Intel Cloth Tech-Demo Recompiled with SSE for AVX Emulation
If you don’t have a AVX-capable CPU but want to see Intel’s AVX cloth demo, here is a recompilation (done by Erwin Coumans, Bullet Physics main author) using AVX emulation with SSE instructions: Intel Cloth demo SSE version. No source code available, only the binary.
And now some numbers to see if the SSE recompilation is worth it. I tested both AVX and SSE versions on an Intel Sandy Bridge i5-2400:
AVX demo 1920×1080
- Serial: 10FPS
- 128bit: 82FPS
- 256bit: 85FPS
SSE demo 1920×1080
- Serial: 20FPS
- 128bit: 73FPS
- 256bit: 35FPS
The 128bit version works pretty well (and the serial version works faster than the original demo). SSE is a good alternative to AVX 128bit. But the 256bit emulation is another story…
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I wonder if NVIDIA will make a PhysX AVX version.
What will be the implications of that port?
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Source code added, it is simply using a modified version of Intel’s original AVX emulation header file. The avx emulation is likely slow, because of the brute force __emu_mm256_unpackhi_ps. My goal was not to have a fast AVX emulation, but just a version of the demo that runs the SSE version on non-AVX CPUs.
See http://code.google.com/p/bullet/issues/detail?id=474#c6
Note that the differences in performance of the serial/sse version are mainly because I recompiled the demo using Visual Studio 2010 C++ compiler and not the Intel C++ compiler.
Why do we need 265 AVX? Does the average user have anything to gain in his everyday applications (gaming included)?
The download link at Intel Cloth demo SSE version gives an error message as being invalid! :S
Oh Erwin’s link works! Thanks!
I am getting MSVC100.dll missing error! :S
Win7X64.
Uploaded a new precompiled binary, should avoid the MSVC100.dll missing error:
http://code.google.com/p/bullet/issues/detail?id=474#c9
To fix the missing MSVC100.dll
Install Microsoft Visual C++ 2010 Redistributable Package (x86) (4.8mb).
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=a7b7a05e-6de6-4d3a-a423-37bf0912db84