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Introdution to SSE or How to put your algorithms on steroids!

Introdution to SSE or How to put your algorithms on steroids!. Christian Kerl. Outline. What is SSE? Basic Operations Example: Image Pyramid Summary Further Resources. What is SSE?. SSE = S treaming S IMD E xtensions SIMD = S ingle I nstruction, M ultiple D ata

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Introdution to SSE or How to put your algorithms on steroids!

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  1. Introdution to SSEorHow to put your algorithms on steroids! Christian Kerl

  2. Outline • What is SSE? • Basic Operations • Example: Image Pyramid • Summary • Further Resources

  3. What is SSE? • SSE = Streaming SIMD Extensions • SIMD = Single Instruction, Multiple Data • Developed by Intel in 1999 • Further extensions SSE2, SSE3 (SSSE3, SSE4) • Allows parallel processing of multiple integer or floating point values

  4. What is SSE? • 8 XMM registers (special CPU registers, 16 on 64 bit) • Each XMM register is 128 bits wide • 2 int64 / doubles • 4 int32 / floats • 8 int16 • 16 int8

  5. What is SSE? • Special instructions working on XMM registers • SSE 70, SSE2 144, SSE3 13 instructions • Different instructions for each data type • Usable in • Assembly • C/C++ through SSE “intrinsics”

  6. Basic Operations • Load / Store • Arithmetic • Comparison / Logical • Type conversion • …

  7. Basic Operations • Requirements on memory layout for loading and storing data • Memory addresses (pointers) need to be 16 byte aligned!

  8. Example: Image Pyramid • Performance on 2560x1920 image • Standard C++ version: 7.4 ms • SSE optimized version: 1.62 ms => ≈ 4.5x speedup

  9. Summary • SSE available on all modern x86 CPUs • Good for sequential data processing • Provides considerable speedups (2-4x) • SSE intrinsic code harder to program and read => Use wrapper library, e.g. EasySSE, ut-sse • Need to evaluate / extend / write one

  10. Further Resources • Tutorials: • http://supercomputingblog.com/optimization/getting-started-with-sse-programming/ • http://www.codeproject.com/Articles/4522/Introduction-to-SSE-Programming • http://sci.tuomastonteri.fi/programming/sse • MSDN: good reference manual for intrinsics • http://msdn.microsoft.com/de-de/library/y0dh78ez • Wrapper Libraries: • http://sourceforge.net/projects/easysse/ • http://code.google.com/p/ut-sse/

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