Re: [Qemu-devel] [PULL 16/20] target/arm: Use vector infrastructure for aa64 compares

[Alex Bennée]

Emilio G. Cota <address@hidden> writes:

> On Wed, Feb 07, 2018 at 14:55:36 -0800, Richard Henderson wrote:
>> Reviewed-by: Alex Bennée <address@hidden>
>> Reviewed-by: Peter Maydell <address@hidden>
>> Signed-off-by: Richard Henderson <address@hidden>
>
> Just bisected a segfault for aarch64 nbench on a PowerPC host
> to this commit (79d61de6bdc398). I've also tested on x86_64 and
> aarch64 hosts, and these do not seem to be affected.

I wonder about other hosts without TCG_vec backend support (powerpc is
one)? I suspect it must be the fall-back for the vector expanders is
wrong.

>
> To reproduce:
> 1. grab this binary:
>   http://cs.columbia.edu/~cota/qemu/nbench-aarch64
> 2. run it on a PowerPC host with:
>   $ aarch64-linux-user/qemu-aarch64 nbench-aarch64 -V
>
> Note: the "-V" (or "-v") flag is important! Without it, there's no segfault.
>
> I can reproduce this consistently on a Power8 host -- I'm using gcc112
> from the gcc compile farm.
>
> Thanks,
>
>               Emilio


--
Alex Bennée