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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug analyzer/104159] ICE: in finalize, at vector-builder.h:513 with
 -O -fanalyzer
Date: Fri, 21 Jan 2022 11:31:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104159

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-01-21

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
424           break;
425         }
426
427       /* Constants.  */
428       if (tree cst =3D arg->maybe_get_constant ())
429         if (tree result =3D fold_unary (op, type, cst))
430           {
431             if (CONSTANT_CLASS_P (result))
432               return get_or_create_constant_svalue (result);
433

(gdb) p debug_tree (cst)
 <vector_cst 0x7ffff668e558
    type <vector_type 0x7ffff66a53f0 W
        type <integer_type 0x7ffff655f7e0 long unsigned int public unsigned=
 DI
            size <integer_cst 0x7ffff6543d50 constant 64>
            unit-size <integer_cst 0x7ffff6543d68 constant 8>
            align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-ty=
pe
0x7ffff655f7e0 precision:64 min <integer_cst 0x7ffff6563030 0> max <integer=
_cst
0x7ffff6544520 18446744073709551615>
            pointer_to_this <pointer_type 0x7ffff656f348>>
        unsigned V2DI
        size <integer_cst 0x7ffff6543d98 constant 128>
        unit-size <integer_cst 0x7ffff6543db0 constant 16>
        align:128 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff66a5348 nunits:2 context <translation_unit_decl 0x7ffff6551bb8 t.c>>
    constant npatterns:1 nelts-per-pattern:1
    elt:0:  <integer_cst 0x7ffff6563030 type <integer_type 0x7ffff655f7e0 l=
ong
unsigned int> constant 0>>
$1 =3D void
(gdb) p debug_tree (type)
 <vector_type 0x7ffff66a5000 T
    type <integer_type 0x7ffff655f5e8 int public SI
        size <integer_cst 0x7ffff6543f90 constant 32>
        unit-size <integer_cst 0x7ffff6543fa8 constant 4>
        align:32 warn_if_not_align:0 symtab:0 alias-set 1 canonical-type
0x7ffff655f5e8 precision:32 min <integer_cst 0x7ffff6543f48 -2147483648> max
<integer_cst 0x7ffff6543f60 2147483647>
        pointer_to_this <pointer_type 0x7ffff6567a80>>
    V1SI size <integer_cst 0x7ffff6543f90 32> unit-size <integer_cst
0x7ffff6543fa8 4>
    align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff667bbd0 nunits:1 context <translation_unit_decl 0x7ffff6551bb8 t.c>
    pointer_to_this <pointer_type 0x7ffff66a5bd0>>
$2 =3D void

and using VIEW_CONVERT_EXPR as op.  For truncations you should use
VEC_PACK_TRUNC, but eventually giving up for not explicitely handled
cases would be better.

Note the original stmt is

_1 =3D VIEW_CONVERT_EXPR<T>(_4);

with both _4 and _1 V1SI (signed/unsigned convert), so not sure how
we got to V2DI here.=