[PATCH] IPA modref: fix miscompilation in clone when IPA modref is used

[Martin Liška]

Hello.

There's a tested Honza's patch for the 2 PRs related to SPEC benchmarks.
Patch can bootstrap on x86_64-linux-gnu and survives regression tests with
one exception:

FAIL: gcc.dg/lto/modref-1 c_lto_modref-1_0.o-c_lto_modref-1_1.o execute -O2 
-flto-partition=max -flto

It's a run-time test that tests:
  if (!__builtin_constant_p (z))
    __builtin_abort ();

I guess Honza can incrementally fix the test? I'm going to install the patch.

Thanks,
Martin

gcc/ChangeLog:

        PR ipa/97292
        PR ipa/97335
        * ipa-modref-tree.h (copy_from): Drop summary in a
        clone.
---
 gcc/ipa-modref-tree.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/ipa-modref-tree.h b/gcc/ipa-modref-tree.h
index b37280d18c7..8d7f2864793 100644
--- a/gcc/ipa-modref-tree.h
+++ b/gcc/ipa-modref-tree.h
@@ -496,7 +496,8 @@ struct GTY((user)) modref_tree
   /* Copy OTHER to THIS.  */
   void copy_from (modref_tree <T> *other)
   {
-    merge (other, NULL);
+    auto_vec <modref_parm_map, 32> parm_map;
+    merge (other, &parm_map);
   }
 
   /* Search BASE in tree; return NULL if failed.  */
--
2.28.0