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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/103245] New: Failure to detect abs pattern using multiplication with slightly different casts for unsigned case
Date: Mon, 15 Nov 2021 10:06:39 +0000 [thread overview]
Message-ID: <bug-103245-4@http.gcc.gnu.org/bugzilla/> (raw)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103245
Bug ID: 103245
Summary: Failure to detect abs pattern using multiplication
with slightly different casts for unsigned case
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Blocks: 103228
Target Milestone: ---
While working on PR 103228, I got the testcase for PR 94785 failing.
It fails if I change the casts even:
unsigned int f4 (int v)
{
unsigned int d_6;
int b_5;
int a_4;
_Bool _1;
unsigned int v1_2;
unsigned int _7;
int _9;
_1 = v < 0;
a_4 = (int) _1;
b_5 = -a_4;
_9 = b_5 | 1;
d_6 = (unsigned int) _9;
v1_2 = (unsigned int) v;
_7 = v1_2 * d_6;
return _7;
}
---- CUT ---
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103228
[Bug 103228] [9/10/11/12 Regression] missed optimization with |^ at the gimple
level
next reply other threads:[~2021-11-15 10:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-15 10:06 pinskia at gcc dot gnu.org [this message]
2021-11-15 10:10 ` [Bug tree-optimization/103245] " pinskia at gcc dot gnu.org
2021-11-15 22:43 ` pinskia at gcc dot gnu.org
2021-11-16 2:54 ` pinskia at gcc dot gnu.org
2021-11-16 3:32 ` cvs-commit at gcc dot gnu.org
2021-11-16 3:33 ` pinskia at gcc dot gnu.org
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