The MMX and early SSE PSHUF* instructions were annotated SM0-1, which
is unnecessary (no ambiguity) but broke the tighter SM matching the
assembler now uses.
This is almost certainly underspecified now, but the MMX and early SSE
instruction patterns need to be tidied up anyway, and this is the
least impactful change that seems to fix the problem.
This unbreaks compiling ffmpeg.
Reported-by: Yongjie Sheng (Intel) <sheng.yongjie@outlook.com>
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
