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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/55124] [4.8 Regression] ICE in find_or_generate_expression, at tree-ssa-pre.c:2803
Date: Tue, 30 Oct 2012 15:50:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55124

vries at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu.org

--- Comment #5 from vries at gcc dot gnu.org 2012-10-30 15:49:42 UTC ---
tentative patch:
...
Index: gcc/tree-ssa-pre.c
===================================================================
--- gcc/tree-ssa-pre.c    (revision 192023)
+++ gcc/tree-ssa-pre.c    (working copy)
@@ -1657,6 +1657,16 @@ phi_translate_1 (pre_expr expr, bitmap_set_t set1,
         if (result)
           VEC_free (vn_reference_op_s, heap, newoperands);

+        if (result && TREE_CODE (result) == SSA_NAME)
+          {
+        gimple def_stmt = SSA_NAME_DEF_STMT (result);
+        basic_block def_bb = gimple_bb (def_stmt);
+        if (def_bb != pred
+            && !dominated_by_p (CDI_DOMINATORS, pred,
+                    def_bb))
+          return NULL;
+          }
+
         /* We can always insert constants, so if we have a partial
            redundant constant load of another type try to translate it
            to a constant of appropriate type.  */
...