------- Comment #7 from irar at il dot ibm dot com 2006-09-19 07:29 ------- Even though vectorization of strided accesses is already implemented in the autovect branch (and will be committed to the mainline 4.3), this case contains a store with a gap (store to a[i] without a store to a[i-1]), and such stores are not supported (the current implementation supports only loads with gaps).
Note, however, that adding a store to a[i-1] will create a data dependence in the loop. Ira -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19049
