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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114734] [14] RISC-V rv64gcv_zvl256b miscompile with
 -flto -O3 -mrvv-vector-bits=zvl
Date: Tue, 16 Apr 2024 11:50:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114734

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
probably -fwhole-program is enough, -flto not needed(?)

  # vectp_g.248_1401 =3D PHI <vectp_g.248_1402(32), &g(143)>
...
  _1411 =3D .SELECT_VL (ivtmp_1409, POLY_INT_CST [2, 2]);
..
  vect__193.250_1403 =3D .MASK_LEN_LOAD (vectp_g.248_1401, 32B, { -1, ... },
_1411, 0);
  vect__194.251_1404 =3D -vect__193.250_1403;
  vect_iftmp.252_1405 =3D (vector([2,2]) long int) vect__194.251_1404;

  # vect_iftmp.252_1406 =3D PHI <vect_iftmp.252_1405(5)>
  # loop_len_1427 =3D PHI <_1411(5)>
...
  _1407 =3D loop_len_1427 + 18446744073709551615;
  _1408 =3D .VEC_EXTRACT (vect_iftmp.252_1406, _1407);
  iftmp.3_1204 =3D _1408;

is stored to b[15].  Doesn't look too odd to me.=