Hi,
On Sun, Sep 19, 2010 at 9:40 PM, Michael Hope wrote:
[...]
>>> I've just modified this to build different variants as well. ffmpeg
>>> now builds as supplied (-O2 and others), with -Os, with hand-written
>>> assembler turned off, and with -mfpu=neon. corebench builds in -O2
>>> and -Os.
On Sat, Sep 18, 2010 at 3:00 AM, Dave Martin wrote:
> Hi,
>
> On Fri, Sep 17, 2010 at 3:50 AM, Michael Hope wrote:
>> It's only part of the puzzle, but I run speed benchmarks as part of
>> the continious build:
>> http://ex.seabright.co.nz/helpers/buildlog
>> http://ex.seabright.co.nz/helpers/b
Hi,
On Fri, Sep 17, 2010 at 3:50 AM, Michael Hope wrote:
> It's only part of the puzzle, but I run speed benchmarks as part of
> the continious build:
> http://ex.seabright.co.nz/helpers/buildlog
> http://ex.seabright.co.nz/helpers/benchcompare
> http://ex.seabright.co.nz/build/gcc-linaro-4.5-
Richard Earnshaw wrote:
>>> I've just modified this to build different variants as well. ffmpeg
>>> now builds as supplied (-O2 and others), with -Os, with hand-written
>>> assembler turned off, and with -mfpu=neon. corebench builds in -O2
>>> and -Os.
>> Here are some options we may have to use
On Fri, 2010-09-17 at 18:21 +0800, Yao Qi wrote:
> Michael Hope wrote:
> > It's only part of the puzzle, but I run speed benchmarks as part of
> > the continious build:
> > http://ex.seabright.co.nz/helpers/buildlog
> > http://ex.seabright.co.nz/helpers/benchcompare
> >
> > http://ex.seabright
Michael Hope wrote:
> It's only part of the puzzle, but I run speed benchmarks as part of
> the continious build:
> http://ex.seabright.co.nz/helpers/buildlog
> http://ex.seabright.co.nz/helpers/benchcompare
>
> http://ex.seabright.co.nz/build/gcc-linaro-4.5-2010.09-1/logs/armv7l-maverick-cbuil
It's only part of the puzzle, but I run speed benchmarks as part of
the continious build:
http://ex.seabright.co.nz/helpers/buildlog
http://ex.seabright.co.nz/helpers/benchcompare
http://ex.seabright.co.nz/build/gcc-linaro-4.5-2010.09-1/logs/armv7l-maverick-cbuild4-pavo4/pybench-test.txt
I've
It would be interesting if we could get a good, representative set of
comparative benchmarks for the size and performance impact of -Os.
I did a bit of investigation here:
https://wiki.linaro.org/Platform/Foundations/OptimiseForSize
(though with just a few packages and only one benchmark, it's n
On Tue, 2010-09-07 at 12:24 +0100, Julian Brown wrote:
> On Tue, 7 Sep 2010 12:55:59 +0200
> Loïc Minier wrote:
>
> > On Tue, Sep 07, 2010, Julian Brown wrote:
> > > Do
> > > you still have the code fragment handy (I don't rem
On Tue, 2010-09-07 at 13:09 +0100, Andrew Stubbs wrote:
> On 07/09/10 13:01, Yao Qi wrote:
> >> * Investigate reduced alignment constraints?
> >
> > Any details on this?
>
> No, I just know that some targets like to align functions to
> cache-lines. This is a useful speed optimization, but does
On 9/10/2010 2:17 AM, Dave Martin wrote:
> (int)((unsigned)c << 28) >> 28
>
> is invalid C, because the result of the unsigned->signed cast (needed
> to get arithmetic right shift) is undefined if the argument is >
> INT_MAX.
True, but undefined-ness (or, in this case, implementation-defined-ne
On Fri, Sep 10, 2010 at 2:14 AM, Nicolas Pitre wrote:
[...]
> lsl r0, r0, #28
> asr r0, r0, #28
> bx lr
>
> But I doubt gcc could ever become that smart.
Some pointed out to me that the tempting C equivalent
(int)((unsigned)c << 28) >>
On Thu, 9 Sep 2010, Andrew Stubbs wrote:
> On 09/09/10 16:22, Yao Qi wrote:
> > GCC produces code like this,
> > 0024:
> >24: f000 000f and.w r0, r0, #15
> >28: 2807cmp r0, #7
> >2a: d901bls.n 30
> >2c: 3810subsr0, #
On 09/09/10 16:22, Yao Qi wrote:
> GCC produces code like this,
> 0024:
>24: f000 000f and.w r0, r0, #15
>28: 2807cmp r0, #7
>2a: d901bls.n 30
>2c: 3810subsr0, #16
>2e: b280uxthr0, r0<--[1]
>
Yao Qi wrote:
> Hi,
> We are looking for some possible improvements and optimizations on
> thumb2 code size. Currently, I am running some benchmarks with
> compilation flag "-Os -march=armv7-a -mthumb", and hope to find some
> thing interesting that we can improve. Beside that, do you have some
>
Chung-Lin Tang wrote:
> This reminds me of a PR that Bernd did:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40657
>
> It is also support for adding the r0-r3 registers to the
> epilogue/prologue push-pop for sake of reducing code size, though in a
> sense even more aggressive; it tries to merge
This reminds me of a PR that Bernd did:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40657
It is also support for adding the r0-r3 registers to the
epilogue/prologue push-pop for sake of reducing code size, though in a
sense even more aggressive; it tries to merge the local stack allocation
SP s
On Tue, 07 Sep 2010 21:06:10 +0800
Yao Qi wrote:
> Julian Brown wrote:
> > So yeah, I think there is indeed a possible improvement here (and we
> > don't even need to break the EABI, I don't think). Unless I've
> > overlooked something, anyway...
> Julian,
> I revert back the first example, and a
Loïc Minier wrote:
> I see you moved the wiki page to the public space, thanks
>
> Couple of notes:
> * make sure you use the rename action on the page, I think this will
>preserver history (I didn't check whether you did or not, but I think
>not)
No, I didn't. I use copy and paste.
Julian Brown wrote:
> On Tue, 7 Sep 2010 12:55:59 +0200
> Loïc Minier wrote:
>
>> On Tue, Sep 07, 2010, Julian Brown wrote:
>>> Do
>>> you still have the code fragment handy (I don't remember exactly how
>>> it went)?
>> You c
On 07/09/10 13:01, Yao Qi wrote:
>> * Investigate reduced alignment constraints?
>
> Any details on this?
No, I just know that some targets like to align functions to
cache-lines. This is a useful speed optimization, but does lead to lots
of "blank" gaps in the code. I have no real idea if ARM d
Andrew Stubbs wrote:
> On 06/09/10 07:16, Yao Qi wrote:
>> I've put some ideas in this wiki page,
>> https://wiki.linaro.org/Internal/People/YaoQi/Thumb2Optimize
>
> We probably shouldn't post Internal links to this public list. Is there
> any reason this can't be done in the open?
I've moved thi
On Tue, 7 Sep 2010 12:55:59 +0200
Loïc Minier wrote:
> On Tue, Sep 07, 2010, Julian Brown wrote:
> > Do
> > you still have the code fragment handy (I don't remember exactly how
> > it went)?
>
> You can extract it from the wi
On Tue, Sep 07, 2010, Julian Brown wrote:
> Do
> you still have the code fragment handy (I don't remember exactly how
> it went)?
You can extract it from the wiki history with the "Info" action on the
page and then diffing rev
On Mon, 06 Sep 2010 14:16:25 +0800
Yao Qi wrote:
> Yao Qi wrote:
> > Hi,
> > We are looking for some possible improvements and optimizations on
> > thumb2 code size. Currently, I am running some benchmarks with
> > compilation flag "-Os -march=armv7-a -mthumb", and hope to find some
> > thing in
On 06/09/10 07:16, Yao Qi wrote:
> I've put some ideas in this wiki page,
> https://wiki.linaro.org/Internal/People/YaoQi/Thumb2Optimize
We probably shouldn't post Internal links to this public list. Is there
any reason this can't be done in the open?
Now for the page content
I think you s
Nicolas Pitre wrote:
>
>
> Your remark for the first example is wrong. GCC has to store r8 (or any
> other register for that matter) in order to keep the stack pointer
> 64-bit aligned, as required by EABI.
Nicolas,
Thanks for letting me know this. I've marked this example as wrong in wiki.
On Mon, 6 Sep 2010, Yao Qi wrote:
> Yao Qi wrote:
> > Hi,
> > We are looking for some possible improvements and optimizations on
> > thumb2 code size. Currently, I am running some benchmarks with
> > compilation flag "-Os -march=armv7-a -mthumb", and hope to find some
> > thing interesting that w
Yao Qi wrote:
> Hi,
> We are looking for some possible improvements and optimizations on
> thumb2 code size. Currently, I am running some benchmarks with
> compilation flag "-Os -march=armv7-a -mthumb", and hope to find some
> thing interesting that we can improve. Beside that, do you have some
>
Loïc Minier wrote:
> On Fri, Sep 03, 2010, Yao Qi wrote:
>> We are looking for some possible improvements and optimizations on
>> thumb2 code size. Currently, I am running some benchmarks with
>> compilation flag "-Os -march=armv7-a -mthumb", and hope to find some
>> thing interesting that we can
On Fri, Sep 03, 2010, Yao Qi wrote:
> We are looking for some possible improvements and optimizations on
> thumb2 code size. Currently, I am running some benchmarks with
> compilation flag "-Os -march=armv7-a -mthumb", and hope to find some
> thing interesting that we can improve. Beside that, do
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