Change #275112

Comments

swscale/uops: add SWS_UOP_RW_SHUFFLE
This directly encodes the "pshufb" loop style processing seen in the x86
backend (and, presumably, other backends down the line). The major
advantage of encoding this as a separate UOP is that it allows the macro
generator to exhaustively enumerate all needed variants of the read/write
chunk sizes, which so-far have been hand-maintained through trial and error.

I decided to also go ahead and pre-emptively generalize the clear
value to allow us to encode RGBA clears in addition to RGB0 clears,
which makes this UOP useful for e.g. Gray -> RGBA32 as well; something
that the current pshufb loop did not handle.

This commit merely adds the UOP defition; it does not yet port
the packed shuffle solver or x86 implementation.

Signed-off-by: Niklas Haas <git@haasn.dev>

Changed files

• libswscale/uops.c
• libswscale/uops.h
• libswscale/uops_list.h
• libswscale/uops_macros.h
• libswscale/uops_macros_gen.c