From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org, a_mulyadi@softhome.net
Subject: Re: [Qemu-devel] mini documentation of "info registers" output
Date: Fri, 1 Jul 2005 13:17:43 +0100 [thread overview]
Message-ID: <200507011317.43863.paul@codesourcery.com> (raw)
In-Reply-To: <200507011133.49905.a_mulyadi@softhome.net>
On Friday 01 July 2005 05:33, Mulyadi Santosa wrote:
> Dear list
>
> Here is a little cheat sheet for you to better understand what "info
> registers" shows on qemu's monitor. This infomations are strictly for
> x86
> CCS : Compiled Code Source (?)
Condition Code Source.
> CCD : Compiled Code Destination (?)
Condition Code Source.
> CCO : (?) instruction name
Condition Code Operation
These 3 are used to implement lazy flag evaluation. Most x86 instructions set
the condition code flags, but only a relatively small subset of instructions
actually use these flags.
Calculating the flags at every operation would be very slow. Instead qemu just
remembers the destination, one source operand and the instruction class of a
flag setting operation, then lazily evaluates the flags as needed.
Paul
next prev parent reply other threads:[~2005-07-01 12:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-01 4:33 [Qemu-devel] mini documentation of "info registers" output Mulyadi Santosa
2005-07-01 12:17 ` Paul Brook [this message]
2005-07-02 4:12 ` Mulyadi Santosa
2005-07-02 7:18 ` Gwenole Beauchesne
2005-07-02 15:08 ` Paul Brook
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