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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] New: Missed optimization : eliminate store if the value is known in all predecessors Date: Fri, 12 Apr 2024 14:32:53 +0000 [thread overview] Message-ID: <bug-114704-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114704 Bug ID: 114704 Summary: Missed optimization : eliminate store if the value is known in all predecessors Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: xxs_chy at outlook dot com Target Milestone: --- Godbolt link: https://godbolt.org/z/KEeGTM49E For code like: ``` void src(int *p){ if(*p == 0) goto then; else { dummy(); if(*p == 0) goto then; else return; } then: *p = 0; // *p is already 0, it's dead now } ``` In then basic block, *p is known to be 0 in all predecessors, thus the store "*p = 0" is redundant.
next reply other threads:[~2024-04-12 14:32 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-04-12 14:32 xxs_chy at outlook dot com [this message] 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 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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