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Subject: [Bug c/101512] New: [11/12 Regression] ICE in
 maybe_trim_constructor_store, at tree-ssa-dse.c:379
Date: Mon, 19 Jul 2021 17:22:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101512

            Bug ID: 101512
           Summary: [11/12 Regression] ICE in
                    maybe_trim_constructor_store, at tree-ssa-dse.c:379
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Changed between 20200503 and 20200510 :


$ cat z1.c
int n();
typedef unsigned long V __attribute__ ((vector_size (64)));
V
foo (int i, V v)
{
  i =3D ((V)(V){n()})[n()];
  return v + i;
}


$ gcc-11-20200503 -c z1.c -O2 -mavx512f
$
$ gcc-12-20210718 -c z1.c -O2 -mavx512f
during GIMPLE pass: dse
z1.c: In function 'foo':
z1.c:8:1: internal compiler error: in maybe_trim_constructor_store, at
tree-ssa-dse.c:379
    8 | }
      | ^
0xcf24be maybe_trim_constructor_store
        ../../gcc/tree-ssa-dse.c:379
0xcf24be maybe_trim_partially_dead_store
        ../../gcc/tree-ssa-dse.c:605
0xcf24be dse_optimize_stmt
        ../../gcc/tree-ssa-dse.c:1146
0xcf24be execute
        ../../gcc/tree-ssa-dse.c:1237=