[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-ppc] [Qemu-devel] [RFC PATCH 0/6] target/ppc: convert VMX inst

From: Mark Cave-Ayland
Subject: Re: [Qemu-ppc] [Qemu-devel] [RFC PATCH 0/6] target/ppc: convert VMX instructions to use TCG vector operations
Date: Tue, 11 Dec 2018 19:11:08 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0

On 10/12/2018 13:04, Aleksandar Markovic wrote:

> On Dec 7, 2018 9:59 AM, "Mark Cave-Ayland" <address@hidden>
> wrote:
>> This patchset is an attempt at trying to improve the VMX (Altivec)
> instruction
>> performance by making use of the new TCG vector operations where possible.
> Hello, Mark.
> I just want to say that I support these efforts. Very interesting, it can
> bring significant improvements for multimedia intensive emulations. But,
> even more important, we can see new tcg vector interface in action,
> possibly suggest improvements, extensions.
> I would just like to ask you to add some performance comparisons, if
> possible. Very simple tests would be sufficient.
> Thanks again for this series!

Thanks Aleksander! In my local tests I haven't done much in the way of 
other than to check the output of the disassembler to confirm that the x86 
opcodes are being used. Given that only a small number of TCG vector operations 
currently suitable for use with the VMX code, then I would expect certain 
benchmarks to show improvements e.g. with the logical ops but there was 
nothing noticeable in normal usage with my OpenBIOS test images.

I agree with you that having a second implementation other than ARM will help 
ideas as to how the vector interfaces can be evolved to support more operations 



reply via email to

[Prev in Thread] Current Thread [Next in Thread]