[Bf-committers] Cycles CPU Kernel on MSVC *all versions*

[Jürgen Herrmann]

Hi Brecht,

Cool stuff ;) I submitted a little Build patch for VS2012 to include intrin.h which is needed for _BitScanForward an _BitScanReverse 

I am curious what vs2012 makes of this.

Am 18.06.2013 um 13:59 schrieb Brecht Van Lommel <brechtvanlommel at pandora.be>:

> Hi Jürgen ,
> 
> BVH / triangle intersection is always going to take up a major part of
> rendering time, but I managed to optimize it some. For MSVC the BVH
> intersection is now twice as fast for e.g. the BMW scene, which gives
> a 30% render time reduction overall. I also added the /Ox compiler
> flag (which contains the other /O compiler flags you posted for the
> benchmark), that helps maybe 2% here.
> 
> On Fri, Jun 7, 2013 at 9:32 AM, Jürgen Herrmann <shadowrom at me.com> wrote:
>> Hi there,
>> 
>> after the Benchmarking I did I decided to try analyze the diferences between MinGW and MSVC build in depth.
>> First of all I ran several Benchmarks of math functions in both GCC an MSVC and found out:
>> Amazing! they are both equally fast! So math functions isn't the bottleneck here.
>> So I tried to get a grip on real data and tried out "Very Sleepy" ( free download at: http://www.codersnotes.com/sleepy ) to profile cycles on MSVC.
>> 
>> What I found here was quite interresting:
>> While rendering the most time is spent in ccl::bvh_intersect_instancing with 1292.15s (53.70%) O_o
>> Within this call the most time is spent in ccl::bvh_node_intersect with 872.47s (36.26%) .
>> 
>> So this is the part we'll have to look at ... I wonder how MinGW builds perform here, but I don't have a proper optimized build with debug info to compare :/
>> 
>> /Jürgen
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