https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102720
--- Comment #11 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Aha, the problem is in the way I updated computing use/clobber sets. I
accidentally disabled code that copies the solution from solver local
representation into the final form. As a result we failed to update the call
uses while doing the late alias pass and ended up with stale decl from first
run.
Honza
diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c
index 6f12a66ee0d..ebb4ea78674 100644
--- a/gcc/tree-ssa-structalias.c
+++ b/gcc/tree-ssa-structalias.c
@@ -379,7 +379,7 @@ new_var_info (tree t, const char *name, bool add_id)
if (dump_file && add_id)
{
- char *tempname = xasprintf ("%s(%d)", name, index);
+ char *tempname = xasprintf ("%s(%d,%d)", name, index, t?DECL_UID
(t):-1);
name = ggc_strdup (tempname);
free (tempname);
}
@@ -7541,17 +7541,18 @@ compute_points_to_sets (void)
determine_global_memory_access (stmt, NULL,
&reads_global_memory,
&uses_global_memory);
- if (!uses_global_memory)
- ;
- else if ((vi = lookup_call_use_vi (stmt)) != NULL)
+ if ((vi = lookup_call_use_vi (stmt)) != NULL)
{
*pt = find_what_var_points_to (cfun->decl, vi);
/* Escaped (and thus nonlocal) variables are always
implicitly used by calls. */
/* ??? ESCAPED can be empty even though NONLOCAL
always escaped. */
- pt->nonlocal = uses_global_memory;
- pt->escaped = uses_global_memory;
+ if (uses_global_memory)
+ {
+ pt->nonlocal = uses_global_memory;
+ pt->escaped = uses_global_memory;
+ }
}
else if (uses_global_memory)
{
@@ -7572,17 +7573,18 @@ compute_points_to_sets (void)
determine_global_memory_access (stmt, &writes_global_memory,
NULL, NULL);
- if (!writes_global_memory)
- ;
- else if ((vi = lookup_call_clobber_vi (stmt)) != NULL)
+ if ((vi = lookup_call_clobber_vi (stmt)) != NULL)
{
*pt = find_what_var_points_to (cfun->decl, vi);
/* Escaped (and thus nonlocal) variables are always
implicitly clobbered by calls. */
/* ??? ESCAPED can be empty even though NONLOCAL
always escaped. */
- pt->nonlocal = writes_global_memory;
- pt->escaped = writes_global_memory;
+ if (writes_global_memory)
+ {
+ pt->nonlocal = writes_global_memory;
+ pt->escaped = writes_global_memory;
+ }
}
else if (writes_global_memory)
{
