From: Dmitry Zhurikhin <zhur@ispras.ru>
To: Aurelien Jarno <aurelien@aurel32.net>
Cc: mj.mccormack@samsung.com, qemu-devel@nongnu.org,
Kirill Batuzov <batuzovk@ispras.ru>
Subject: Re: [Qemu-devel] [PATCH 0/6] Implement constant folding and copy propagation in TCG
Date: Sat, 21 May 2011 16:47:37 +0400 [thread overview]
Message-ID: <4DD7B469.1040802@ispras.ru> (raw)
In-Reply-To: <20110520193508.GB27170@hall.aurel32.net>
On 05/20/2011 11:35 PM, Aurelien Jarno wrote:
>
> On Fri, May 20, 2011 at 04:39:27PM +0400, Kirill Batuzov wrote:
>> This series implements some basic machine-independent optimizations. They
>> simplify code and allow liveness analysis do it's work better.
>>
>> Suppose we have following ARM code:
>>
>> movw r12, #0xb6db
>> movt r12, #0xdb6d
>>
>> In TCG before optimizations we'll have:
>>
>> movi_i32 tmp8,$0xb6db
>> mov_i32 r12,tmp8
>> mov_i32 tmp8,r12
>> ext16u_i32 tmp8,tmp8
>> movi_i32 tmp9,$0xdb6d0000
>> or_i32 tmp8,tmp8,tmp9
>> mov_i32 r12,tmp8
>>
>> And after optimizations we'll have this:
>>
>> movi_i32 r12,$0xdb6db6db
>>
>> Here are performance evaluation results on SPEC CPU2000 integer tests in
>> user-mode emulation on x86_64 host. There were 5 runs of each test on
>> reference data set. The tables below show runtime in seconds for all these
>> runs.
>
> How are the tests done? Are they done with linux-user, or running the
> executables in qemu-system-xxx?
They were run in user mode on a dedicated machine not doing anything
else. We found system emulation to be too volatile for measuring
anything. Anyway even with user mode and on a dedicated machine there
are some weird performance jumps we can't explain but overall SPEC seems
stable enough to notice influence of such changes in code generation.
>
>> ...
Dmitry
next prev parent reply other threads:[~2011-05-21 12:47 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-20 12:39 [Qemu-devel] [PATCH 0/6] Implement constant folding and copy propagation in TCG Kirill Batuzov
2011-05-20 12:39 ` [Qemu-devel] [PATCH 1/6] Add TCG optimizations stub Kirill Batuzov
2011-05-20 18:12 ` Richard Henderson
2011-05-20 18:33 ` Richard Henderson
2011-05-20 12:39 ` [Qemu-devel] [PATCH 2/6] Add copy and constant propagation Kirill Batuzov
2011-05-20 18:22 ` Richard Henderson
2011-05-20 18:46 ` Paolo Bonzini
2011-05-20 19:41 ` Aurelien Jarno
2011-05-20 12:39 ` [Qemu-devel] [PATCH 3/6] Do constant folding for basic arithmetic operations Kirill Batuzov
2011-05-20 12:39 ` [Qemu-devel] [PATCH 4/6] Do constant folding for boolean operations Kirill Batuzov
2011-05-20 18:45 ` Richard Henderson
2011-05-20 12:39 ` [Qemu-devel] [PATCH 5/6] Do constant folding for shift operations Kirill Batuzov
2011-05-20 18:37 ` Richard Henderson
2011-05-26 12:36 ` Kirill Batuzov
2011-05-26 13:56 ` Richard Henderson
2011-05-26 19:14 ` Blue Swirl
2011-05-26 20:10 ` Richard Henderson
2011-05-26 20:25 ` Blue Swirl
2011-05-26 21:14 ` Richard Henderson
2011-05-27 15:41 ` Jamie Lokier
2011-05-27 17:07 ` Blue Swirl
2011-05-27 19:54 ` Richard Henderson
2011-05-27 7:09 ` Paolo Bonzini
2011-05-20 12:39 ` [Qemu-devel] [PATCH 6/6] Do constant folding for unary operations Kirill Batuzov
2011-05-20 18:39 ` Richard Henderson
2011-05-20 17:50 ` [Qemu-devel] [PATCH 0/6] Implement constant folding and copy propagation in TCG Richard Henderson
2011-05-20 19:37 ` Aurelien Jarno
2011-05-20 23:31 ` Andreas Färber
2011-05-21 9:37 ` Laurent Desnogues
2011-05-21 10:46 ` Aurelien Jarno
2011-05-21 17:53 ` Kirill Batuzov
2011-05-20 19:35 ` Aurelien Jarno
2011-05-21 12:47 ` Dmitry Zhurikhin [this message]
2011-05-21 12:48 ` Aurelien Jarno
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