[Bug tree-optimization/65802] [6 Regression] ICE in redirect_eh_edge_1, at tree-eh.c:2335

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65802

--- Comment #8 from vries at gcc dot gnu.org ---
(In reply to Richard Biener from comment #7)
> (In reply to vries from comment #6)
> > (In reply to vries from comment #5)
> > > So the question is: should ifn_va_arg have ECF_NOTHROW?
> > 
> > Adding ECF_NOTHROW to ifn_va_arg also fixes the ICE.
> > 
> > And at gimplify_va_arg_expr, the VA_ARG_EXPR tree is non-throwing:
> 
> Is that always the case (try -fnon-call-exceptions)?  Then doing that looks
> obvious.
> 
> Richard.
> 

Yep, that's also the case with -fnon-call-exceptions:
...
(gdb) call debug_generic_expr (*expr_p)
VA_ARG_EXPR <c>
(gdb) call tree_could_throw_p (*expr_p )
$1 = false
(gdb) p flag_non_call_exceptions
$2 = 1
...