kernel/riscv64:Optimized the implementation of axpby on TARGET=RISCV64_ZVL256B.

kernel/riscv64/KERNEL.RISCV64_ZVL256B

@@ -169,6 +169,7 @@ SSYMV_U_KERNEL =  symv_U_vector.c
 SSYMV_L_KERNEL =  symv_L_vector.c
 DSYMV_U_KERNEL =  symv_U_vector.c
 DSYMV_L_KERNEL =  symv_L_vector.c
+
 CSYMV_U_KERNEL =  ../generic/zsymv_k.c
 CSYMV_L_KERNEL =  ../generic/zsymv_k.c
 ZSYMV_U_KERNEL =  ../generic/zsymv_k.c
@@ -207,3 +208,6 @@ COMATCOPY_CN = zomatcopy_cn_vector.c
 
 DOMATCOPY_CN = omatcopy_cn_vector.c
 SOMATCOPY_CN = omatcopy_cn_vector.c
+
+SAXPBYKERNEL  = axpby_vector_v2.c
+DAXPBYKERNEL  = axpby_vector_v2.c

kernel/riscv64/axpby_vector_v2.c

@@ -0,0 +1,149 @@
+/***************************************************************************
+Copyright (c) 2022, The OpenBLAS Project
+All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in
+the documentation and/or other materials provided with the
+distribution.
+3. Neither the name of the OpenBLAS project nor the names of
+its contributors may be used to endorse or promote products
+derived from this software without specific prior written permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*****************************************************************************/
+
+#include "common.h"
+
+#if !defined(DOUBLE)
+#define VSETVL(n) RISCV_RVV(vsetvl_e32m8)(n)
+#define FLOAT_V_T vfloat32m8_t
+#define VLEV_FLOAT RISCV_RVV(vle32_v_f32m8)
+#define VLSEV_FLOAT RISCV_RVV(vlse32_v_f32m8)
+#define VSEV_FLOAT RISCV_RVV(vse32_v_f32m8)
+#define VSSEV_FLOAT RISCV_RVV(vsse32_v_f32m8)
+#define VFMACCVF_FLOAT RISCV_RVV(vfmacc_vf_f32m8)
+#define VFMULVF_FLOAT RISCV_RVV(vfmul_vf_f32m8)
+#define VFMVVF_FLOAT RISCV_RVV(vfmv_v_f_f32m8)
+#else
+#define VSETVL(n) RISCV_RVV(vsetvl_e64m4)(n)
+#define FLOAT_V_T vfloat64m4_t
+#define VLEV_FLOAT RISCV_RVV(vle64_v_f64m4)
+#define VLSEV_FLOAT RISCV_RVV(vlse64_v_f64m4)
+#define VSEV_FLOAT RISCV_RVV(vse64_v_f64m4)
+#define VSSEV_FLOAT RISCV_RVV(vsse64_v_f64m4)
+#define VFMACCVF_FLOAT RISCV_RVV(vfmacc_vf_f64m4)
+#define VFMULVF_FLOAT RISCV_RVV(vfmul_vf_f64m4)
+#define VFMVVF_FLOAT RISCV_RVV(vfmv_v_f_f64m4)
+#endif
+
+int CNAME(BLASLONG n, FLOAT alpha, FLOAT *x, BLASLONG inc_x, FLOAT beta, FLOAT *y, BLASLONG inc_y)
+{
+    FLOAT_V_T vx, vy;
+    unsigned int gvl;
+    if (n <= 0)
+        return (0);
+    if (inc_x == 1 && inc_y == 1)
+    {
+        while (n > 0)
+        {
+            gvl = VSETVL(n);
+
+            vx = VLEV_FLOAT(x, gvl);
+            vy = VLEV_FLOAT(y, gvl);
+
+            vy = VFMULVF_FLOAT(vy, beta, gvl);
+            vy = VFMACCVF_FLOAT(vy, alpha, vx, gvl);
+
+            VSEV_FLOAT(y, vy, gvl);
+
+            x += gvl;
+            y += gvl;
+            n -= gvl;
+        }
+    }
+    else if (1 == inc_x)
+    {
+        BLASLONG stride_y = inc_y * sizeof(FLOAT);
+        while (n > 0)
+        {
+            gvl = VSETVL(n);
+            vy = VLSEV_FLOAT(y, stride_y, gvl);
+            vx = VLEV_FLOAT(x, gvl);
+
+            vy = VFMULVF_FLOAT(vy, beta, gvl);
+            vy = VFMACCVF_FLOAT(vy, alpha, vx, gvl);
+
+            VSSEV_FLOAT(y, stride_y, vy, gvl);
+
+            x += gvl;
+            y += gvl * inc_y;
+            n -= gvl;
+        }
+    }
+    else if (1 == inc_y)
+    {
+        BLASLONG stride_x = inc_x * sizeof(FLOAT);
+
+        while (n > 0)
+        {
+            gvl = VSETVL(n);
+
+            vx = VLSEV_FLOAT(x, stride_x, gvl);
+            vy = VLEV_FLOAT(y, gvl);
+
+            vy = VFMULVF_FLOAT(vy, beta, gvl);
+            vy = VFMACCVF_FLOAT(vy, alpha, vx, gvl);
+
+            VSEV_FLOAT(y, vy, gvl);
+
+            x += gvl * inc_x;
+            y += gvl;
+            n -= gvl;
+        }
+    }
+    else if (inc_y == 0)
+    {
+        FLOAT vf = y[0];
+        for (; n > 0; n--)
+        {
+            vf = (vf * beta) + (x[0] * alpha);
+            x += inc_x;
+        }
+        y[0] = vf;
+    }
+    else
+    {
+        BLASLONG stride_x = inc_x * sizeof(FLOAT);
+        BLASLONG stride_y = inc_y * sizeof(FLOAT);
+        while (n > 0)
+        {
+            gvl = VSETVL(n);
+            vy = VLSEV_FLOAT(y, stride_y, gvl);
+            vx = VLSEV_FLOAT(x, stride_x, gvl);
+
+            vy = VFMULVF_FLOAT(vy, beta, gvl);
+            vy = VFMACCVF_FLOAT(vy, alpha, vx, gvl);
+
+            VSSEV_FLOAT(y, stride_y, vy, gvl);
+
+            x += gvl * inc_x;
+            y += gvl * inc_y;
+            n -= gvl;
+        }
+    }
+
+    return (0);
+}