[Top][All Lists]

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

Re: [Qemu-devel] [PATCH 09/10] target/i386: optimize indirect branches w

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 09/10] target/i386: optimize indirect branches with TCG's jr op
Date: Wed, 12 Apr 2017 11:43:45 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 12/04/2017 09:17, Emilio G. Cota wrote:
> The fact that NBench is not very sensitive to changes here is a
> little surprising, especially given the significant improvements for
> ARM shown in the previous commit. I wonder whether the compiler is doing
> a better job compiling the x86_64 version (I'm using gcc 5.4.0), or I'm simply
> missing some i386 instructions to which the jr optimization should
> be applied.

Maybe it is "ret"?  That would be a straightforward "bx lr" on ARM, but
it is missing in your i386 patch.


reply via email to

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