diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index 2c67c818da5..690c384ff66 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -5167,6 +5167,34 @@ mode @var{n}.
 
 This pattern is not allowed to @code{FAIL}.
 
+@cindex @code{len_load_@var{m}} instruction pattern
+@item @samp{len_load_@var{m}}
+Load the number of units specified by operand 2 from memory operand 1
+into register operand 0, setting the other bytes of operand 0 to
+undefined values.  Operands 0 and 1 have mode @var{m}.  Operand 2 has
+whichever integer mode the target prefers.  If operand 2 exceeds the
+maximum units of mode @var{m}, it will be set to the maximum units of
+mode @var{m}.  For targets which support length measured in bytes,
+they should only define VnQI mode to wrap the other vector modes with
+the same size.  Meanwhile, it's required that the byte count should
+be a multiple of the element size (wrapped vector).
+
+This pattern is not allowed to @code{FAIL}.
+
+@cindex @code{len_store_@var{m}} instruction pattern
+@item @samp{len_store_@var{m}}
+Store the number of units specified by operand 2 from nonmemory operand 1
+into memory operand 0, leaving the other bytes of operand 0 unchanged.
+Operands 0 and 1 have mode @var{m}.  Operand 2 has whichever integer
+mode the target prefers.  If operand 2 exceeds the maximum units of mode
+@var{m}, it will be set to the maximum units of mode @var{m}.  For
+targets which support length measured in bytes, they should only define
+VnQI mode to wrap the other vector modes with the same size.  Meanwhile,
+it's required that the byte count should be a multiple of the element
+size (wrapped vector).
+
+This pattern is not allowed to @code{FAIL}.
+
 @cindex @code{vec_perm@var{m}} instruction pattern
 @item @samp{vec_perm@var{m}}
 Output a (variable) vector permutation.  Operand 0 is the destination
diff --git a/gcc/internal-fn.c b/gcc/internal-fn.c
index 4f088de48d5..1e53ced60eb 100644
--- a/gcc/internal-fn.c
+++ b/gcc/internal-fn.c
@@ -104,10 +104,12 @@ init_internal_fns ()
 #define load_lanes_direct { -1, -1, false }
 #define mask_load_lanes_direct { -1, -1, false }
 #define gather_load_direct { 3, 1, false }
+#define len_load_direct { -1, -1, false }
 #define mask_store_direct { 3, 2, false }
 #define store_lanes_direct { 0, 0, false }
 #define mask_store_lanes_direct { 0, 0, false }
 #define scatter_store_direct { 3, 1, false }
+#define len_store_direct { 3, 3, false }
 #define unary_direct { 0, 0, true }
 #define binary_direct { 0, 0, true }
 #define ternary_direct { 0, 0, true }
@@ -2478,10 +2480,10 @@ expand_call_mem_ref (tree type, gcall *stmt, int index)
   return fold_build2 (MEM_REF, type, addr, build_int_cst (alias_ptr_type, 0));
 }
 
-/* Expand MASK_LOAD{,_LANES} call STMT using optab OPTAB.  */
+/* Expand MASK_LOAD{,_LANES} or LEN_LOAD call STMT using optab OPTAB.  */
 
 static void
-expand_mask_load_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
+expand_partial_load_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
 {
   class expand_operand ops[3];
   tree type, lhs, rhs, maskt;
@@ -2497,6 +2499,8 @@ expand_mask_load_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
 
   if (optab == vec_mask_load_lanes_optab)
     icode = get_multi_vector_move (type, optab);
+  else if (optab == len_load_optab)
+    icode = direct_optab_handler (optab, TYPE_MODE (type));
   else
     icode = convert_optab_handler (optab, TYPE_MODE (type),
 				   TYPE_MODE (TREE_TYPE (maskt)));
@@ -2507,18 +2511,24 @@ expand_mask_load_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
   target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
   create_output_operand (&ops[0], target, TYPE_MODE (type));
   create_fixed_operand (&ops[1], mem);
-  create_input_operand (&ops[2], mask, TYPE_MODE (TREE_TYPE (maskt)));
+  if (optab == len_load_optab)
+    create_convert_operand_from (&ops[2], mask, TYPE_MODE (TREE_TYPE (maskt)),
+				 TYPE_UNSIGNED (TREE_TYPE (maskt)));
+  else
+    create_input_operand (&ops[2], mask, TYPE_MODE (TREE_TYPE (maskt)));
   expand_insn (icode, 3, ops);
   if (!rtx_equal_p (target, ops[0].value))
     emit_move_insn (target, ops[0].value);
 }
 
+#define expand_mask_load_optab_fn expand_partial_load_optab_fn
 #define expand_mask_load_lanes_optab_fn expand_mask_load_optab_fn
+#define expand_len_load_optab_fn expand_partial_load_optab_fn
 
-/* Expand MASK_STORE{,_LANES} call STMT using optab OPTAB.  */
+/* Expand MASK_STORE{,_LANES} or LEN_STORE call STMT using optab OPTAB.  */
 
 static void
-expand_mask_store_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
+expand_partial_store_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
 {
   class expand_operand ops[3];
   tree type, lhs, rhs, maskt;
@@ -2532,6 +2542,8 @@ expand_mask_store_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
 
   if (optab == vec_mask_store_lanes_optab)
     icode = get_multi_vector_move (type, optab);
+  else if (optab == len_store_optab)
+    icode = direct_optab_handler (optab, TYPE_MODE (type));
   else
     icode = convert_optab_handler (optab, TYPE_MODE (type),
 				   TYPE_MODE (TREE_TYPE (maskt)));
@@ -2542,11 +2554,17 @@ expand_mask_store_optab_fn (internal_fn, gcall *stmt, convert_optab optab)
   reg = expand_normal (rhs);
   create_fixed_operand (&ops[0], mem);
   create_input_operand (&ops[1], reg, TYPE_MODE (type));
-  create_input_operand (&ops[2], mask, TYPE_MODE (TREE_TYPE (maskt)));
+  if (optab == len_store_optab)
+    create_convert_operand_from (&ops[2], mask, TYPE_MODE (TREE_TYPE (maskt)),
+				 TYPE_UNSIGNED (TREE_TYPE (maskt)));
+  else
+    create_input_operand (&ops[2], mask, TYPE_MODE (TREE_TYPE (maskt)));
   expand_insn (icode, 3, ops);
 }
 
+#define expand_mask_store_optab_fn expand_partial_store_optab_fn
 #define expand_mask_store_lanes_optab_fn expand_mask_store_optab_fn
+#define expand_len_store_optab_fn expand_partial_store_optab_fn
 
 static void
 expand_ABNORMAL_DISPATCHER (internal_fn, gcall *)
@@ -3128,10 +3146,12 @@ multi_vector_optab_supported_p (convert_optab optab, tree_pair types,
 #define direct_load_lanes_optab_supported_p multi_vector_optab_supported_p
 #define direct_mask_load_lanes_optab_supported_p multi_vector_optab_supported_p
 #define direct_gather_load_optab_supported_p convert_optab_supported_p
+#define direct_len_load_optab_supported_p direct_optab_supported_p
 #define direct_mask_store_optab_supported_p convert_optab_supported_p
 #define direct_store_lanes_optab_supported_p multi_vector_optab_supported_p
 #define direct_mask_store_lanes_optab_supported_p multi_vector_optab_supported_p
 #define direct_scatter_store_optab_supported_p convert_optab_supported_p
+#define direct_len_store_optab_supported_p direct_optab_supported_p
 #define direct_while_optab_supported_p convert_optab_supported_p
 #define direct_fold_extract_optab_supported_p direct_optab_supported_p
 #define direct_fold_left_optab_supported_p direct_optab_supported_p
@@ -3498,6 +3518,7 @@ internal_load_fn_p (internal_fn fn)
     case IFN_MASK_LOAD_LANES:
     case IFN_GATHER_LOAD:
     case IFN_MASK_GATHER_LOAD:
+    case IFN_LEN_LOAD:
       return true;
 
     default:
@@ -3517,6 +3538,7 @@ internal_store_fn_p (internal_fn fn)
     case IFN_MASK_STORE_LANES:
     case IFN_SCATTER_STORE:
     case IFN_MASK_SCATTER_STORE:
+    case IFN_LEN_STORE:
       return true;
 
     default:
@@ -3577,6 +3599,7 @@ internal_fn_stored_value_index (internal_fn fn)
     case IFN_MASK_STORE:
     case IFN_SCATTER_STORE:
     case IFN_MASK_SCATTER_STORE:
+    case IFN_LEN_STORE:
       return 3;
 
     default:
diff --git a/gcc/internal-fn.def b/gcc/internal-fn.def
index 1d190d492ff..17dac128e83 100644
--- a/gcc/internal-fn.def
+++ b/gcc/internal-fn.def
@@ -49,11 +49,13 @@ along with GCC; see the file COPYING3.  If not see
    - load_lanes: currently just vec_load_lanes
    - mask_load_lanes: currently just vec_mask_load_lanes
    - gather_load: used for {mask_,}gather_load
+   - len_load: currently just len_load
 
    - mask_store: currently just maskstore
    - store_lanes: currently just vec_store_lanes
    - mask_store_lanes: currently just vec_mask_store_lanes
    - scatter_store: used for {mask_,}scatter_store
+   - len_store: currently just len_store
 
    - unary: a normal unary optab, such as vec_reverse_<mode>
    - binary: a normal binary optab, such as vec_interleave_lo_<mode>
@@ -127,6 +129,8 @@ DEF_INTERNAL_OPTAB_FN (GATHER_LOAD, ECF_PURE, gather_load, gather_load)
 DEF_INTERNAL_OPTAB_FN (MASK_GATHER_LOAD, ECF_PURE,
 		       mask_gather_load, gather_load)
 
+DEF_INTERNAL_OPTAB_FN (LEN_LOAD, ECF_PURE, len_load, len_load)
+
 DEF_INTERNAL_OPTAB_FN (SCATTER_STORE, 0, scatter_store, scatter_store)
 DEF_INTERNAL_OPTAB_FN (MASK_SCATTER_STORE, 0,
 		       mask_scatter_store, scatter_store)
@@ -136,6 +140,8 @@ DEF_INTERNAL_OPTAB_FN (STORE_LANES, ECF_CONST, vec_store_lanes, store_lanes)
 DEF_INTERNAL_OPTAB_FN (MASK_STORE_LANES, 0,
 		       vec_mask_store_lanes, mask_store_lanes)
 
+DEF_INTERNAL_OPTAB_FN (LEN_STORE, 0, len_store, len_store)
+
 DEF_INTERNAL_OPTAB_FN (WHILE_ULT, ECF_CONST | ECF_NOTHROW, while_ult, while)
 DEF_INTERNAL_OPTAB_FN (CHECK_RAW_PTRS, ECF_CONST | ECF_NOTHROW,
 		       check_raw_ptrs, check_ptrs)
diff --git a/gcc/optabs.def b/gcc/optabs.def
index 0c64eb52a8d..78409aa1453 100644
--- a/gcc/optabs.def
+++ b/gcc/optabs.def
@@ -435,3 +435,5 @@ OPTAB_D (check_war_ptrs_optab, "check_war_ptrs$a")
 OPTAB_DC (vec_duplicate_optab, "vec_duplicate$a", VEC_DUPLICATE)
 OPTAB_DC (vec_series_optab, "vec_series$a", VEC_SERIES)
 OPTAB_D (vec_shl_insert_optab, "vec_shl_insert_$a")
+OPTAB_D (len_load_optab, "len_load_$a")
+OPTAB_D (len_store_optab, "len_store_$a")
