2. C++ AMP: Accelerated Massive Parallelism in Visual C++ 11 Kate Gregory Gregory Consulting www.gregcons.com/kateblog, @gregcons

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6. demo Cartoonizer

9. images source: AMD

12. void AddArrays(int n, int * pA, int * pB, int * pSum) { for (int i=0; i<n; i++) { pSum[i] = pA[i] + pB[i]; } #include using namespace concurrency; void AddArrays(int n, int * pA, int * pB, int * pSum) { array_view a(n, pA); array_view b(n, pB); array_view sum(n, pSum); parallel_for_each( sum.extent, [=](index i) restrict(amp) { sum[i] = a[i] + b[i]; } ); } void AddArrays(int n, int * pA, int * pB, int * pSum) { for (int i=0; i<n; i++) { pSum[i] = pA[i] + pB[i]; }

13. void AddArrays(int n, int * pA, int * pB, int * pSum) { array_view a(n, pA); array_view b(n, pB); array_view sum(n, pSum); parallel_for_each( sum.extent, [=](index i) restrict(amp) { sum[i] = a[i] + b[i]; } ); } array_view variables captured and associated data copied to accelerator (on demand) restrict(amp): tells the compiler to check that this code conforms to C++ AMP language restrictions parallel_for_each: execute the lambda on the accelerator once per thread extent: the number and shape of threads to execute the lambda index: the thread ID that is running the lambda, used to index into data array_view: wraps the data to operate on the accelerator

16. vector v(10); extent e(2,5); array_view a(e, v); //above two lines can also be written //array_view a(2,5,v); index i(1,3); int o = a[i]; // or a[i] = 16; //or int o = a(1, 3);

17. demo Matrix Multiplication

21. vector v(8 * 12); extent e(8,12); accelerator acc = … array a(e,acc.default_view); copy_async(v.begin(), v.end(), a); parallel_for_each(e, [&](index idx) restrict(amp) { a[idx] += 1; }); copy(a, v.begin());

24. array_view data(2, 6, p_my_data); parallel_for_each( data.extent.tile (), [=] (tiled_index t_idx)… { … }); T T

40. http://blogs.msdn.com/nativeconcurrency/

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47. play, fun, entertainment notebook, learning mouselearn, ideasfile, papershare, concepts share, speech bubble thought bubble search, learning coffee, work, office computer monitor luggage, travel badge, registration global, locationthe cloudairplane, travel this way, look here twitterdecorative arrowthis way, arrowBirds of a feather finance, calculator this way, arrowhands-on labsthis way, connect

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50. demo Name Title Group Demo Title