diff --git a/src/hotspot/cpu/riscv/macroAssembler_riscv.cpp b/src/hotspot/cpu/riscv/macroAssembler_riscv.cpp
index 0e6a9099265ce..61aea16acb278 100644
--- a/src/hotspot/cpu/riscv/macroAssembler_riscv.cpp
+++ b/src/hotspot/cpu/riscv/macroAssembler_riscv.cpp
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2014, 2020, Red Hat Inc. All rights reserved.
- * Copyright (c) 2020, 2023, Huawei Technologies Co., Ltd. All rights reserved.
+ * Copyright (c) 2020, 2024, Huawei Technologies Co., Ltd. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2495,6 +2495,51 @@ void MacroAssembler::encode_heap_oop(Register d, Register s) {
   }
 }
 
+void MacroAssembler::encode_heap_oop_not_null(Register r) {
+#ifdef ASSERT
+  if (CheckCompressedOops) {
+    Label ok;
+    bnez(r, ok);
+    stop("null oop passed to encode_heap_oop_not_null");
+    bind(ok);
+  }
+#endif
+  verify_oop_msg(r, "broken oop in encode_heap_oop_not_null");
+  if (CompressedOops::base() != nullptr) {
+    sub(r, r, xheapbase);
+  }
+  if (CompressedOops::shift() != 0) {
+    assert(LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
+    srli(r, r, LogMinObjAlignmentInBytes);
+  }
+}
+
+void MacroAssembler::encode_heap_oop_not_null(Register dst, Register src) {
+#ifdef ASSERT
+  if (CheckCompressedOops) {
+    Label ok;
+    bnez(src, ok);
+    stop("null oop passed to encode_heap_oop_not_null2");
+    bind(ok);
+  }
+#endif
+  verify_oop_msg(src, "broken oop in encode_heap_oop_not_null2");
+
+  Register data = src;
+  if (CompressedOops::base() != nullptr) {
+    sub(dst, src, xheapbase);
+    data = dst;
+  }
+  if (CompressedOops::shift() != 0) {
+    assert(LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
+    srli(dst, data, LogMinObjAlignmentInBytes);
+    data = dst;
+  }
+  if (data == src) {
+    mv(dst, src);
+  }
+}
+
 void MacroAssembler::load_klass(Register dst, Register src, Register tmp) {
   assert_different_registers(dst, tmp);
   assert_different_registers(src, tmp);
diff --git a/src/hotspot/cpu/riscv/macroAssembler_riscv.hpp b/src/hotspot/cpu/riscv/macroAssembler_riscv.hpp
index 4373ebada146a..a7fef792d6bea 100644
--- a/src/hotspot/cpu/riscv/macroAssembler_riscv.hpp
+++ b/src/hotspot/cpu/riscv/macroAssembler_riscv.hpp
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2014, 2020, Red Hat Inc. All rights reserved.
- * Copyright (c) 2020, 2023, Huawei Technologies Co., Ltd. All rights reserved.
+ * Copyright (c) 2020, 2024, Huawei Technologies Co., Ltd. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -206,6 +206,8 @@ class MacroAssembler: public Assembler {
   void decode_heap_oop_not_null(Register dst, Register src);
   void decode_heap_oop(Register d, Register s);
   void decode_heap_oop(Register r) { decode_heap_oop(r, r); }
+  void encode_heap_oop_not_null(Register r);
+  void encode_heap_oop_not_null(Register dst, Register src);
   void encode_heap_oop(Register d, Register s);
   void encode_heap_oop(Register r) { encode_heap_oop(r, r); };
   void load_heap_oop(Register dst, Address src, Register tmp1,
diff --git a/src/hotspot/cpu/riscv/riscv.ad b/src/hotspot/cpu/riscv/riscv.ad
index 4ed449032d6e9..2ee7f9df67ca6 100644
--- a/src/hotspot/cpu/riscv/riscv.ad
+++ b/src/hotspot/cpu/riscv/riscv.ad
@@ -1,7 +1,7 @@
 //
 // Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
 // Copyright (c) 2014, 2020, Red Hat Inc. All rights reserved.
-// Copyright (c) 2020, 2023, Huawei Technologies Co., Ltd. All rights reserved.
+// Copyright (c) 2020, 2024, Huawei Technologies Co., Ltd. All rights reserved.
 // DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 //
 // This code is free software; you can redistribute it and/or modify it
@@ -8404,6 +8404,7 @@ instruct round_float_reg(iRegINoSp dst, fRegF src, fRegF ftmp) %{
 
 // Convert oop pointer into compressed form
 instruct encodeHeapOop(iRegNNoSp dst, iRegP src) %{
+  predicate(n->bottom_type()->make_ptr()->ptr() != TypePtr::NotNull);
   match(Set dst (EncodeP src));
   ins_cost(ALU_COST);
   format %{ "encode_heap_oop  $dst, $src\t#@encodeHeapOop" %}
@@ -8415,6 +8416,17 @@ instruct encodeHeapOop(iRegNNoSp dst, iRegP src) %{
   ins_pipe(pipe_class_default);
 %}
 
+instruct encodeHeapOop_not_null(iRegNNoSp dst, iRegP src) {
+  predicate(n->bottom_type()->make_ptr()->ptr() == TypePtr::NotNull);
+  match(Set dst (EncodeP src));
+  ins_cost(ALU_COST);
+  format %{ "encode_heap_oop_not_null $dst, $src\t#@encodeHeapOop_not_null" %}
+  ins_encode %{
+    __ encode_heap_oop_not_null($dst$$Register, $src$$Register);
+  %}
+  ins_pipe(pipe_class_default);
+}
+
 instruct decodeHeapOop(iRegPNoSp dst, iRegN src) %{
   predicate(n->bottom_type()->is_ptr()->ptr() != TypePtr::NotNull &&
             n->bottom_type()->is_ptr()->ptr() != TypePtr::Constant);