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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109093] [13 regression] csmith: a February runtime bug ?
Date: Wed, 15 Mar 2023 09:19:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109093

--- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I'd like to understand what is the difference between those .DEFERRED_INITs=
 on
unused vars and normal vars.
If I try
typedef int V __attribute__((vector_size (16)));

__attribute__((noipa)) void
foo ()
{
  V v;
  V *p =3D &v;
  asm ("" : "+r" (p));
  *p =3D (V) {};
  asm volatile ("" : : : "r12", "r13", "r14");
}

__attribute__((noipa)) void
bar ()
{
  V v;
  V *p =3D &v;
  asm ("" : "+r" (p));
  *p =3D (V) {};
  asm volatile ("" : : : "r12", "r13");
}

int
main ()
{
  foo ();
  bar ();
}

with either -O2 -mavx or -O2 -mavx -fno-omit-frame-pointer, then everything=
 is
properly aligned.=