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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99746] ICE in vect_get_vec_defs_for_operand,
 at tree-vect-stmts.c:1450
Date: Wed, 24 Mar 2021 09:05:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99746

--- Comment #6 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
A bit reduced test-case:

SUBROUTINE CLAREF(A, WANTZ, Z, ICOL1, ITMP1, ITMP2, T1, T2, V2)
LOGICAL            BLOCK, WANTZ
COMPLEX            T1, T2, V2
COMPLEX            A(LDA, *), VECS, Z(LDA, *)
COMPLEX            SUM=20
LOGICAL            LSAME
IF (LSAME) THEN
      DO 30 K =3D ITMP1, ITMP2, 3
         T1 =3D VECS0
30       CONTINUE
ELSE
   IF (BLOCK) THEN
      DO 90 K =3D ITMP1, ITMP2 - 1, 3
         A(J, ICOL1) =3D ITMP1
         IF (WANTZ) THEN
            DO 80 J =3D ITMP1, ITMP2
               SUM =3D  ICOL1
               Z(J, 3) =3D V23
80             CONTINUE
         END IF
90       CONTINUE
      DO 120 K =3D ITMP1, ITMP2
         V2 =3D VECS()
         DO 100 J =3D ITMP1, ITMP2
            A(J, ICOL1) =3D A(J, ICOL1) - SUM
100          CONTINUE
         IF (WANTZ) THEN
            DO 110 J =3D 1, 3
               SUM =3D Z(J, ICOL1)
               Z(J, ICOL1) =3D 0
110             CONTINUE
         END IF
         ICOL1 =3D ICOL1 + 1
120       CONTINUE
   ELSE
      DO 130 J =3D ITMP1, ITMP2
         SUM =3D T1 * A(J, ICOL1) + T2 * A(J, 1) + V2 * A(J, 2)
         A(J, ICOL1) =3D SUM
         A(J, ICOL1 + 2) =3D SUM * V1
130       CONTINUE
   END IF
END IF
END=