Re: [Qemu-devel] Call for testing QEMU aarch64-linux-user emulation

[Alex Bennée]

Janne Grunau <address@hidden> 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

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.

-- 
Alex Bennée