diff --git a/src/mono/mono/arch/arm64/arm64-codegen.h b/src/mono/mono/arch/arm64/arm64-codegen.h
index 154fd10d85f633..0834a24ad635e1 100644
--- a/src/mono/mono/arch/arm64/arm64-codegen.h
+++ b/src/mono/mono/arch/arm64/arm64-codegen.h
@@ -1047,6 +1047,7 @@ arm_encode_arith_imm (int imm, guint32 *shift)
 
 /* NEON :: move SIMD register*/
 #define arm_neon_mov(p, rd, rn) arm_neon_orr ((p), VREG_FULL, (rd), (rn), (rn))
+#define arm_neon_mov_8b(p, rd, rn) arm_neon_orr ((p), VREG_LOW, (rd), (rn), (rn))
 
 /* NEON :: AES */ 
 #define arm_neon_aes_opcode(p, size, opcode, rd, rn) arm_neon_opcode_2reg ((p), VREG_FULL, 0b00001110001010000000100000000000 | (size) << 22 | (opcode) << 12, (rd), (rn))
diff --git a/src/mono/mono/mini/cpu-arm64.mdesc b/src/mono/mono/mini/cpu-arm64.mdesc
index 57e31d0561effd..2479dd0d22d62b 100644
--- a/src/mono/mono/mini/cpu-arm64.mdesc
+++ b/src/mono/mono/mini/cpu-arm64.mdesc
@@ -558,6 +558,11 @@ arm64_ext_imm: dest:x src1:x src2:x len:4
 xinsert_i8: dest:x src1:x src2:i src3:i len:20
 xinsert_r8: dest:x src1:x src2:f src3:i len:20
 arm64_broadcast_elem: dest:x src1:x len:16
+xconcat: dest:x src1:x src2:x len:8 clob:1
+xlower: dest:x src1:x len:8
+xupper: dest:x src1:x len:8
+xinsert_lower: dest:x src1:x src2:x len:8 clob:1
+xinsert_upper: dest:x src1:x src2:x len:8 clob:1
 
 generic_class_init: src1:a len:44 clob:c
 gc_safe_point: src1:i len:12 clob:c
diff --git a/src/mono/mono/mini/mini-arm64.c b/src/mono/mono/mini/mini-arm64.c
index 491f02f6e4044b..0bd13dbe798115 100644
--- a/src/mono/mono/mini/mini-arm64.c
+++ b/src/mono/mono/mini/mini-arm64.c
@@ -4085,7 +4085,7 @@ mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
 		}
 		case OP_CREATE_SCALAR_UNSAFE_INT: {
 			const int t = get_type_size_macro (ins->inst_c1);
-			arm_neon_ins_g(code, t, dreg, sreg1, 0);
+			arm_neon_ins_g (code, t, dreg, sreg1, 0);
 			break;
 		}
 		case OP_CREATE_SCALAR_UNSAFE_FLOAT: {
@@ -4099,14 +4099,17 @@ mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
 					t = SIZE_8;
 					break;
 				}
-				arm_neon_ins_e(code, t, dreg, sreg1, 0, 0);
+				arm_neon_ins_e (code, t, dreg, sreg1, 0, 0);
 			}
 			break;
 		}
-		// This requires Vector64 SIMD support
-		// case OP_XCONCAT:
-		// 	arm_neon_ext_16b(code, dreg, sreg1, sreg2, 8);
-		// 	break;
+		case OP_XCONCAT: {
+			if (dreg != sreg1)
+				arm_neon_mov (code, dreg, sreg1);
+
+			arm_neon_ins_e (code, SIZE_8, dreg, sreg2, 1, 0); 
+		 	break;
+		}
 		case OP_ARM64_USHL: {
 			arm_neon_ushl (code, get_vector_size_macro (ins), get_type_size_macro (ins->inst_c1), dreg, sreg1, sreg2);
 			break;
@@ -4118,6 +4121,33 @@ mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
 				arm_neon_ext_16b (code, dreg, sreg1, sreg2, ins->inst_c0);
 			break;
 		}
+		case OP_XLOWER: {
+			if (dreg == sreg1) {
+				// clean the upper half
+				arm_neon_eor (code, VREG_FULL, NEON_TMP_REG, NEON_TMP_REG, NEON_TMP_REG);
+				arm_neon_ins_e (code, SIZE_8, dreg, NEON_TMP_REG, 1, 0); 
+			} else {
+				arm_neon_eor (code, VREG_FULL, dreg, dreg, dreg);
+				arm_neon_mov_8b (code, dreg, sreg1);
+			}
+			break;
+		}
+		case OP_XUPPER:
+			// shift in 64 zeros from the left
+			arm_neon_eor (code, VREG_FULL, NEON_TMP_REG, NEON_TMP_REG, NEON_TMP_REG);
+			arm_neon_ext_16b (code, dreg, sreg1, NEON_TMP_REG, 8);
+			break;
+	
+		case OP_XINSERT_LOWER:
+		case OP_XINSERT_UPPER: {
+			if (dreg != sreg1)
+				arm_neon_mov (code, dreg, sreg1);
+
+			int insert_at = (ins->opcode == OP_XINSERT_LOWER) ? 0 : 1;
+			arm_neon_ins_e (code, SIZE_8, dreg, sreg2, insert_at, 0);
+			break;
+		}
+
 		/* BRANCH */
 		case OP_BR:
 			mono_add_patch_info_rel (cfg, offset, MONO_PATCH_INFO_BB, ins->inst_target_bb, MONO_R_ARM64_B);
diff --git a/src/mono/mono/mini/simd-intrinsics.c b/src/mono/mono/mini/simd-intrinsics.c
index dca9ccbd73ccc3..733591a5ab421c 100644
--- a/src/mono/mono/mini/simd-intrinsics.c
+++ b/src/mono/mono/mini/simd-intrinsics.c
@@ -1201,6 +1201,8 @@ static guint16 sri_vector_methods [] = {
 	SN_WidenLower,
 	SN_WidenUpper,
 	SN_WithElement,
+	SN_WithLower,
+	SN_WithUpper,
 	SN_Xor,
 	SN_get_IsHardwareAccelerated,
 };
@@ -1382,14 +1384,7 @@ emit_sri_vector (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsi
 	if (!COMPILE_LLVM (cfg)) {
 		if (vector_size != 128)
 			return NULL;
-		switch (id) {
-		case SN_GetLower:
-		case SN_GetUpper:
-			return NULL;
-		default:
-			break;
 		}
-	}
 #endif
 
 #ifdef TARGET_WASM
@@ -1662,11 +1657,6 @@ emit_sri_vector (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsi
 			ins->inst_c1 = arg0_type;
 			return ins;
 		} else if (is_create_from_half_vectors_overload (fsig)) {
-#if defined(TARGET_ARM64)
-			// Require Vector64 SIMD support
-			if (!COMPILE_LLVM (cfg))
-				return NULL;
-#endif
 #if defined(TARGET_AMD64)
 			// Require Vector64 SIMD support
 			if (!COMPILE_LLVM (cfg))
@@ -1929,10 +1919,9 @@ emit_sri_vector (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsi
 
 #ifdef TARGET_AMD64
 		if (!COMPILE_LLVM (cfg))
-			/* These return a Vector64 */
+		  /* These return a Vector64 */
 			return NULL;
 #endif
-
 		return emit_simd_ins_for_sig (cfg, klass, op, 0, arg0_type, fsig, args);
 	}
 	case SN_GreaterThan:
@@ -2304,9 +2293,15 @@ emit_sri_vector (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSignature *fsi
 	}
 	case SN_WithLower:
 	case SN_WithUpper: {
+#ifdef TARGET_AMD64
+		if (!COMPILE_LLVM (cfg))
+		  /* These return a Vector64 */
+			return NULL;
+#endif
+
 		if (!is_element_type_primitive (fsig->params [0]))
 			return NULL;
-		int op = id == SN_GetLower ? OP_XINSERT_LOWER : OP_XINSERT_UPPER;
+		int op = id == SN_WithLower ? OP_XINSERT_LOWER : OP_XINSERT_UPPER;
 		return emit_simd_ins_for_sig (cfg, klass, op, 0, arg0_type, fsig, args);
 	}
 	default: