[Bug target/112990] [14 Regression][s390x] ICE in related_vector_mode, at stor-layout.cc:539 since r14-3381-g27de9aa152141e

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112990

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
   Last reconfirmed|                            |2023-12-13
             Status|UNCONFIRMED                 |ASSIGNED
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
So we're getting TImode vectors here for some reason (uninit?).
The VEC_PERM is

    def_stmt z_14 = VEC_PERM_EXPR <y_7(D), y_7(D), { 1, 1 }>;

with

 <ssa_name 0x7ffff7016c18
    type <vector_type 0x7ffff7148bd0 V2DI
        type <integer_type 0x7ffff701f738 long int DI
            size <integer_cst 0x7ffff700bab0 constant 64>
            unit-size <integer_cst 0x7ffff700bac8 constant 8>
            align:64 warn_if_not_align:0 symtab:0 alias-set 1 canonical-type
0x7ffff701f738 precision:64 min <integer_cst 0x7ffff700bd38
-9223372036854775808> max <integer_cst 0x7ffff700bd50 9223372036854775807>
            pointer_to_this <pointer_type 0x7ffff702d7e0>>
        sizes-gimplified TI
        size <integer_cst 0x7ffff700baf8 constant 128>
        unit-size <integer_cst 0x7ffff700bb10 constant 16>
        align:128 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff7148b28 nunits:2
        pointer_to_this <pointer_type 0x7ffff71bd540>>
    visited var <var_decl 0x7ffff7017480 y>
    def_stmt GIMPLE_NOP
    version:7>