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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/103100] [11/12 Regression] unaligned access generated
 with memset or {} and -O2 -mstrict-align
Date: Fri, 05 Nov 2021 13:26:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103100

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot =
gnu.org
             Status|NEW                         |ASSIGNED

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Mine.
This should fix it (untested):
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 699c105a42a..5d0872be4ef 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -23584,7 +23584,9 @@ aarch64_expand_setmem (rtx *operands)
         over writing.  */
       opt_scalar_int_mode mode_iter;
       FOR_EACH_MODE_IN_CLASS (mode_iter, MODE_INT)
-       if (GET_MODE_BITSIZE (mode_iter.require ()) <=3D MIN (n, copy_limit=
))
+       if (GET_MODE_BITSIZE (mode_iter.require ()) <=3D MIN (n, copy_limit)
+           && (!STRICT_ALIGNMENT
+               || MEM_ALIGN (dst) >=3D GET_MODE_ALIGNMENT (mode_iter.requi=
re
())))
          cur_mode =3D mode_iter.require ();

       gcc_assert (cur_mode !=3D BLKmode);=