[Bug libc/28572] Misaligned accesses in test-memcpy and test-mempcpy on hppa

["dave.anglin at bell dot net" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28572

--- Comment #6 from dave.anglin at bell dot net ---
On 2021-11-11 12:39 p.m., goldstein.w.n at gmail dot com wrote:
> commit d585ba47fcda99fdf228e3e45a01b11a15efbc5a
> Author: Noah Goldstein<goldstein.w.n@gmail.com>
> Date:   Mon Nov 1 00:49:48 2021 -0500
>
>      string: Make tests birdirectional test-memcpy.c
>
>
> If its d585ba47fcda99fdf228e3e45a01b11a15efbc5a then the issue is simply with
> the new tests.
It's the new tests that introduced the unaligned accesses.  That works okay on
x86 but not
on targets like PA-RISC that require strict alignment.  Even on x86, I believe
unaligned accesses
are slower than aligned ones.

There's a unaligned handler in PA-RISC Linux kernel but it's slow.
>
> I added them really just for x86_64 because the large memcpy case has some
> complicated logic that was not previously tested.
>
> Possibly for the large memcpy tests we could only iterate through
> implementations returned by the ifunc and skip the generic/simple
> implementations to speed things up?
Test passes on hppa with change change attached to bug but takes about 13
minutes.

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