The non-trivial non-replicate swizzles on IADD.v4x8 and ISUB.v4x8 are
either documented wrong or broken in hardware. Instead of swizzling
b0101 and b2323, they swizzle b0011 and b2233 on G52. This is either a
hardware bug or an issue with documentation. In either case, it's
probably best not to trust it. Those swizzles aren't all that useful
anyway. We also weren't using any of them before (or they'd have
broken) so this isn't a performance regression.
Cc: mesa-stable
Reviewed-by: Lorenzo Rossi <lorenzo.rossi@collabora.com>
(cherry picked from commit 538b5c411e)
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40979>
ddf6c31b8e