diff --git a/target/riscv/helper.h b/target/riscv/helper.h
index e1dc1f83d3..1c301c1440 100644
--- a/target/riscv/helper.h
+++ b/target/riscv/helper.h
@@ -1078,6 +1078,8 @@ DEF_HELPER_6(vfredmin_vs_d, void, ptr, ptr, ptr, ptr, env, i32)
 
 DEF_HELPER_6(vfwredsum_vs_h, void, ptr, ptr, ptr, ptr, env, i32)
 DEF_HELPER_6(vfwredsum_vs_w, void, ptr, ptr, ptr, ptr, env, i32)
+DEF_HELPER_6(vfwredosum_vs_h, void, ptr, ptr, ptr, ptr, env, i32)
+DEF_HELPER_6(vfwredosum_vs_w, void, ptr, ptr, ptr, ptr, env, i32)
 
 DEF_HELPER_6(vmand_mm, void, ptr, ptr, ptr, ptr, env, i32)
 DEF_HELPER_6(vmnand_mm, void, ptr, ptr, ptr, ptr, env, i32)
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index 0fe46c10c2..e32946b1f5 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -580,7 +580,8 @@ vfredosum_vs    000011 . ..... ..... 001 ..... 1010111 @r_vm
 vfredmin_vs     000101 . ..... ..... 001 ..... 1010111 @r_vm
 vfredmax_vs     000111 . ..... ..... 001 ..... 1010111 @r_vm
 # Vector widening ordered and unordered float reduction sum
-vfwredsum_vs    1100-1 . ..... ..... 001 ..... 1010111 @r_vm
+vfwredsum_vs    110001 . ..... ..... 001 ..... 1010111 @r_vm
+vfwredosum_vs   110011 . ..... ..... 001 ..... 1010111 @r_vm
 vmand_mm        011001 - ..... ..... 010 ..... 1010111 @r
 vmnand_mm       011101 - ..... ..... 010 ..... 1010111 @r
 vmandnot_mm     011000 - ..... ..... 010 ..... 1010111 @r
diff --git a/target/riscv/insn_trans/trans_rvv.inc.c b/target/riscv/insn_trans/trans_rvv.inc.c
index f308b2bc3b..34b0392625 100644
--- a/target/riscv/insn_trans/trans_rvv.inc.c
+++ b/target/riscv/insn_trans/trans_rvv.inc.c
@@ -2778,7 +2778,8 @@ GEN_OPFVV_TRANS(vfredmax_vs, reduction_check)
 GEN_OPFVV_TRANS(vfredmin_vs, reduction_check)
 
 /* Vector Widening Floating-Point Reduction Instructions */
-GEN_OPFVV_WIDEN_TRANS(vfwredsum_vs, reduction_check)
+GEN_OPFVV_WIDEN_TRANS(vfwredsum_vs, reduction_widen_check)
+GEN_OPFVV_WIDEN_TRANS(vfwredosum_vs, reduction_widen_check)
 
 /*
  *** Vector Mask Operations
diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 76ce3c8e3e..67d5fd37aa 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -4798,6 +4798,51 @@ GEN_VEXT_FRED(vfredmin_vs_d, uint64_t, uint64_t, H8, H8, false,
               float64_minnum_noprop, clearq)
 
 /* Vector Widening Floating-Point Reduction Instructions */
+/* Ordered reduce 2*SEW = 2*SEW + sum(promote(SEW)) */
+void HELPER(vfwredosum_vs_h)(void *vd, void *v0, void *vs1,
+                             void *vs2, CPURISCVState *env, uint32_t desc)
+{
+    uint32_t vm = vext_vm(desc);
+    uint32_t vta = vext_vta(desc);
+    uint32_t vl = env->vl;
+    uint32_t i;
+    uint32_t tot = env_archcpu(env)->cfg.vlen / 8;
+    uint32_t s1 =  *((uint32_t *)vs1 + H4(0));
+
+    for (i = 0; i < vl; i++) {
+        uint16_t s2 = *((uint16_t *)vs2 + H2(i));
+        if (!vm && !vext_elem_mask(v0, i)) {
+            continue;
+        }
+        s1 = float32_add(s1, float16_to_float32(s2, true, &env->fp_status),
+                         &env->fp_status);
+    }
+    *((uint32_t *)vd + H4(0)) = s1;
+    clearl(vd, vta, 1, sizeof(uint32_t), tot);
+}
+
+void HELPER(vfwredosum_vs_w)(void *vd, void *v0, void *vs1,
+                             void *vs2, CPURISCVState *env, uint32_t desc)
+{
+    uint32_t vm = vext_vm(desc);
+    uint32_t vta = vext_vta(desc);
+    uint32_t vl = env->vl;
+    uint32_t i;
+    uint32_t tot = env_archcpu(env)->cfg.vlen / 8;
+    uint64_t s1 =  *((uint64_t *)vs1);
+
+    for (i = 0; i < vl; i++) {
+        uint32_t s2 = *((uint32_t *)vs2 + H4(i));
+        if (!vm && !vext_elem_mask(v0, i)) {
+            continue;
+        }
+        s1 = float64_add(s1, float32_to_float64(s2, &env->fp_status),
+                         &env->fp_status);
+    }
+    *((uint64_t *)vd) = s1;
+    clearq(vd, vta, 1, sizeof(uint64_t), tot);
+}
+
 /* Unordered reduce 2*SEW = 2*SEW + sum(promote(SEW)) */
 void HELPER(vfwredsum_vs_h)(void *vd, void *v0, void *vs1,
                             void *vs2, CPURISCVState *env, uint32_t desc)
@@ -4808,16 +4853,25 @@ void HELPER(vfwredsum_vs_h)(void *vd, void *v0, void *vs1,
     uint32_t i;
     uint32_t tot = env_archcpu(env)->cfg.vlen / 8;
     uint32_t s1 =  *((uint32_t *)vs1 + H4(0));
+    bool active = false;                                                   \
 
     for (i = 0; i < vl; i++) {
         uint16_t s2 = *((uint16_t *)vs2 + H2(i));
         if (!vm && !vext_elem_mask(v0, i)) {
             continue;
         }
+        active = true;
         s1 = float32_add(s1, float16_to_float32(s2, true, &env->fp_status),
                          &env->fp_status);
     }
-    *((uint32_t *)vd + H4(0)) = s1;
+
+    if (vl > 0) {
+        if (!active) {
+            *((uint32_t *)vd + H4(0)) = propagate_nan(s1, 32, &env->fp_status);
+        } else {
+            *((uint32_t *)vd + H4(0)) = s1;
+        }
+    }
     clearl(vd, vta, 1, sizeof(uint32_t), tot);
 }
 
@@ -4830,16 +4884,25 @@ void HELPER(vfwredsum_vs_w)(void *vd, void *v0, void *vs1,
     uint32_t i;
     uint32_t tot = env_archcpu(env)->cfg.vlen / 8;
     uint64_t s1 =  *((uint64_t *)vs1);
+    bool active = false;                                                   \
 
     for (i = 0; i < vl; i++) {
         uint32_t s2 = *((uint32_t *)vs2 + H4(i));
         if (!vm && !vext_elem_mask(v0, i)) {
             continue;
         }
+        active = true;
         s1 = float64_add(s1, float32_to_float64(s2, &env->fp_status),
                          &env->fp_status);
     }
-    *((uint64_t *)vd) = s1;
+
+    if (vl > 0) {
+        if (!active) {
+            *((uint64_t *)vd) = propagate_nan(s1, 64, &env->fp_status);
+        } else {
+            *((uint64_t *)vd) = s1;
+        }
+    }
     clearq(vd, vta, 1, sizeof(uint64_t), tot);
 }
 
