diff --git a/gcc/config/riscv/riscv-vector-builtins-bases.cc b/gcc/config/riscv/riscv-vector-builtins-bases.cc
index 839eb66efb2..52467bbc961 100644
--- a/gcc/config/riscv/riscv-vector-builtins-bases.cc
+++ b/gcc/config/riscv/riscv-vector-builtins-bases.cc
@@ -1658,6 +1658,21 @@ public:
   }
 };
 
+/* Implements vlenb.  */
+class vlenb : public function_base
+{
+public:
+  bool apply_vl_p () const override { return false; }
+
+  rtx expand (function_expander &e) const override
+  {
+    machine_mode mode = GET_MODE (e.target);
+    rtx vlenb = gen_int_mode (BYTES_PER_RISCV_VECTOR, mode);
+    emit_move_insn (e.target, vlenb);
+    return e.target;
+  }
+};
+
 static CONSTEXPR const vsetvl<false> vsetvl_obj;
 static CONSTEXPR const vsetvl<true> vsetvlmax_obj;
 static CONSTEXPR const loadstore<false, LST_UNIT_STRIDE, false> vle_obj;
@@ -1868,6 +1883,7 @@ static CONSTEXPR const vset vset_obj;
 static CONSTEXPR const vget vget_obj;
 static CONSTEXPR const read_vl read_vl_obj;
 static CONSTEXPR const vleff vleff_obj;
+static CONSTEXPR const vlenb vlenb_obj;
 
 /* Declare the function base NAME, pointing it to an instance
    of class <NAME>_obj.  */
@@ -2084,5 +2100,6 @@ BASE (vset)
 BASE (vget)
 BASE (read_vl)
 BASE (vleff)
+BASE (vlenb)
 
 } // end namespace riscv_vector
diff --git a/gcc/config/riscv/riscv-vector-builtins-bases.h b/gcc/config/riscv/riscv-vector-builtins-bases.h
index 14e8a55cd97..0196f80b69e 100644
--- a/gcc/config/riscv/riscv-vector-builtins-bases.h
+++ b/gcc/config/riscv/riscv-vector-builtins-bases.h
@@ -240,6 +240,7 @@ extern const function_base *const vset;
 extern const function_base *const vget;
 extern const function_base *const read_vl;
 extern const function_base *const vleff;
+extern const function_base *const vlenb;
 }
 
 } // end namespace riscv_vector
diff --git a/gcc/config/riscv/riscv-vector-builtins-functions.def b/gcc/config/riscv/riscv-vector-builtins-functions.def
index 198ccfd86b7..3f1513cb9fd 100644
--- a/gcc/config/riscv/riscv-vector-builtins-functions.def
+++ b/gcc/config/riscv/riscv-vector-builtins-functions.def
@@ -38,6 +38,7 @@ along with GCC; see the file COPYING3. If not see
 
 /* Internal helper functions for gimple fold use.  */
 DEF_RVV_FUNCTION (read_vl, read_vl, none_preds, p_none_void_ops)
+DEF_RVV_FUNCTION (vlenb, vlenb, none_preds, ul_none_void_ops)
 
 /* 6. Configuration-Setting Instructions.  */
 
diff --git a/gcc/config/riscv/riscv-vector-builtins-shapes.cc b/gcc/config/riscv/riscv-vector-builtins-shapes.cc
index edb0d34b81c..0682f81400a 100644
--- a/gcc/config/riscv/riscv-vector-builtins-shapes.cc
+++ b/gcc/config/riscv/riscv-vector-builtins-shapes.cc
@@ -553,6 +553,30 @@ struct fault_load_def : public build_base
   }
 };
 
+/* vlenb_def class.  */
+struct vlenb_def : public function_shape
+{
+  void build (function_builder &b,
+	      const function_group_info &group) const override
+  {
+    auto_vec<tree> argument_types;
+    function_instance function_instance (group.base_name, *group.base,
+					 *group.shape, group.ops_infos.types[0],
+					 group.preds[0], &group.ops_infos);
+    b.add_unique_function (function_instance, (*group.shape),
+			   long_unsigned_type_node, argument_types);
+  }
+
+  char *get_name (function_builder &b, const function_instance &instance,
+		  bool overloaded_p) const override
+  {
+    if (overloaded_p)
+      return nullptr;
+    b.append_base_name (instance.base_name);
+    return b.finish_name ();
+  }
+};
+
 SHAPE(vsetvl, vsetvl)
 SHAPE(vsetvl, vsetvlmax)
 SHAPE(loadstore, loadstore)
@@ -572,5 +596,6 @@ SHAPE(vset, vset)
 SHAPE(vget, vget)
 SHAPE(read_vl, read_vl)
 SHAPE(fault_load, fault_load)
+SHAPE(vlenb, vlenb)
 
 } // end namespace riscv_vector
diff --git a/gcc/config/riscv/riscv-vector-builtins-shapes.h b/gcc/config/riscv/riscv-vector-builtins-shapes.h
index 30780845f7b..aee2f94b04c 100644
--- a/gcc/config/riscv/riscv-vector-builtins-shapes.h
+++ b/gcc/config/riscv/riscv-vector-builtins-shapes.h
@@ -43,6 +43,7 @@ extern const function_shape *const vset;
 extern const function_shape *const vget;
 extern const function_shape *const read_vl;
 extern const function_shape *const fault_load;
+extern const function_shape *const vlenb;
 }
 
 } // end namespace riscv_vector
diff --git a/gcc/config/riscv/riscv-vector-builtins.cc b/gcc/config/riscv/riscv-vector-builtins.cc
index 0df3cd15119..bd16fe9db7d 100644
--- a/gcc/config/riscv/riscv-vector-builtins.cc
+++ b/gcc/config/riscv/riscv-vector-builtins.cc
@@ -2130,6 +2130,13 @@ static CONSTEXPR const rvv_op_info p_none_void_ops
      rvv_arg_type_info (RVV_BASE_size), /* Return type */
      void_args /* Args */};
 
+/* A static operand information for unsigned long func () function registration. */
+static CONSTEXPR const rvv_op_info ul_none_void_ops
+  = {none_ops,				/* Types */
+     OP_TYPE_none,			/* Suffix */
+     rvv_arg_type_info (RVV_BASE_unsigned_long), /* Return type */
+     void_args /* Args */};
+
 /* A list of all RVV base function types.  */
 static CONSTEXPR const function_type_info function_types[] = {
 #define DEF_RVV_TYPE_INDEX(VECTOR, MASK, SIGNED, UNSIGNED, EEW8_INDEX, EEW16_INDEX, \
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/vlenb-1.c b/gcc/testsuite/gcc.target/riscv/rvv/base/vlenb-1.c
new file mode 100644
index 00000000000..a02fe9e98c4
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/vlenb-1.c
@@ -0,0 +1,46 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gcv -mabi=ilp32d -O3" } */
+
+#include "riscv_vector.h"
+
+void f0 (char *x, char * p1, char * p2, char * p3) {
+  vbool32_t bp1 = *(vbool32_t*)p1;
+  vbool32_t bp2 = *(vbool32_t*)p2;
+  vbool32_t bp3 = *(vbool32_t*)p3;
+  asm volatile ("":::"memory");
+  *(vbool32_t *)(x + (__riscv_vlenb())) = bp2;  
+  *(vbool32_t *)(x) = bp1;             
+  *(vbool32_t *)(x + (__riscv_vlenb())*2) = bp3;
+}
+
+void f1 (char *x, char * p1, char * p2, char * p3) {
+  vbool32_t bp1 = *(vbool32_t*)p1;
+  vbool32_t bp2 = *(vbool32_t*)p2;
+  vbool32_t bp3 = *(vbool32_t*)p3;
+  asm volatile ("":::"memory");
+  *(vbool32_t *)(x + (__riscv_vlenb() / 2)) = bp2;  
+  *(vbool32_t *)(x) = bp1;             
+  *(vbool32_t *)(x + (__riscv_vlenb() / 2)*2) = bp3;
+}
+
+void f2 (char *x, char * p1, char * p2, char * p3) {
+  vbool32_t bp1 = *(vbool32_t*)p1;
+  vbool32_t bp2 = *(vbool32_t*)p2;
+  vbool32_t bp3 = *(vbool32_t*)p3;
+  asm volatile ("":::"memory");
+  *(vbool32_t *)(x + (__riscv_vlenb() / 4)) = bp2;  
+  *(vbool32_t *)(x) = bp1;             
+  *(vbool32_t *)(x + (__riscv_vlenb() / 4)*2) = bp3;
+}
+
+void f3 (char *x, char * p1, char * p2, char * p3) {
+  vbool32_t bp1 = *(vbool32_t*)p1;
+  vbool32_t bp2 = *(vbool32_t*)p2;
+  vbool32_t bp3 = *(vbool32_t*)p3;
+  asm volatile ("":::"memory");
+  *(vbool32_t *)(x + (__riscv_vlenb() / 4)) = bp2;  
+  *(vbool32_t *)(x) = bp1;             
+  *(vbool32_t *)(x + (__riscv_vlenb() / 4)*2) = bp3;
+}
+
+/* { dg-final { scan-assembler-times {vsm\.v} 12 } } */
