[gcc(refs/users/pheeck/heads/sccp)] ipa-cp: Do not consider useless aggregate constants

[gcc(refs/users/pheeck/heads/sccp)] ipa-cp: Do not consider useless aggregate constants

[Filip Kastl]

https://gcc.gnu.org/g:bc67858c5c9b43038922fe3b675c2f80141f2426

commit bc67858c5c9b43038922fe3b675c2f80141f2426
Author: Martin Jambor <mjambor@suse.cz>
Date:   Tue Nov 22 18:22:03 2022 +0100

    ipa-cp: Do not consider useless aggregate constants
    
    When building vectors of known aggregate values, there is no point in
    including those for parameters which are not used in any way
    whatsoever.  This patch avoids that together with also other kinds of
    constants.
    
    gcc/ChangeLog:
    
    2022-11-13  Martin Jambor  <mjambor@suse.cz>
    
            * ipa-cp.cc (push_agg_values_from_edge): Do not consider constants
            in unused aggregate parameters.

Diff:
---
 gcc/ipa-cp.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gcc/ipa-cp.cc b/gcc/ipa-cp.cc
index f0feb4beb8f..d5230c7c5e6 100644
--- a/gcc/ipa-cp.cc
+++ b/gcc/ipa-cp.cc
@@ -5785,7 +5785,8 @@ push_agg_values_from_edge (struct cgraph_edge *cs,
 	}
 
       ipcp_param_lattices *plats = ipa_get_parm_lattices (dest_info, index);
-      if (plats->aggs_bottom)
+      if (!ipa_is_param_used (dest_info, index)
+	  || plats->aggs_bottom)
 	continue;
       push_agg_values_for_index_from_edge (cs, index, res,
 					   optimize_self_recursion ? interim
@@ -6151,6 +6152,9 @@ decide_whether_version_node (struct cgraph_node *node)
 
   for (i = 0; i < count;i++)
     {
+      if (!ipa_is_param_used (info, i))
+	continue;
+
       class ipcp_param_lattices *plats = ipa_get_parm_lattices (info, i);
       ipcp_lattice<tree> *lat = &plats->itself;
       ipcp_lattice<ipa_polymorphic_call_context> *ctxlat = &plats->ctxlat;