[Bug middle-end/68221] libgomp reduction-11/12 failures

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68221

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Index: gcc/tree-ssa-sccvn.c
===================================================================
--- gcc/tree-ssa-sccvn.c        (revision 230671)
+++ gcc/tree-ssa-sccvn.c        (working copy)
@@ -750,8 +750,11 @@ copy_reference_ops_from_ref (tree ref, v
        case MEM_REF:
          /* The base address gets its own vn_reference_op_s structure.  */
          temp.op0 = TREE_OPERAND (ref, 1);
-         if (tree_fits_shwi_p (TREE_OPERAND (ref, 1)))
-           temp.off = tree_to_shwi (TREE_OPERAND (ref, 1));
+           {
+             offset_int off = mem_ref_offset (ref);
+             if (wi::fits_shwi_p (off))
+               temp.off = off.to_shwi ();
+           }
          temp.clique = MR_DEPENDENCE_CLIQUE (ref);
          temp.base = MR_DEPENDENCE_BASE (ref);
          temp.reverse = REF_REVERSE_STORAGE_ORDER (ref);