[Top][All Lists]

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

Re: [Qemu-ppc] [Qemu-devel] [PATCH] target-ppc: optimize cmp translation

From: Richard Henderson
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH] target-ppc: optimize cmp translation
Date: Mon, 18 Dec 2017 11:01:02 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0

On 12/16/2017 09:49 PM, Paolo Bonzini wrote:
> We know that only one bit (in addition to SO) is going to be set in
> the condition register, so do two movconds instead of three setconds,
> three shifts and two ORs.
> For ppc64-linux-user, the code size reduction is around 5% and the
> performance improvement slightly less than 10%.  For softmmu, the
> improvement is around 5%.
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
>  target/ppc/translate.c | 29 ++++++++++++-----------------
>  1 file changed, 12 insertions(+), 17 deletions(-)

Reviewed-by: Richard Henderson <address@hidden>


reply via email to

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