Ben Sander
65 строки
2.1 KiB
C++
65 строки
2.1 KiB
C++
// Simple test showing how to use HC syntax with AM (accelerator memory).
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// AM provides a set of c-style memory management routines for allocating,
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// freeing, and copying memory. am_alloc returns a device pointer
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// which can only be used on the device. The programmer has full control
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// over when data is copied.
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#include <hc.hpp>
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#include <hc_am.hpp>
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int main(int argc, char *argv[])
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{
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int sizeElements = 1000000;
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size_t sizeBytes = sizeElements * sizeof(float);
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bool pass = true;
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// Allocate host memory
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float *A_h = (float*)malloc(sizeBytes);
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float *B_h = (float*)malloc(sizeBytes);
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float *C_h = (float*)malloc(sizeBytes);
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// Allocate device pointers:
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// Unlike array_view, these must be explicitly managed by user:
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hc::accelerator acc; // grab default accelerator where we want to allocate memory:
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hc::accelerator_view av = acc.get_default_view();
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float *A_d, *B_d, *C_d;
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A_d = hc::am_alloc(sizeBytes, acc, 0);
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B_d = hc::am_alloc(sizeBytes, acc, 0);
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C_d = hc::am_alloc(sizeBytes, acc, 0);
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// Initialize host data
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for (int i=0; i<sizeElements; i++) {
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A_h[i] = 1.618f * i;
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B_h[i] = 3.142f * i;
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C_h[i] = 0;
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}
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av.copy(A_h, A_d, sizeBytes); // C++ copy H2D
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av.copy(B_h, B_d, sizeBytes); // C++ copy H2D
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// Launch kernel onto AV.
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// Because the kernel PFE and the copies are submitted to same AV, they will execute in order
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// and we don't need additional synchronization to ensure the copies complete before the PFE begins.
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hc::completion_future cf=
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hc::parallel_for_each(av, hc::extent<1> (sizeElements),
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[=] (hc::index<1> idx) [[hc]] {
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int i = idx[0];
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C_d[i] = A_d[i] + B_d[i];
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});
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// This copy is in same AV as the kernel and thus will wait for the kernel to finish before executing.
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av.copy(C_d, C_h, sizeBytes); // C++ copy D2H
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for (int i=0; i<sizeElements; i++) {
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float ref= 1.618f * i + 3.142f * i;
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if (C_h[i] != ref) {
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printf ("error:%d computed=%6.2f, reference=%6.2f\n", i, C_h[i], ref);
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pass = false;
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}
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};
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if (pass) printf ("PASSED!\n");
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}
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