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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/101009] [10/11/12 Regression] wrong code with
 "-O3 -fno-tree-sra"
Date: Fri, 11 Jun 2021 07:21:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101009

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[12 Regression] wrong code  |[10/11/12 Regression] wrong
                   |with "-O3 -fno-tree-sra"    |code with "-O3
                   |                            |-fno-tree-sra"
   Target Milestone|12.0                        |10.4
      Known to work|                            |9.4.0

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
With -O2 -fno-tree-sra -fno-tree-pre -ftree-loop-distribution even GCC 10
miscompiles the code.  For dg-torture:

/* { dg-do run } */
/* { dg-additional-options "-fno-tree-sra -fno-tree-pre
-ftree-loop-distribution" } */

struct a {
  unsigned b;
  unsigned c;
} e, *f =3D &e;
int d =3D 1;
int main() {
  for (; d; d--) {
    struct a g[] =3D {{2, 1}, {2, 1}};
    *f =3D g[1];
  }
  if (e.c !=3D 1)
    __builtin_abort ();
  return 0;
}=