------- Comment #7 from changpeng dot fang at amd dot com 2010-05-28 16:56 ------- (In reply to comment #5) > An alternative approach might be have different values for > prefetch-min-insn-to-mem-ratio and min-insn-to-prefetch-ratio > depending on constant/non-constant step size. > It may be a good idea for limit non-constant step prefetching to big loops. This is because we are not very confident that the reference will cause cache miss, and we should limit the prefetches generated. min-insn-to-prefetch-ratio may be a good parameter to work on.
By the way, I am thinking that min-insn-to-prefetch-ratio should be backend dependent. In certain sense, this parameter implies how many "useless" prefetches can an architecture tolerate. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44297
