[Bug tree-optimization/91162] [7/8 Regression] ICE: tree check: expected class 'type', have 'exceptional' (error_mark) in useless_type_conversion_p, at gimple-expr.c:86 (error: invalid 'PHI' argument)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91162

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |9.1.1
   Target Milestone|9.2                         |7.5
            Summary|[9 Regression] ICE: tree    |[7/8 Regression] ICE: tree
                   |check: expected class       |check: expected class
                   |'type', have 'exceptional'  |'type', have 'exceptional'
                   |(error_mark) in             |(error_mark) in
                   |useless_type_conversion_p,  |useless_type_conversion_p,
                   |at gimple-expr.c:86 (error: |at gimple-expr.c:86 (error:
                   |invalid 'PHI' argument)     |invalid 'PHI' argument)

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Latent, so exploring further backport.