Expose avx512_qsort functions to C programs

[r-devulap]

Build and use avx512_qsort in a C program using the following C functions:

void int16_avx512_qsort(int16_t* arr, int64_t arrsize)
void uint16_avx512_qsort(uint16_t* arr, int64_t arrsize)
void float16_avx512_qsort(uint16_t* arr, int64_t arrsize)
void int32_avx512_qsort(int32_t* arr, int64_t arrsize)
void uint32_avx512_qsort(uint32_t* arr, int64_t arrsize)
void float_avx512_qsort(float* arr, int64_t arrsize)
void int64_avx512_qsort(int64_t* arr, int64_t arrsize)
void uint64_avx512_qsort(uint64_t* arr, int64_t arrsize)
void double_avx512_qsort(double* arr, int64_t arrsize)

Example main.c:

#include <stdint.h>
void double_avx512_qsort(double*, int64_t);

int main() {
    const int ARRSIZE = 1000;
    double arr[ARRSIZE];

    /* Initialize elements is reverse order */
    for (int ii = 0; ii < ARRSIZE; ++ii) {
        arr[ii] = ARRSIZE - ii;
    }

    /* call avx512 quicksort */
    double_avx512_qsort(arr, ARRSIZE);
    return 0;
}

Steps to build:

g++ -c -fpic -x c++ avx512-64bit-qsort.hpp -o avx512qsort.o -march=skylake-avx512 -O3
gcc main.c avx512qsort.o -lm