void test_vpaddls32 (void)
{
int64x1_t out_int64x1_t;
int32x2_t arg0_int32x2_t;
out_int64x1_t = vpaddl_s32 (arg0_int32x2_t);
}
/* return the sum of all elements in an array. This works by calculating 4 totals (one for each lane) and adding those at the end to get the final total */
int sum_array(int16_t *array, int size)
{
/* initialize the accumulator vector to zero */
int16x4_t acc = vdup_n_s16(0);
int32x2_t acc1;
int64x1_t acc2;
/* this implementation assumes the size of the array is a multiple of 4 */
assert((size % 4) == 0);
/* counting backwards gives better code */
for (; size != 0; size -= 4)
{
int16x4_t vec;
/* load 4 values in parallel from the array */
vec = vld1_s16(array);
/* increment the array pointer to the next element */
array += 4;
/* add the vector to the accumulator vector */
acc = vadd_s16(acc, vec);
}
/* calculate the total */
acc1 = vpaddl_s16(acc);
acc2 = vpaddl_s32(acc1);
/* return the total as an integer */
return (int)vget_lane_s64(acc2, 0);
}
