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Optimize the performance of sum by using universal intrinsics #2888

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Merged
martin-frbg merged 1 commit into from
Oct 12, 2020
Merged

Optimize the performance of sum by using universal intrinsics #2888

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48 changes: 40 additions & 8 deletions kernel/arm/sum.c
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Original file line number Diff line number Diff line change
Expand Up @@ -29,23 +29,55 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* trivial copy of asum.c with the ABS() removed *
**************************************************************************************/


#include "common.h"
#include "../simd/intrin.h"
#include <math.h>

FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
{
BLASLONG i=0;
BLASLONG i = 0;
FLOAT sumf = 0.0;
if (n <= 0 || inc_x <= 0) return(sumf);

if (n <= 0 || inc_x <= 0)
return (sumf);
n *= inc_x;
while(i < n)
if (inc_x == 1)
{
#if V_SIMD
const int vstep = v_nlanes_f32;
const int unrollx4 = n & (-vstep * 4);
const int unrollx = n & -vstep;
v_f32 vsum0 = v_zero_f32();
v_f32 vsum1 = v_zero_f32();
v_f32 vsum2 = v_zero_f32();
v_f32 vsum3 = v_zero_f32();
while (i < unrollx4)
{
vsum0 = v_add_f32(vsum0, v_loadu_f32(x));
vsum1 = v_add_f32(vsum1, v_loadu_f32(x + vstep));
vsum2 = v_add_f32(vsum2, v_loadu_f32(x + vstep * 2));
vsum3 = v_add_f32(vsum3, v_loadu_f32(x + vstep * 3));
i += vstep * 4;
}
vsum0 = v_add_f32(
v_add_f32(vsum0, vsum1), v_add_f32(vsum2, vsum3));
while (i < unrollx)
{
vsum0 = v_add_f32(vsum0, v_loadu_f32(x + i));
i += vstep;
}
sumf = v_sum_f32(vsum0);
#else
int n1 = n & -4;
for (; i < n1; i += 4)
{
sumf += x[i] + x[i + 1] + x[i + 2] + x[i + 3];
}
#endif
}
while (i < n)
{
sumf += x[i];
i += inc_x;
}
return(sumf);
return (sumf);
}