* tree-ssa-dse.c (live_bytes_read): Fix thinko.

From-SVN: r253792

gcc/ChangeLog

+2017-10-16  Jeff Law  <law@redhat.com>
+
+	* tree-ssa-dse.c (live_bytes_read): Fix thinko.
+
 2017-10-16  Jan Hubicka  <hubicka@ucw.cz>
 
 	* x86-tune-costs.h (znver1_cost): Fix move cost tables.

gcc/tree-ssa-dse.c

@@ -493,7 +493,7 @@ live_bytes_read (ao_ref use_ref, ao_ref *ref, sbitmap live)
 
       /* Now check if any of the remaining bits in use_ref are set in LIVE.  */
       unsigned int start = (use_ref.offset - ref->offset) / BITS_PER_UNIT;
-      unsigned int end  = ((use_ref.offset + use_ref.size) / BITS_PER_UNIT) - 1;
+      unsigned int end = start + (use_ref.size / BITS_PER_UNIT) - 1;
       return bitmap_bit_in_range_p (live, start, end);
     }
   return true;