Index: gcc/tree-ssa-forwprop.c
===================================================================
--- gcc/tree-ssa-forwprop.c	(revision 196158)
+++ gcc/tree-ssa-forwprop.c	(working copy)
@@ -1791,6 +1791,7 @@
 
   /* Try to fold (type) X op CST -> (type) (X op ((type-x) CST)).  */
   if (TREE_CODE (arg2) == INTEGER_CST
+      && !first_pass_instance
       && CONVERT_EXPR_CODE_P (def1_code)
       && INTEGRAL_TYPE_P (TREE_TYPE (def1_arg1))
       && int_fits_type_p (arg2, TREE_TYPE (def1_arg1)))
@@ -1814,6 +1815,7 @@
      binary operation result instead of to the operands.  This allows
      to combine successive conversions and bitwise binary operations.  */
   if (CONVERT_EXPR_CODE_P (def1_code)
+      && !first_pass_instance
       && CONVERT_EXPR_CODE_P (def2_code)
       && types_compatible_p (TREE_TYPE (def1_arg1), TREE_TYPE (def2_arg1))
       /* Make sure that the conversion widens the operands, or has same