2008-04-11 H.J. Lu <hongjiu.lu@intel.com>
PR middle-end/35897
* dse.c (store_info): Change positions_needed to unsigned
HOST_WIDE_INT.
(lowpart_bitmask): New.
(record_store): Cast to unsigned HOST_WIDE_INT for
positions_needed. Assert width <= size of positions_needed *
CHAR_BIT. Call lowpart_bitmask to initialize positions_needed.
(check_mem_read_rtx): Use unsigned HOST_WIDE_INT on mask. Call
lowpart_bitmask to set mask.
From-SVN: r134199
