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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94482] [8/9/10 Regression] Inserting into vector with
 optimization enabled on x86 generates incorrect result
Date: Mon, 06 Apr 2020 07:29:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94482

--- Comment #15 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #12)
> Reduced testcase (-O2 -msse2 -m32):
> typedef unsigned V __attribute__ ((__vector_size__ (16)));
> union U
> {
>   V j;
>   unsigned long long i __attribute__ ((__vector_size__ (16)));
> };
>=20
> static inline __attribute__((always_inline)) V
> foo (unsigned long long a)
> {
>   union U z =3D { .j =3D (V) {} };
>   for (unsigned long i =3D 0; i < 1; i++)
>     z.i[i] =3D a;
>   return z.j;
> }
>=20
> static inline __attribute__((always_inline)) V
> bar (V a, unsigned long long i, int q)
> {
>   union U z =3D { .j =3D a };
>   z.i[q] =3D i;
>   return z.j;
> }
>=20
> int
> main ()
> {
>   union U z =3D { .j =3D bar (foo (1729), 2, 1) };
>   if (z.i[0] !=3D 1729)
>     __builtin_abort ();
>   return 0;
> }

Ok, Jakub's version started to Abort with r7-987-gf17a223de829cb5f and can =
be
seen on current master.=