[Bug middle-end/52890] Revision 185336 causes 10% degradation on cpu2000 benchmark 252.eon

[jamborm at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52890

--- Comment #5 from Martin Jambor <jamborm at gcc dot gnu.org> 2012-04-11 
15:53:44 UTC ---
But when I add the following line to the patch linked above, the
problem goes away:

Index: src/gcc/tree-sra.c
===================================================================
--- src.orig/gcc/tree-sra.c
+++ src/gcc/tree-sra.c
@@ -1455,6 +1455,7 @@ build_ref_for_offset (location_t loc, tr
     }
   else if (TREE_CODE (base) == MEM_REF)
     {
+      prev_base = base;
       off = build_int_cst (TREE_TYPE (TREE_OPERAND (base, 1)),
                           base_offset + offset / BITS_PER_UNIT);
       off = int_const_binop (PLUS_EXPR, TREE_OPERAND (base, 1), off);