[Bug middle-end/89779] [9 Regression] internal compiler error: tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in tree_nop_conversion_p, at tree.c:12798

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89779

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Mar 21 14:27:32 2019
New Revision: 269838

URL: https://gcc.gnu.org/viewcvs?rev=269838&root=gcc&view=rev
Log:
2019-03-21  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/89779
        * tree.c (tree_nop_conversion): Consolidate and fix defensive
        checks with respect to released SSA names now having error_mark_node
        type.
        * fold-const.c (operand_equal_p): Likewise.

        * gcc.dg/torture/pr89779.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr89779.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree.c