OpenBLAS/kernel/arm64/dot_kernel_sve.c

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#include "common.h"

#include <arm_sve.h>

#ifdef DOUBLE
#define SVE_TYPE svfloat64_t
#define SVE_ZERO svdup_f64(0.0)
#define SVE_WHILELT svwhilelt_b64
#define SVE_ALL svptrue_b64()
#define SVE_WIDTH svcntd()
#else
#define SVE_TYPE svfloat32_t
#define SVE_ZERO svdup_f32(0.0)
#define SVE_WHILELT svwhilelt_b32
#define SVE_ALL svptrue_b32()
#define SVE_WIDTH svcntw()
#endif

static FLOAT dot_kernel_sve(BLASLONG n, FLOAT *x, FLOAT *y) {
        SVE_TYPE acc_a = SVE_ZERO;
        SVE_TYPE acc_b = SVE_ZERO;

        BLASLONG sve_width = SVE_WIDTH;

        for (BLASLONG i = 0; i < n; i += sve_width * 2) {
                svbool_t pg_a = SVE_WHILELT((uint64_t)i, (uint64_t)n);
                svbool_t pg_b = SVE_WHILELT((uint64_t)(i + sve_width), (uint64_t)n);

                SVE_TYPE x_vec_a = svld1(pg_a, &x[i]);
                SVE_TYPE y_vec_a = svld1(pg_a, &y[i]);
                SVE_TYPE x_vec_b = svld1(pg_b, &x[i + sve_width]);
                SVE_TYPE y_vec_b = svld1(pg_b, &y[i + sve_width]);

                acc_a = svmla_m(pg_a, acc_a, x_vec_a, y_vec_a);
                acc_b = svmla_m(pg_b, acc_b, x_vec_b, y_vec_b);
        }

        return svaddv(SVE_ALL, acc_a) + svaddv(SVE_ALL, acc_b);
}