[Bug tree-optimization/86489] ICE in gimple_phi_arg starting with r261682 when building 531.deepsjeng_r with FDO + LTO

[pthaugen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86489

--- Comment #5 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
(In reply to kugan from comment #3)
> index f6fa2f7..fbdf838 100644
> --- a/gcc/tree-ssa-loop-niter.c
> +++ b/gcc/tree-ssa-loop-niter.c
> @@ -2555,6 +2555,7 @@ number_of_iterations_popcount (loop_p loop, edge exit,
>     ... = PHI <b_5(2), b_6(3)>.  */
>    gimple *phi = SSA_NAME_DEF_STMT (b_11);
>    if (gimple_code (phi) != GIMPLE_PHI
> +      || (gimple_bb (phi) != loop_latch_edge (loop)->dest)
>        || (gimple_assign_lhs (and_stmt)
>           != gimple_phi_arg_def (phi, loop_latch_edge (loop)->dest_idx)))
>      return false;

This fixes the problem for me.