ARM Skia NEON patches - 34 - Blur Filter

ARM Skia NEON patches - 34 - Blur Filter
Improve a little on Blur

Grouping operations gives a 5-15% speed improvement on a Cortex-A15 based Chromebook.

before:
running bench [640 480]   blur_image_filter_large_10.00_10.00   8888:  cmsecs =  30887.69
running bench [640 480]   blur_image_filter_small_10.00_10.00   8888:  cmsecs =  30751.35
running bench [640 480]     blur_image_filter_large_1.00_1.00   8888:  cmsecs =  30757.92
running bench [640 480]     blur_image_filter_small_1.00_1.00   8888:  cmsecs =  30673.88
running bench [640 480]     blur_image_filter_large_0.00_1.00   8888:  cmsecs =  19602.17
running bench [640 480]    blur_image_filter_large_0.00_10.00   8888:  cmsecs =  20613.81
running bench [640 480]     blur_image_filter_large_1.00_0.00   8888:  cmsecs =  17855.46
running bench [640 480]    blur_image_filter_large_10.00_0.00   8888:  cmsecs =  17957.79

after:
running bench [640 480]   blur_image_filter_large_10.00_10.00   8888:  cmsecs =  27015.75
running bench [640 480]   blur_image_filter_small_10.00_10.00   8888:  cmsecs =  27148.02
running bench [640 480]     blur_image_filter_large_1.00_1.00   8888:  cmsecs =  27241.60
running bench [640 480]     blur_image_filter_small_1.00_1.00   8888:  cmsecs =  27077.44
running bench [640 480]     blur_image_filter_large_0.00_1.00   8888:  cmsecs =  18458.10
running bench [640 480]    blur_image_filter_large_0.00_10.00   8888:  cmsecs =  19643.42
running bench [640 480]     blur_image_filter_large_1.00_0.00   8888:  cmsecs =  16176.73
running bench [640 480]    blur_image_filter_large_10.00_0.00   8888:  cmsecs =  16450.50

Signed-off-by: Kévin PETIT <kevin.petit@arm.com>;

BUG=

Committed: http://code.google.com/p/skia/source/detail?r=12568

[kevin.petit.not.used.account, 2013-12-09 15:17:09]

Hello,

After reviewing https://codereview.chromium.org/99933004, I found a few easy
improvements to do.

May I suggest that you invite me as a reviewer on future ARM/NEON changes. I may
not be available all the time but can probably give some useful tips when I am.

[Stephen White, 2013-12-09 15:38:53]

On 2013/12/09 15:17:09, kevin.petit.arm wrote:
> Hello,
> 
> After reviewing https://codereview.chromium.org/99933004, I found a few easy
> improvements to do.
> 
> May I suggest that you invite me as a reviewer on future ARM/NEON changes. I
may
> not be available all the time but can probably give some useful tips when I
am.

Fantastic, thanks! Will do!

[Stephen White, 2013-12-09 15:40:08]

LGTM

[commit-bot: I haz the power, 2013-12-09 15:51:08]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/kevin.petit.arm@gmail.com/109403004/1

[commit-bot: I haz the power, 2013-12-09 16:03:33]

Change committed as 12568

[robertphillips, 2013-12-09 20:16:42]

This was reverted in r12578 due to N4 image quality regressions

[robertphillips, 2013-12-09 20:35:43]

Sorry. I mistakenly believe this patch was responsible for some image
regressions. I have relanded it at r12581.