public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [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) -- links below jump to the message on this page -- 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
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).