From: Richard Henderson <rth@twiddle.net>
To: Laurent Desnogues <laurent.desnogues@gmail.com>
Cc: Paul Brook <paul@codesourcery.com>,
aurelien@aurel32.net, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 0/5] tcg conditional set, round 4
Date: Mon, 21 Dec 2009 14:50:11 -0800 [thread overview]
Message-ID: <4B2FFBA3.4060601@twiddle.net> (raw)
In-Reply-To: <761ea48b0912211421y2e213dc0gfed24835f3b7f658@mail.gmail.com>
On 12/21/2009 02:21 PM, Laurent Desnogues wrote:
> As far as I know these CPU's don't need the full movcond but
> only the variant with vtrue.
I know that. And I looked into TCG very closely to figure out how to
implement just that. Except then I have to modify TCG to special-case
movcond to know that DEST is both input and output. This is *much* more
work than simply having the back-end use a matching constraint on VFALSE.
> Even if movcond was quick to generate
> host code, for instance for ARM, you'd have to explicitly detect
> conditional moves
One of us is confused. Why would I have to explicitly detect
conditional moves?
r~
next prev parent reply other threads:[~2009-12-21 23:31 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-19 18:52 [Qemu-devel] [PATCH 0/5] tcg conditional set, round 4 Richard Henderson
2009-12-19 16:50 ` [Qemu-devel] [PATCH 2/5] tcg-x86_64: Implement setcond Richard Henderson
2009-12-19 23:11 ` Aurelien Jarno
2009-12-19 18:01 ` [Qemu-devel] [PATCH 1/5] tcg: Generic support for conditional set Richard Henderson
2009-12-19 23:11 ` Aurelien Jarno
2009-12-19 23:24 ` Richard Henderson
2009-12-19 23:45 ` Aurelien Jarno
2009-12-22 11:27 ` Laurent Desnogues
2009-12-22 16:09 ` Richard Henderson
2009-12-19 18:44 ` [Qemu-devel] [PATCH 3/5] tcg-i386: Implement small forward branches Richard Henderson
2009-12-19 23:11 ` Aurelien Jarno
2009-12-19 23:32 ` Laurent Desnogues
2009-12-20 1:17 ` Richard Henderson
2009-12-19 18:44 ` [Qemu-devel] [PATCH 4/5] tcg: Add tcg_invert_cond Richard Henderson
2009-12-19 23:11 ` Aurelien Jarno
2009-12-19 18:46 ` [Qemu-devel] [PATCH 5/5] tcg-i386: Implement setcond Richard Henderson
2009-12-19 23:11 ` Aurelien Jarno
2009-12-22 12:20 ` Laurent Desnogues
2009-12-19 23:11 ` [Qemu-devel] [PATCH 0/5] tcg conditional set, round 4 Aurelien Jarno
2009-12-19 23:43 ` malc
2009-12-20 11:03 ` Blue Swirl
2009-12-20 22:57 ` Paul Brook
2009-12-21 2:00 ` Richard Henderson
2009-12-21 9:13 ` Laurent Desnogues
2009-12-21 9:47 ` [Qemu-devel] " Paolo Bonzini
2009-12-21 10:03 ` Laurent Desnogues
2009-12-21 20:28 ` [Qemu-devel] " Richard Henderson
2009-12-21 22:21 ` Laurent Desnogues
2009-12-21 22:50 ` Richard Henderson [this message]
2009-12-21 23:08 ` Laurent Desnogues
2009-12-22 0:02 ` Richard Henderson
2009-12-22 14:46 ` Laurent Desnogues
2009-12-22 7:19 ` Aurelien Jarno
2009-12-21 10:08 ` Aurelien Jarno
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