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Re: [Qemu-devel] [PATCH 2/2] tcg/i386: Reserve register for guest_base i

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH 2/2] tcg/i386: Reserve register for guest_base if a segment isn't available
Date: Fri, 17 Jul 2015 07:02:09 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.0.1

On 07/17/2015 02:33 AM, Peter Maydell wrote:
On 16 July 2015 at 22:25, Richard Henderson <address@hidden> wrote:
This saves 2 insns and 10 bytes from the implementation of
each memory operation.

Do we have an idea of which platforms/configs don't let
us have a segment register for guest_base?

We've only bothered to fill in code for Linux so far.

These days we should probably probe for fsgsbase insns and use those. Though I don't know how many of the various operating systems enable that...


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