https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95679

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-07-15
   Target Milestone|---                         |11.0
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot 
gnu.org
           Keywords|                            |needs-bisection

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Whoops, this fell through the cracks - I can't reproduce with
g:7a4770f0394751860ee54520b23007938907ac33 though.  Confirmed with your
cited rev. where we see

 <minus_expr 0x7ffff6977960
    type <integer_type 0x7ffff682d1f8 public unsigned DI
        size <integer_cst 0x7ffff680ccd8 constant 64>
        unit-size <integer_cst 0x7ffff680ccf0 constant 8>
        align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff682d1f8 precision:64 min <integer_cst 0x7ffff682a108 0> max <integer_cst
0x7ffff680d5c0 18446744073709551615>>

    arg:0 <nop_expr 0x7ffff6976e80 type <integer_type 0x7ffff682d1f8>
        constant
        arg:0 <addr_expr 0x7ffff694b140 type <pointer_type 0x7ffff6945348>
            constant arg:0 <function_decl 0x7ffff693d600 u1>
            t.c:8:17 start: t.c:8:17 finish: t.c:8:17>>
    arg:1 <nop_expr 0x7ffff6976e60 type <integer_type 0x7ffff682d1f8>

        arg:0 <ssa_name 0x7ffff6968090 type <error_mark 0x7ffff680ccc0>
            nothrow
            def_stmt 
            version:10 in-free-list>>>

and thus a released SSA name.  That's probably inconsistent SCEV cache
not reset before cunroll and the issue is probably still latent.

For curiosity I wonder what "fixed" it.

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