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From: "zhongyunde at huawei dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107190] New: [aarch64] regression with optimization -fexpensive-optimizations
Date: Sun, 09 Oct 2022 10:33:16 +0000 [thread overview]
Message-ID: <bug-107190-4@http.gcc.gnu.org/bugzilla/> (raw)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107190
Bug ID: 107190
Summary: [aarch64] regression with optimization
-fexpensive-optimizations
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zhongyunde at huawei dot com
Target Milestone: ---
This case is simplify from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107090,
and we can see that the codegen of function `test_m` has some regression with
optimization -fexpensive-optimizations, https://gcc.godbolt.org/z/zbKrEox4j
This is because the pass 208t.widening_mul is controlled by
-fexpensive-optimizations (default on at -O3), it conversion
```
m_12 = m_9 + m1_10;
if (m1_10 > m_12)
```
into
```
_17 = .ADD_OVERFLOW (m_9, m1_10);
m_12 = REALPART_EXPR <_17>;
_18 = IMAGPART_EXPR <_17>;
if (_18 != 0)``
```
next reply other threads:[~2022-10-09 10:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-09 10:33 zhongyunde at huawei dot com [this message]
2022-10-10 16:54 ` [Bug rtl-optimization/107190] " pinskia at gcc dot gnu.org
2022-10-10 17:31 ` [Bug middle-end/107190] " pinskia at gcc dot gnu.org
2023-05-19 1:22 ` pinskia at gcc dot gnu.org
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