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Re: [Qemu-devel] [PATCH] RFC: TCG constant propagation.
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] [PATCH] RFC: TCG constant propagation. |
Date: |
Thu, 23 Jul 2009 10:30:49 +0100 |
User-agent: |
KMail/1.11.4 (Linux/2.6.29-2-amd64; KDE/4.2.4; x86_64; ; ) |
On Thursday 23 July 2009, Laurent Desnogues wrote:
> On Thu, Jul 23, 2009 at 11:08 AM, Filip Navara<address@hidden>
wrote:
> > Also it looks that the actual code size is worse for TCG ARM target
> > with this optimization. To mitigate it I propose the other attached
> > patch which uses the barrel shifter for more optimal generation of the
> > "movi" operation. I can't test it, so any help is welcome.
>
> - the rotation amount is multiplied by 2 before being applied to the
> 8-bit immediate field.
This is compensated for by the later << 7
Paul