On 2014-03-06 11:40:47 +0000, Alex Bennée wrote: > > Janne Grunau <j...@jannau.net> writes: > > > On 2014-02-25 15:54:37 +0000, Alex Bennée wrote: > >> > <snip> > >> Have you got the log file "unsupported" line? I seem to recall you did > >> ping me but maybe it was just on IRC? I just want to make sure I > >> do the right ones. I'm working on this now. > > > > We spoke on irc about it. a quick test commenting unsupported > > instructions out revealed that rshrn/2, sqrshrun and shrn/2 are > > the only NEON instructions used in libav still missing support > > in qemu master. Unsoppurted lines from qemu master 0459650d94d1 > > below. > > > > target-arm/translate-a64.c:6884: unsupported instruction encoding > > 0x0f0a8e10 at pc=00000000008632c8 > > target-arm/translate-a64.c:6884: unsupported instruction encoding > > 0x2f0b8f9c at pc=0000000000865764 > > target-arm/translate-a64.c:6884: unsupported instruction encoding > > 0x0f0a8610 at pc=0000000000863afc > > I've just pushed support for the various shrn opcodes to: > > https://github.com/stsquad/qemu/tree/ajb-a64-working
Thanks, just testing it and it seems to work as expected. > I suspect if libav uses them heavily there could be some optimisation > to be made as the narrow operations make heavy use of helpers to do the > saturation stuff. The saturating shift is not that heavily used and I don't care much as long as qemu is an order of magnitude faster than ARM's foundation model and much easier to handle than Apple hardware. Janne
