On 07/31, Arnd Bergmann wrote:
=== iWMMXt ===
I'm not aware of any remaining users for iWMMXt, and we dropped
support for ARMv7 PJ4 CPUs (MMP2, Berlin) already, so the
only supported hardware that even has this is Intel/Marvell
PXA and MMP1.
pixman had [1][2] iwMMXt paths that I optimized for the XO 1.75 and
would occasionally test on a CuBox over the years.
I'm surprised to see that commit b9920fdd5a75 ("ARM: 9352/1: iwmmxt:
Remove support for PJ4/PJ4B cores") landed with the claim that "there is
no v6/v7 user space that actually makes use of this". A quick Google
search reveals evidence of usage [3]. It doesn't seem like this should
have been backported to the stable branches in any case.
I know that ffmpeg used to have iwMMXt paths as well, but I believe they
were removed a few years ago.
Anyway, I guess it's totally dead now.
[1] https://gitlab.freedesktop.org/pixman/pixman/-/merge_requests/108
[2] https://mattst88.com/blog/2012/07/06/My_time_optimizing_graphics_performance_on_the_OLPC_XO_1.75_laptop/
[3] https://www.phoronix.com/news/MTEzNDQ
