[lkml]   [2003]   [Dec]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] optimize ia32 memmove
    On Tue, 2003-12-30 at 01:58, Linus Torvalds wrote:
    > But then anything that does the loads in ascending order is still ok, so
    > it shouldn't matter - by the time "dest" has been overwritten, the source
    > data has already been read. And all the "memcpy()" implementations had
    > better do that anyway, in order to get nice memory access patterns. "rep
    > movsl" certainly does.

    A PPC memcpy may end up clearing the destination before reading the
    source (using the cache-line zeroing instruction, to prevent the
    destination from being spuriously read to populate the cache line).


    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:59    [W:3.031 / U:0.888 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site