The last ChangeLog of rtlopt-branch was written in 2003. After more than one year, many impovements in this branch haven't been put into the GCC HEAD. Why?
ÒýÑÔ Steven Bosscher <[EMAIL PROTECTED]>: > On Saturday 26 March 2005 02:22, Canqun Yang wrote: > > Â Â Â Â Â Â Â Â * loop.c (PREFETCH_BLOCKS> > _BEFORE_LOOP_MAX): Defined conditionally. > > Â Â Â Â Â Â Â Â (scan_loop): Change extra> > _size from 16 to 128. > > Â Â Â Â Â Â Â Â (emit_prefetch_instructio> > ns): Don't ignore all prefetches within > > loop. > > OK, so I know this is not a popular subject, but can we *please* stop > working on loop.c and focus on getting the new RTL and tree loop passes > to do what we want? All this loop.c patching is a typical example of > why free software development does not always work: always going for > the low-hanging fruit. In this case, there have been several attempts > to replace the prefetching stuff in loop.c with something better. On > the rtl-opt branch there is a new RTL loop- prefetch.c, and on the LNO > branch there is a re-use analysis based prefetching pass. Why don't > you try to finish and improve those passes, instead of making it yet > again harder to remove loop.c. This one file is a *huge* problem for > just about the entire RTL optimizer path. It is, for example, the > reason why there is no profile information available before this old > piece of, if I may say, junk runs, and it the only reason why a great > many functions in for example jump.c and the various cfg*.c files can > still not be removed. > > Gr. > Steven > > Canqun Yang Creative Compiler Research Group. National University of Defense Technology, China.
