opencv/cmake/checks/cpu_neon_dotprod.cpp

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#include <stdio.h>
#if (defined __GNUC__ && (defined __arm__ || defined __aarch64__)) || (defined _MSC_VER && defined _M_ARM64)
#include "arm_neon.h"
int test()
{
const unsigned int src[] = { 0, 0, 0, 0 };
unsigned int dst[4];
uint32x4_t v_src = *(uint32x4_t*)src;
uint8x16_t v_m0 = *(uint8x16_t*)src;
uint8x16_t v_m1 = *(uint8x16_t*)src;
uint32x4_t v_dst = vdotq_u32(v_src, v_m0, v_m1);
*(uint32x4_t*)dst = v_dst;
return (int)dst[0];
}
#else
#error "DOTPROD is not supported"
#endif
int main()
{
printf("%d\n", test());
return 0;
}