diff --git a/Makefile.prebuild b/Makefile.prebuild
index c4f4a2602..d30275f06 100644
--- a/Makefile.prebuild
+++ b/Makefile.prebuild
@@ -59,6 +59,10 @@ ifeq ($(TARGET), x280)
 TARGET_FLAGS = -march=rv64imafdcv_zba_zbb_zfh -mabi=lp64d
 endif
 
+ifeq ($(TARGET), RISCV64_ZVL256B)
+TARGET_FLAGS = -march=rv64imafdcv_zba_zbb_zfh -mabi=lp64d
+endif
+
 ifeq ($(TARGET), RISCV64_GENERIC)
 TARGET_FLAGS = -march=rv64imafdc -mabi=lp64d
 endif
diff --git a/Makefile.riscv64 b/Makefile.riscv64
index ce7a27141..2239a3676 100644
--- a/Makefile.riscv64
+++ b/Makefile.riscv64
@@ -6,6 +6,10 @@ ifeq ($(CORE), x280)
 CCOMMON_OPT += -march=rv64imafdcv_zba_zbb_zfh_zvl512b -mabi=lp64d -ffast-math
 FCOMMON_OPT += -march=rv64imafdcv_zba_zbb_zfh -mabi=lp64d -static
 endif
+ifeq ($(CORE), RISCV64_ZVL256B)
+CCOMMON_OPT += -march=rv64imafdcv_zba_zbb_zfh_zvl256b -mabi=lp64d
+FCOMMON_OPT += -march=rv64imafdcv_zba_zbb_zfh -mabi=lp64d -static
+endif
 ifeq ($(CORE), RISCV64_GENERIC)
 CCOMMON_OPT += -march=rv64imafdc -mabi=lp64d
 FCOMMON_OPT += -march=rv64imafdc -mabi=lp64d -static
diff --git a/TargetList.txt b/TargetList.txt
index f76f605cc..f65a18b50 100644
--- a/TargetList.txt
+++ b/TargetList.txt
@@ -121,6 +121,7 @@ Z14
 RISCV64_GENERIC (e.g. PolarFire Soc/SiFive U54)
 C910V
 x280
+RISCV64_ZVL256B
 
 11.LOONGARCH64:
 LOONGSONGENERIC
diff --git a/getarch.c b/getarch.c
index 772836347..12ea72052 100644
--- a/getarch.c
+++ b/getarch.c
@@ -1692,6 +1692,20 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #else
 #endif
 
+#ifdef FORCE_RISCV64_ZVL256B
+#define FORCE
+#define ARCHITECTURE    "RISCV64"
+#define SUBARCHITECTURE "RISCV64_ZVL256B"
+#define SUBDIRNAME      "riscv64"
+#define ARCHCONFIG   "-DRISCV64_ZVL256B " \
+       "-DL1_DATA_SIZE=64536 -DL1_DATA_LINESIZE=32 " \
+       "-DL2_SIZE=262144 -DL2_LINESIZE=32 " \
+       "-DDTB_DEFAULT_ENTRIES=128 -DDTB_SIZE=4096 -DL2_ASSOCIATIVE=4 "
+#define LIBNAME   "riscv64_zvl256b"
+#define CORENAME  "RISCV64_ZVL256B"
+#else
+#endif
+
 
 #if defined(FORCE_E2K) || defined(__e2k__)
 #define FORCE
diff --git a/kernel/riscv64/KERNEL.C910V b/kernel/riscv64/KERNEL.C910V
index 0da66fa35..2798a870e 100644
--- a/kernel/riscv64/KERNEL.C910V
+++ b/kernel/riscv64/KERNEL.C910V
@@ -59,6 +59,7 @@ SDOTKERNEL   = dot_vector.c
 DDOTKERNEL   = dot_vector.c
 CDOTKERNEL   = zdot_vector.c
 ZDOTKERNEL   = zdot_vector.c
+DSDOTKERNEL  = dsdot_vector.c
 
 SNRM2KERNEL  = nrm2_vector.c
 DNRM2KERNEL  = nrm2_vector.c
diff --git a/kernel/riscv64/amin_vector.c b/kernel/riscv64/amin_vector.c
index 1c541f0fd..c4578eabf 100644
--- a/kernel/riscv64/amin_vector.c
+++ b/kernel/riscv64/amin_vector.c
@@ -31,15 +31,19 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #       define LMUL m2
 #       if defined(DOUBLE)
 #               define ELEN 64
+#               define ABS fabs
 #       else
 #               define ELEN 32
+#               define ABS fabsf
 #       endif
 #else
 #       define LMUL m8
 #       if defined(DOUBLE)
 #               define ELEN 64
+#               define ABS fabs
 #       else
 #               define ELEN 32
+#               define ABS fabsf
 #       endif
 #endif
 
@@ -69,7 +73,7 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
         FLOAT minf=0.0;
         if (n <= 0 || inc_x <= 0) return(minf);
 
-        minf = *x;
+        minf = ABS(*x);
         x += inc_x;
         --n;
         if (n == 0) return(minf);
diff --git a/kernel/riscv64/asum_vector.c b/kernel/riscv64/asum_vector.c
index 995dbf9a1..a652eafdd 100644
--- a/kernel/riscv64/asum_vector.c
+++ b/kernel/riscv64/asum_vector.c
@@ -67,7 +67,6 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
 {
 	BLASLONG i=0, j=0;
-	BLASLONG ix=0;
 	FLOAT asumf=0.0;
 	if (n <= 0 || inc_x <= 0) return(asumf);
         unsigned int gvl = 0;
@@ -103,17 +102,15 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
                 unsigned int stride_x = inc_x * sizeof(FLOAT);
                 if(gvl <= n/2){
                         v_sum = VFMVVF_FLOAT(0, gvl);
-                        BLASLONG inc_xv = inc_x * gvl;
                         for(i=0,j=0; i<n/(gvl*2); i++){
-                                v0 = VLSEV_FLOAT(&x[ix], stride_x, gvl);
+                                v0 = VLSEV_FLOAT(&x[j*inc_x], stride_x, gvl);
                                 v0 = VFABS_FLOAT(v0, gvl);
                                 v_sum = VFADDVV_FLOAT(v_sum, v0, gvl);
 
-                                v1 = VLSEV_FLOAT(&x[ix+inc_xv], stride_x, gvl);
+                                v1 = VLSEV_FLOAT(&x[(j+gvl)*inc_x], stride_x, gvl);
                                 v1 = VFABS_FLOAT(v1, gvl);
                                 v_sum = VFADDVV_FLOAT(v_sum, v1, gvl);
                                 j += gvl * 2;
-                                inc_xv += inc_xv * 2;
                         }
                         v_res = VFREDSUMVS_FLOAT(v_sum, v_res, gvl);
                 }
diff --git a/kernel/riscv64/axpby_vector.c b/kernel/riscv64/axpby_vector.c
index 386c4a5f1..850fc903e 100644
--- a/kernel/riscv64/axpby_vector.c
+++ b/kernel/riscv64/axpby_vector.c
@@ -60,7 +60,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 int CNAME(BLASLONG n, FLOAT alpha, FLOAT *x, BLASLONG inc_x, FLOAT beta, FLOAT *y, BLASLONG inc_y)
 {
-	if (n < 0)  return(0);
+	if (n <= 0)  return(0);
 
 	BLASLONG i=0, j=0;
 	unsigned int gvl = 0;
diff --git a/kernel/riscv64/dgemm_kernel_8x4_c910v.c b/kernel/riscv64/dgemm_kernel_8x4_c910v.c
index 79a7a98d9..b9bccbd49 100644
--- a/kernel/riscv64/dgemm_kernel_8x4_c910v.c
+++ b/kernel/riscv64/dgemm_kernel_8x4_c910v.c
@@ -196,7 +196,7 @@ int CNAME(BLASLONG bm,BLASLONG bn,BLASLONG bk,FLOAT alpha,FLOAT* ba,FLOAT* bb,FL
 		   
 		   asm volatile(
 				"vsetvli    zero, zero, e64,m1 \n\t"
-				"fmv.w.x    ft11, zero         \n\t"
+				"fmv.d.x    ft11, zero         \n\t"
 				"mv         t0,   %[BK]        \n\t"
 				
 				"vfmv.v.f   v16,  ft11         \n\t"
diff --git a/kernel/riscv64/dsdot_vector.c b/kernel/riscv64/dsdot_vector.c
new file mode 100644
index 000000000..e972828b5
--- /dev/null
+++ b/kernel/riscv64/dsdot_vector.c
@@ -0,0 +1,152 @@
+/***************************************************************************
+Copyright (c) 2023, 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"
+
+double CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
+{
+        BLASLONG i=0, j=0;
+        double dot = 0.0 ;
+
+        if ( n < 1 )  return(dot);
+        vfloat64m4_t vr;
+        vfloat32m2_t vx, vy;
+        unsigned int gvl = 0;
+        vfloat64m1_t v_res, v_z0;
+        gvl = vsetvlmax_e64m1();
+        v_res = vfmv_v_f_f64m1(0, gvl);
+        v_z0 = vfmv_v_f_f64m1(0, gvl);
+
+        if(inc_x == 1 && inc_y == 1){
+                gvl = vsetvl_e64m4(n);
+                vr = vfmv_v_f_f64m4(0, gvl);
+                for(i=0,j=0; i<n/gvl; i++){
+                        vx = vle32_v_f32m2(&x[j], gvl);
+                        vy = vle32_v_f32m2(&y[j], gvl);
+                        vr = vfwmacc_vv_f64m4(vr, vx, vy, gvl);
+                        j += gvl;
+                }
+                if(j > 0){
+                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
+                        dot += (double)vfmv_f_s_f64m1_f64(v_res);
+                }
+                //tail
+                if(j < n){
+                        gvl = vsetvl_e64m4(n-j);
+                        vx = vle32_v_f32m2(&x[j], gvl);
+                        vy = vle32_v_f32m2(&y[j], gvl);
+                        vfloat64m4_t vz = vfmv_v_f_f64m4(0, gvl);
+                        //vr = vfdot_vv_f32m2(vx, vy, gvl);
+                        vr = vfwmacc_vv_f64m4(vz, vx, vy, gvl);
+                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
+                        dot += (double)vfmv_f_s_f64m1_f64(v_res);
+                }
+        }else if(inc_y == 1){
+                gvl = vsetvl_e64m4(n);
+                vr = vfmv_v_f_f64m4(0, gvl);
+                 int stride_x = inc_x * sizeof(FLOAT);
+                for(i=0,j=0; i<n/gvl; i++){
+                        vx = vlse32_v_f32m2(&x[j*inc_x], stride_x, gvl);
+                        vy = vle32_v_f32m2(&y[j], gvl);
+                        vr = vfwmacc_vv_f64m4(vr, vx, vy, gvl);
+                        j += gvl;
+                }
+                if(j > 0){
+                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
+                        dot += (double)vfmv_f_s_f64m1_f64(v_res);
+
+                }
+                //tail
+                if(j < n){
+                        gvl = vsetvl_e64m4(n-j);
+                        vx = vlse32_v_f32m2(&x[j*inc_x], stride_x, gvl);
+                        vy = vle32_v_f32m2(&y[j], gvl);
+                        vfloat64m4_t vz = vfmv_v_f_f64m4(0, gvl);
+                        //vr = vfdot_vv_f32m2(vx, vy, gvl);
+                        vr = vfwmacc_vv_f64m4(vz, vx, vy, gvl);
+                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
+                        dot += (double)vfmv_f_s_f64m1_f64(v_res);
+
+                }
+        }else if(inc_x == 1){
+                gvl = vsetvl_e64m4(n);
+                vr = vfmv_v_f_f64m4(0, gvl);
+                 int stride_y = inc_y * sizeof(FLOAT);
+                for(i=0,j=0; i<n/gvl; i++){
+                        vx = vle32_v_f32m2(&x[j], gvl);
+                        vy = vlse32_v_f32m2(&y[j*inc_y], stride_y, gvl);
+                        vr = vfwmacc_vv_f64m4(vr, vx, vy, gvl);
+                        j += gvl;
+                }
+                if(j > 0){
+                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
+                        dot += (double)vfmv_f_s_f64m1_f64(v_res);
+
+                }
+                //tail
+                if(j < n){
+                        gvl = vsetvl_e64m4(n-j);
+                        vx = vle32_v_f32m2(&x[j], gvl);
+                        vy = vlse32_v_f32m2(&y[j*inc_y], stride_y, gvl);
+                        vfloat64m4_t vz = vfmv_v_f_f64m4(0, gvl);
+                        //vr = vfdot_vv_f32m2(vx, vy, gvl);
+                        vr = vfwmacc_vv_f64m4(vz, vx, vy, gvl);
+                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
+                        dot += (double)vfmv_f_s_f64m1_f64(v_res);
+
+                }
+        }else{
+                gvl = vsetvl_e64m4(n);
+                vr = vfmv_v_f_f64m4(0, gvl);
+                 int stride_x = inc_x * sizeof(FLOAT);
+                 int stride_y = inc_y * sizeof(FLOAT);
+                for(i=0,j=0; i<n/gvl; i++){
+                        vx = vlse32_v_f32m2(&x[j*inc_x], stride_x, gvl);
+                        vy = vlse32_v_f32m2(&y[j*inc_y], stride_y, gvl);
+                        vr = vfwmacc_vv_f64m4(vr, vx, vy, gvl);
+                        j += gvl;
+                }
+                if(j > 0){
+                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
+                        dot += (double)vfmv_f_s_f64m1_f64(v_res);
+
+                }
+                //tail
+                if(j < n){
+                        gvl = vsetvl_e64m4(n-j);
+                        vx = vlse32_v_f32m2(&x[j*inc_x], stride_x, gvl);
+                        vy = vlse32_v_f32m2(&y[j*inc_y], stride_y, gvl);
+                        vfloat64m4_t vz = vfmv_v_f_f64m4(0, gvl);
+                        //vr = vfdot_vv_f32m2(vx, vy, gvl);
+                        vr = vfwmacc_vv_f64m4(vz, vx, vy, gvl);
+                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
+                        dot += (double)vfmv_f_s_f64m1_f64(v_res);
+
+                }
+        }
+        return(dot);
+}
diff --git a/kernel/riscv64/iamin_vector.c b/kernel/riscv64/iamin_vector.c
index a58872960..0e591e697 100644
--- a/kernel/riscv64/iamin_vector.c
+++ b/kernel/riscv64/iamin_vector.c
@@ -139,7 +139,7 @@ BLASLONG CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
 
                         v_res = VFREDMINVS_FLOAT(v_min, v_res, gvl);
                         FLOAT cur_minf = EXTRACT_FLOAT(v_res);
-                        if(cur_minf > minf){
+                        if(cur_minf < minf){
                                 //tail index
                                 v_min_index = VIDV_UINT(gvl);
                                 v_min_index = VADDVX_UINT(v_min_index, j, gvl);
@@ -185,7 +185,7 @@ BLASLONG CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
 
                         v_res = VFREDMINVS_FLOAT(v_min, v_res, gvl);
                         FLOAT cur_minf = EXTRACT_FLOAT(v_res);
-                        if(cur_minf > minf){
+                        if(cur_minf < minf){
                                 //tail index
                                 v_min_index = VIDV_UINT(gvl);
                                 v_min_index = VADDVX_UINT(v_min_index, j, gvl);
diff --git a/kernel/riscv64/izamin_vector.c b/kernel/riscv64/izamin_vector.c
index a3877a46c..c76a38099 100644
--- a/kernel/riscv64/izamin_vector.c
+++ b/kernel/riscv64/izamin_vector.c
@@ -156,7 +156,7 @@ BLASLONG CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
 
                 v_res = VFREDMINVS_FLOAT(v_min, v_res, gvl);
                 FLOAT cur_minf = EXTRACT_FLOAT(v_res);
-                if(cur_minf > minf){
+                if(cur_minf < minf){
                         //tail index
                         v_min_index = VIDV_UINT(gvl);
                         v_min_index = VADDVX_UINT(v_min_index, j, gvl);
diff --git a/kernel/riscv64/nrm2_vector.c b/kernel/riscv64/nrm2_vector.c
index 141dffebf..5c03fbec7 100644
--- a/kernel/riscv64/nrm2_vector.c
+++ b/kernel/riscv64/nrm2_vector.c
@@ -104,7 +104,7 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
 {
 	BLASLONG i=0;
 
-	if(n <= 0)  return(0.0);
+	if (n <= 0 || inc_x <= 0) return(0.0);
         if(n == 1) return (ABS(x[0]));
 
         unsigned int gvl = 0;
diff --git a/kernel/riscv64/nrm2_vector_dot.c b/kernel/riscv64/nrm2_vector_dot.c
index 06e61d695..dfa13a6f5 100644
--- a/kernel/riscv64/nrm2_vector_dot.c
+++ b/kernel/riscv64/nrm2_vector_dot.c
@@ -61,7 +61,7 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
 	BLASLONG i=0, j=0;
 	double len = 0.0 ;
 
-	if ( n < 0 )  return(0.0);
+	if ( n <= 0 )  return(0.0);
         if(n == 1) return (ABS(x[0]));
 
         FLOAT_V_T vr, v0, v1;
diff --git a/kernel/riscv64/swap_vector.c b/kernel/riscv64/swap_vector.c
index 3b467a586..f583f5392 100644
--- a/kernel/riscv64/swap_vector.c
+++ b/kernel/riscv64/swap_vector.c
@@ -67,7 +67,7 @@ int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT dummy3, FLOAT *x,
         BLASLONG stride_x, stride_y;
         FLOAT_V_T vx0, vx1, vy0, vy1;
 
-	if (n < 0)  return(0);
+	if (n <= 0)  return(0);
 
         unsigned int gvl = VSETVL((inc_x != 0 && inc_y != 0) ? n : 1);
         if( inc_x == 0 && inc_y == 0 ) { n = n & 1; }
diff --git a/kernel/riscv64/zamax_vector.c b/kernel/riscv64/zamax_vector.c
index 2dee5ab29..ec4a5a1e9 100644
--- a/kernel/riscv64/zamax_vector.c
+++ b/kernel/riscv64/zamax_vector.c
@@ -60,17 +60,15 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define VLSEV_FLOAT     JOIN(RISCV_RVV(vlse),      ELEN,   _v_f,   ELEN,   LMUL)
 #ifdef RISCV_0p10_INTRINSICS
 #define VFREDMAXVS_FLOAT(va,vb,gvl) JOIN(RISCV_RVV(vfredmax_vs_f),  ELEN,   LMUL,   _f, JOIN2( ELEN,   m1)) (v_res, va, vb, gvl)
-#define VFRSUBVF_MASK_FLOAT(va,vb,c,gvl) JOIN(RISCV_RVV(vfrsub),_vf_f,  ELEN,   LMUL,   _m) (va, vb, vb, c, gvl)
 #else
 #define VFREDMAXVS_FLOAT JOIN(RISCV_RVV(vfredmax_vs_f),  ELEN,   LMUL,   _f, JOIN2( ELEN,   m1))
-#define VFRSUBVF_MASK_FLOAT JOIN(RISCV_RVV(vfrsub),_vf_f,  ELEN,   LMUL,   _m)
 #endif
 #define MASK_T          JOIN(vbool,             MLEN,   _t,     _,      _)
-#define VMFLTVF_FLOAT   JOIN(RISCV_RVV(vmflt_vf_f), ELEN,  LMUL,   _b,     MLEN)
 #define VFMVVF_FLOAT    JOIN(RISCV_RVV(vfmv),      _v_f_f, ELEN,   LMUL,   _)
 #define VFMVVF_FLOAT_M1 JOIN(RISCV_RVV(vfmv),      _v_f_f, ELEN,   m1,     _)
 #define VFMAXVV_FLOAT   JOIN(RISCV_RVV(vfmax),     _vv_f,  ELEN,   LMUL,   _)
 #define VFADDVV_FLOAT   JOIN(RISCV_RVV(vfadd),     _vv_f,  ELEN,   LMUL,   _)
+#define VFABSV_FLOAT   JOIN(RISCV_RVV(vfabs),     _v_f,  ELEN,   LMUL,   _)
 
 FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
 {
@@ -91,10 +89,9 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
         for(; i<n/gvl; i++){
                 v0 = VLSEV_FLOAT(&x[ix], stride_x, gvl);
                 v1 = VLSEV_FLOAT(&x[ix+1], stride_x, gvl);
-                mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
-                v0 = VFRSUBVF_MASK_FLOAT(mask0, v0, 0, gvl);
-                mask1 = VMFLTVF_FLOAT(v1, 0, gvl);
-                v1 = VFRSUBVF_MASK_FLOAT(mask1, v1, 0, gvl);
+
+                v0 = VFABSV_FLOAT(v0, gvl);
+                v1 = VFABSV_FLOAT(v1, gvl);
 
                 v0 = VFADDVV_FLOAT(v0, v1, gvl);
                 v_max = VFMAXVV_FLOAT(v_max, v0, gvl);
@@ -108,10 +105,8 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
                 gvl = VSETVL(n-j);
                 v0 = VLSEV_FLOAT(&x[ix], stride_x, gvl);
                 v1 = VLSEV_FLOAT(&x[ix+1], stride_x, gvl);
-                mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
-                v0 = VFRSUBVF_MASK_FLOAT(mask0, v0, 0, gvl);
-                mask1 = VMFLTVF_FLOAT(v1, 0, gvl);
-                v1 = VFRSUBVF_MASK_FLOAT(mask1, v1, 0, gvl);
+                v0 = VFABSV_FLOAT(v0, gvl);
+                v1 = VFABSV_FLOAT(v1, gvl);
                 v1 = VFADDVV_FLOAT(v0, v1, gvl);
                 v_res = VFREDMAXVS_FLOAT(v1, v_res, gvl);
         }
diff --git a/kernel/riscv64/zamin_vector.c b/kernel/riscv64/zamin_vector.c
index df9a7a7e1..45b3e0b9d 100644
--- a/kernel/riscv64/zamin_vector.c
+++ b/kernel/riscv64/zamin_vector.c
@@ -62,17 +62,15 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define VLSEV_FLOAT     JOIN(RISCV_RVV(vlse),      ELEN,   _v_f,   ELEN,   LMUL)
 #ifdef RISCV_0p10_INTRINSICS
 #define VFREDMINVS_FLOAT(va,vb,gvl) JOIN(RISCV_RVV(vfredmin_vs_f),  ELEN,   LMUL,   _f, JOIN2( ELEN,   m1)) (v_res, va, vb, gvl)
-#define VFRSUBVF_MASK_FLOAT(va,vb,c,gvl) JOIN(RISCV_RVV(vfrsub),_vf_f,  ELEN,   LMUL,   _m) (va, vb, vb, c, gvl)
 #else
 #define VFREDMINVS_FLOAT JOIN(RISCV_RVV(vfredmin_vs_f),  ELEN,   LMUL,   _f, JOIN2( ELEN,   m1))
-#define VFRSUBVF_MASK_FLOAT JOIN(RISCV_RVV(vfrsub),_vf_f,  ELEN,   LMUL,   _m)
 #endif
 #define MASK_T          JOIN(vbool,             MLEN,   _t,     _,      _)
-#define VMFLTVF_FLOAT   JOIN(RISCV_RVV(vmflt_vf_f), ELEN,  LMUL,   _b,     MLEN)
 #define VFMVVF_FLOAT    JOIN(RISCV_RVV(vfmv),      _v_f_f, ELEN,   LMUL,   _)
 #define VFMVVF_FLOAT_M1 JOIN(RISCV_RVV(vfmv),      _v_f_f, ELEN,   m1,     _)
 #define VFMINVV_FLOAT   JOIN(RISCV_RVV(vfmin),     _vv_f,  ELEN,   LMUL,   _)
 #define VFADDVV_FLOAT   JOIN(RISCV_RVV(vfadd),     _vv_f,  ELEN,   LMUL,   _)
+#define VFABSV_FLOAT   JOIN(RISCV_RVV(vfabs),     _v_f,  ELEN,   LMUL,   _)
 
 FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
 {
@@ -93,10 +91,9 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
         for(; i<n/gvl; i++){
                 v0 = VLSEV_FLOAT(&x[ix], stride_x, gvl);
                 v1 = VLSEV_FLOAT(&x[ix+1], stride_x, gvl);
-                mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
-                v0 = VFRSUBVF_MASK_FLOAT(mask0, v0, 0, gvl);
-                mask1 = VMFLTVF_FLOAT(v1, 0, gvl);
-                v1 = VFRSUBVF_MASK_FLOAT(mask1, v1, 0, gvl);
+
+                v0 = VFABSV_FLOAT(v0, gvl);
+                v1 = VFABSV_FLOAT(v1, gvl);
 
                 v0 = VFADDVV_FLOAT(v0, v1, gvl);
                 v_min = VFMINVV_FLOAT(v_min, v0, gvl);
@@ -110,10 +107,8 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
                 gvl = VSETVL(n-j);
                 v0 = VLSEV_FLOAT(&x[ix], stride_x, gvl);
                 v1 = VLSEV_FLOAT(&x[ix+1], stride_x, gvl);
-                mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
-                v0 = VFRSUBVF_MASK_FLOAT(mask0, v0, 0, gvl);
-                mask1 = VMFLTVF_FLOAT(v1, 0, gvl);
-                v1 = VFRSUBVF_MASK_FLOAT(mask1, v1, 0, gvl);
+                v0 = VFABSV_FLOAT(v0, gvl);
+                v1 = VFABSV_FLOAT(v1, gvl);
                 v1 = VFADDVV_FLOAT(v0, v1, gvl);
                 v_res = VFREDMINVS_FLOAT(v1, v_res, gvl);
         }
diff --git a/kernel/riscv64/znrm2_vector.c b/kernel/riscv64/znrm2_vector.c
index 8614f7539..6ee3be79e 100644
--- a/kernel/riscv64/znrm2_vector.c
+++ b/kernel/riscv64/znrm2_vector.c
@@ -96,7 +96,7 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
 {
         BLASLONG i=0;
 
-        if(n < 0)  return(0.0);
+	if (n <= 0 || inc_x <= 0) return(0.0);
 
         FLOAT_V_T v_ssq, v_scale, v0, v1, v_zero;
         unsigned int gvl = 0;
diff --git a/kernel/riscv64/zswap_vector.c b/kernel/riscv64/zswap_vector.c
index 02c98b588..f2734c4a9 100644
--- a/kernel/riscv64/zswap_vector.c
+++ b/kernel/riscv64/zswap_vector.c
@@ -69,7 +69,7 @@ int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT dummy3, FLOAT dumm
         unsigned int gvl = VSETVL((inc_x != 0 && inc_y != 0) ? n : 1);
         if( inc_x == 0 && inc_y == 0 ) { n = n & 1; }
 
-	if (n < 0)  return(0);
+	if (n <= 0)  return(0);
         if(inc_x == 1 && inc_y == 1){
                 BLASLONG n2 = n * 2;
                 if(gvl <= n2/2){