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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/113339] New: `-a/-b` is not simplified to `a/b` if done in seperate statements Date: Thu, 11 Jan 2024 19:20:16 +0000 [thread overview] Message-ID: <bug-113339-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113339 Bug ID: 113339 Summary: `-a/-b` is not simplified to `a/b` if done in seperate statements Product: gcc Version: 14.0 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: ``` int unopt(int a, int b) { a = -a; b = -b; return a / b; } int opt(int a, int b) { return -a / -b; } ``` I would have expected these 2 would produce the same assembly but only opt is optimized to a/b and the neg is removed. Note LLVM does not do either: https://github.com/llvm/llvm-project/issues/77717 .
next reply other threads:[~2024-01-11 19:20 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-01-11 19:20 pinskia at gcc dot gnu.org [this message] 2024-01-11 19:23 ` [Bug tree-optimization/113339] " pinskia at gcc dot gnu.org 2024-01-11 19:33 ` pinskia at gcc dot gnu.org 2024-01-11 21:23 ` pinskia at gcc dot gnu.org
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