
2023-09-02 7:03 ` pinskia at gcc dot gnu.org
2023-09-02 7:29 ` pinskia at gcc dot gnu.org
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