[U-Boot] [PATCH V2 0/3] make memcpy and memset faster

[Alessandro Rubini]

I've added 32-bit lcd to the Nomadik (not submitted yet), and I found
the scroll to be very slow, as the screen is big.

Instead of activating the "if 0" stanza for 32-bit scroll in lcd.c,
I'd better have a faster memcpy/memset globally. So this patch set
adds ulong-wide memcpy and memset, then removes the "#if 0" part in the
scroll function. For me scrolling is 4 times faster on a 32 bit system.

V2: I incorporated most of the comments, but I didn't change the for
loops to help the compiler optimizing it, since nowadays gcc is
already doing the loops his own way irrespective of what i write.

Similarly, I'm not interested in "4 bytes at a time, then 1 at a time"
as it's quite a corner case. If such optimizations are really useful,
then we'd better have hand-crafted assembly for each arch, possibly
lifted from glibc.

Alessandro Rubini (3):
  memcpy: copy one word at a time if possible
  memset: fill one word at a time if possible
  lcd: remove '#if 0' 32-bit scroll, now memcpy does it

 common/lcd.c         |   21 ---------------------
 lib_generic/string.c |   34 +++++++++++++++++++++++++++++-----
 2 files changed, 29 insertions(+), 26 deletions(-)