diff --git a/tcg/riscv/tcg-target.inc.c b/tcg/riscv/tcg-target.inc.c
index 01b4443d6d..48399480b2 100644
--- a/tcg/riscv/tcg-target.inc.c
+++ b/tcg/riscv/tcg-target.inc.c
@@ -596,3 +596,37 @@ static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd,
     tcg_out_opc_upper(s, OPC_AUIPC, rd, 0);
     tcg_out_opc_imm(s, OPC_LD, rd, rd, 0);
 }
+
+static void tcg_out_ext8u(TCGContext *s, TCGReg ret, TCGReg arg)
+{
+    tcg_out_opc_imm(s, OPC_ANDI, ret, arg, 0xff);
+}
+
+static void tcg_out_ext16u(TCGContext *s, TCGReg ret, TCGReg arg)
+{
+    tcg_out_opc_imm(s, OPC_SLLIW, ret, arg, 16);
+    tcg_out_opc_imm(s, OPC_SRLIW, ret, ret, 16);
+}
+
+static void tcg_out_ext32u(TCGContext *s, TCGReg ret, TCGReg arg)
+{
+    tcg_out_opc_imm(s, OPC_SLLI, ret, arg, 32);
+    tcg_out_opc_imm(s, OPC_SRLI, ret, ret, 32);
+}
+
+static void tcg_out_ext8s(TCGContext *s, TCGReg ret, TCGReg arg)
+{
+    tcg_out_opc_imm(s, OPC_SLLIW, ret, arg, 24);
+    tcg_out_opc_imm(s, OPC_SRAIW, ret, ret, 24);
+}
+
+static void tcg_out_ext16s(TCGContext *s, TCGReg ret, TCGReg arg)
+{
+    tcg_out_opc_imm(s, OPC_SLLIW, ret, arg, 16);
+    tcg_out_opc_imm(s, OPC_SRAIW, ret, ret, 16);
+}
+
+static void tcg_out_ext32s(TCGContext *s, TCGReg ret, TCGReg arg)
+{
+    tcg_out_opc_imm(s, OPC_ADDIW, ret, arg, 0);
+}