a0f6a8cb41
Besides simple pass-through (aggregate) jump function, arithmetic (aggregate)
jump function could also bring same (aggregate) value as parameter passed-in
for self-feeding recursive call. For example,
f1 (int i) /* normal jump function */
{
f1 (i & 1);
}
Suppose i is 0, recursive propagation via (i & 1) also gets 0, which
can be seen as a simple pass-through of i.
f2 (int *p) /* aggregate jump function */
{
int t = *p & 1;
f2 (&t);
}
Likewise, if *p is 0, (*p & 1) is also 0, and &t is an aggregate simple
pass-through of p.
2020-02-10 Feng Xue <fxue@os.amperecomputing.com>
PR ipa/93203
* ipa-cp.c (ipcp_lattice::add_value): Add source with same call edge
but different source value.
(adjust_callers_for_value_intersection): New function.
(gather_edges_for_value): Adjust order of callers to let a
non-self-recursive caller be the first element.
(self_recursive_pass_through_p): Add a new parameter "simple", and
check generalized self-recursive pass-through jump function.
(self_recursive_agg_pass_through_p): Likewise.
(find_more_scalar_values_for_callers_subset): Compute value from
pass-through jump function for self-recursive.
(intersect_with_plats): Cleanup previous implementation code for value
itersection with self-recursive call edge.
(intersect_with_agg_replacements): Likewise.
(intersect_aggregates_with_edge): Deduce value from pass-through jump
function for self-recursive call edge. Cleanup previous implementation
code for value intersection with self-recursive call edge.
(decide_whether_version_node): Remove dead callers and adjust order
to let a non-self-recursive caller be the first element.
PR ipa/93203
* g++.dg/ipa/pr93203.C: New test.
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