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From: "zhongyunde at huawei dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/110638] New: [13 regression] memcpy should be inlined with
 sve loop
Date: Wed, 12 Jul 2023 07:42:11 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 13.1.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110638

            Bug ID: 110638
           Summary: [13 regression] memcpy should be inlined with sve loop
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhongyunde at huawei dot com
  Target Milestone: ---

* test:https://gcc.godbolt.org/z/39KddjbE4
```
void va(struct args_t * func_args)
{
    for (int nl =3D 0; nl < iterations; nl++) {
        for (int i =3D 0; i < LEN_1D; i++) {
            a[i] =3D b[i];
        }
        dummy(a, b);
    }
    return ;
}
```

* gcc12: don't transform the loop into a memcpy call, so it can make use of=
 the
new sve feature.

* gcc13: use a normal 'bl      memcpy'

The above regression start from gcc13.=