[Bug hsa/70857] [6/7 Regression] ICE with -fopenmp -fopenacc in insert_vi_for_tree, at tree-ssa-structalias.c:2813

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70857

--- Comment #4 from Martin Jambor <jamborm at gcc dot gnu.org> ---
This bug is a consequence of false sharing of a RESULT_DECL between
the CPU-intended OpenMP outlined function and the HSA-intended
outlined (kernel) one.  How come -fopenacc is necessary to trigger it,
I don't know but the following patch fixes it.  I need to bring my
various branches up to speed for proper testing before I send it to
the mailing list.

diff --git a/gcc/omp-low.c b/gcc/omp-low.c
index c9600fb..a11f44b 100644
--- a/gcc/omp-low.c
+++ b/gcc/omp-low.c
@@ -13681,6 +13681,9 @@ grid_expand_target_grid_body (struct omp_region
*target)
   tree new_parm_decl = copy_node (DECL_ARGUMENTS (kern_fndecl));
   DECL_CONTEXT (new_parm_decl) = kern_fndecl;
   DECL_ARGUMENTS (kern_fndecl) = new_parm_decl;
+  gcc_assert (VOID_TYPE_P (TREE_TYPE (DECL_RESULT (kern_fndecl))));
+  DECL_RESULT (kern_fndecl) = copy_node (DECL_RESULT (kern_fndecl));
+  DECL_CONTEXT (DECL_RESULT (kern_fndecl)) = kern_fndecl;
   struct function *kern_cfun = DECL_STRUCT_FUNCTION (kern_fndecl);
   kern_cfun->curr_properties = cfun->curr_properties;