* config/rs6000/rs6000.h (SLOW_UNALIGNED_ACCESS): Simplify.
* config/rs6000/rs6000.c (rs6000_emit_move): Use adjust_address
rather than simplify_subreg. Check for volatile-ness. Check that
we're not splitting one slow operation into two slow operations.
In gcc/testsuite/:
* gcc.c-torture/compile/structs.c: New testcase from GDB.
From-SVN: r47524
