------- Comment #5 from tsv at solvo dot ru 2005-10-14 13:30 ------- I tried check the difference between 3.4 and 4.x. The 3.4 emit instruction that correct passed pointer (in my case -25) and then stores value to member of structure (p4) at correct offset (24). In gcc 4.x the "store_field" is called with target rtx defined as "MEM plus const_int -25", but in gcc 3.4 - just MEM. The "store_bit_field" adds member offset to target rtx and it became "MEM plus const_int -1". Later on "get_aligned_mem" in alpha.c tries to convert it to "load long", but at that point it thinks that MEM is aligned (which is not true). Unfortunatelly, I don't have deep knowledge of gcc :) and could not figure out what is correct place for check of alignment restrictions for such cases: expand_assignment, store_field or store_bit_field functions. All of them seems to have alignemnt check logic.
Thank you. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24178
