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From: "xxs_chy at outlook dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114704] Missed optimization : eliminate store if the value is known in all predecessors
Date: Sat, 13 Apr 2024 13:39:27 +0000 [thread overview]
Message-ID: <bug-114704-4-Ds79KiApqO@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-114704-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114704
--- Comment #3 from XChy <xxs_chy at outlook dot com> ---
(In reply to Andrew Pinski from comment #1)
> Confirmed. A more general testcase:
> ```
> void dummy();
>
> void src(int *p, int a){
> int t = *p;
> if(t == a)
> goto then;
> else {
> dummy();
> t = *p;
> if(t == a)
> goto then;
> else
> return;
> }
>
> then:
> *p = t; // *p is already a, it's dead now
> }
>
> ```
Do you mean "*p = a" at the end?
next prev parent reply other threads:[~2024-04-13 13:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-12 14:32 [Bug tree-optimization/114704] New: " xxs_chy at outlook dot com
2024-04-12 22:34 ` [Bug tree-optimization/114704] " pinskia at gcc dot gnu.org
2024-04-12 22:39 ` pinskia at gcc dot gnu.org
2024-04-12 22:41 ` pinskia at gcc dot gnu.org
2024-04-13 13:39 ` xxs_chy at outlook dot com [this message]
2024-04-13 18:20 ` pinskia at gcc dot gnu.org
2024-04-15 7:59 ` rguenth at gcc dot gnu.org
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