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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105173] [10/11/12 Regression] ICE: during
 GIMPLE pass: reassoc: verify_ssa failed (definition in block 2 follows the
 use) at -Ofast with decimals since r7-950-g8a85cee26eabf5cf
Date: Wed, 06 Apr 2022 09:40:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105173

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
  <bb 2> [local count: 1073741824]:
  i.0_1 =3D i;
  _2 =3D (_Decimal32) i.0_1;
  _12 =3D (_Decimal64) _2;
  _13 =3D (_Decimal64) d_8(D);
  _3 =3D _12 * _13;
  _4 =3D (_Decimal64) c_9(D);
  _5 =3D -_4;
  _6 =3D _3 * _5;
  d_10 =3D (_Decimal32) _6;
  _11 =3D (int) d_10;

Transforming _12 =3D (_Decimal64) _2;
 into _14 =3D _12 * -1.0e+0;
Transforming _3 =3D _12 * _13;
 into _15 =3D _14 * _4;
Transforming _6 =3D _3 * _5;
 into _6 =3D _15 * _13;

  <bb 2> [local count: 1073741824]:
  i.0_1 =3D i;
  _2 =3D (_Decimal32) i.0_1;
  _14 =3D _12 * -1.0e+0;
  _12 =3D (_Decimal64) _2;
  _13 =3D (_Decimal64) d_8(D);
  _4 =3D (_Decimal64) c_9(D);
  _15 =3D _14 * _4;
  _6 =3D _15 * _13;
  d_10 =3D (_Decimal32) _6;
  _11 =3D (int) d_10;
  return _11;

and the logic wrt

              gimple *insert_point
                =3D find_insert_point (stmt, oe1->op, oe2->op);
...
              if (insert_point =3D=3D gsi_stmt (gsi))
                gsi_insert_before (&gsi, stmt, GSI_SAME_STMT);
              else
                insert_stmt_after (stmt, insert_point);

does not work for

(gdb) p debug_gimple_stmt (stmt)
_12 =3D (_Decimal64) _2;
$4 =3D void
(gdb) p oe1->op
$5 =3D <ssa_name 0x7ffff667e120 12>
(gdb) p oe2->op
$6 =3D <real_cst 0x7ffff6681540>

testing a fix.=