Developer Guide and Reference

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Example 3

Example 3 demonstrates the declaration of a Structure of Arrays (SoA) interacting with a forward dependency.
#include <stdio.h> #include <sdlt/primitive.h> #include <sdlt/soa1d_container.h> #define N 1024 typedef struct RGBs { float r; float g; float b; } RGBTy; SDLT_PRIMITIVE(RGBTy, r, g, b) void main() { // RGBTy a[N]; // AOS data layout sdlt::soa1d_container<RGBTy> aContainer(N); auto a = aContainer.access(); // SOA data layout // use SDLT access method to access struct members r, g, and b. // with unit-stride access after vectorization #pragma omp simd for (int k = 0; k<N; k++) { a[k].r() = k*1.5; a[k].g() = k*2.5; a[k].b() = k*3.5; } // Test forward-dependency on SOA memory access #pragma omp simd for (int i = 0; i<N - 1; i++) { sdlt::linear_index k(i); a[k].r() = a[k + 1].r() + k*1.5; a[k].g() = a[k + 1].g() + k*2.5; a[k].b() = a[k + 1].b() + k*3.5; } std::cout << "k =" << 10 << ", a[k].r =" << a[10].r() << ", a[k].g =" << a[10].g() << ", a[k].b =" << a[10].b() << std::endl; }

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.