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From: "gabravier at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94782] New: Simple multiplication-related arithmetic not optimized to direct multiplication
Date: Mon, 27 Apr 2020 02:08:53 +0000 [thread overview]
Message-ID: <bug-94782-4@http.gcc.gnu.org/bugzilla/> (raw)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94782
Bug ID: 94782
Summary: Simple multiplication-related arithmetic not optimized
to direct multiplication
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gabravier at gmail dot com
Target Milestone: ---
int f(int a, int b)
{
return (int)((a - 1U) * b) + b;
}
Can be optimized to `a * b`. LLVM does this transformation, GCC does not.
Comparison here : https://godbolt.org/z/LFJwFJ
next reply other threads:[~2020-04-27 2:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-27 2:08 gabravier at gmail dot com [this message]
2020-04-27 7:07 ` [Bug tree-optimization/94782] " rguenth at gcc dot gnu.org
2023-02-17 18:16 ` gabravier at gmail dot com
2023-02-17 18:24 ` pinskia at gcc dot gnu.org
2023-02-17 18:28 ` pinskia at gcc dot gnu.org
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