diff --git a/tcg/riscv/tcg-target-con-set.h b/tcg/riscv/tcg-target-con-set.h
new file mode 100644
index 0000000000..cf0ac4d751
--- /dev/null
+++ b/tcg/riscv/tcg-target-con-set.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define RISC-V target-specific constraint sets.
+ * Copyright (c) 2021 Linaro
+ */
+
+/*
+ * C_On_Im(...) defines a constraint set with <n> outputs and <m> inputs.
+ * Each operand should be a sequence of constraint letters as defined by
+ * tcg-target-con-str.h; the constraint combination is inclusive or.
+ */
+C_O0_I1(r)
+C_O0_I2(LZ, L)
+C_O0_I2(rZ, r)
+C_O0_I2(rZ, rZ)
+C_O0_I3(LZ, L, L)
+C_O0_I3(LZ, LZ, L)
+C_O0_I4(LZ, LZ, L, L)
+C_O0_I4(rZ, rZ, rZ, rZ)
+C_O1_I1(r, L)
+C_O1_I1(r, r)
+C_O1_I2(r, L, L)
+C_O1_I2(r, r, ri)
+C_O1_I2(r, r, rI)
+C_O1_I2(r, rZ, rN)
+C_O1_I2(r, rZ, rZ)
+C_O1_I4(r, rZ, rZ, rZ, rZ)
+C_O2_I1(r, r, L)
+C_O2_I2(r, r, L, L)
+C_O2_I4(r, r, rZ, rZ, rM, rM)
diff --git a/tcg/riscv/tcg-target.h b/tcg/riscv/tcg-target.h
index 727c8df418..a998b951e4 100644
--- a/tcg/riscv/tcg-target.h
+++ b/tcg/riscv/tcg-target.h
@@ -171,5 +171,6 @@ void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
 #define TCG_TARGET_NEED_POOL_LABELS
 
 #define TCG_TARGET_HAS_MEMORY_BSWAP 0
+#define TCG_TARGET_CON_SET_H
 
 #endif
diff --git a/tcg/riscv/tcg-target.c.inc b/tcg/riscv/tcg-target.c.inc
index 20d5b5ef01..e700c52067 100644
--- a/tcg/riscv/tcg-target.c.inc
+++ b/tcg/riscv/tcg-target.c.inc
@@ -1543,50 +1543,11 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
     }
 }
 
-static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op)
+static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
 {
-    static const TCGTargetOpDef r
-        = { .args_ct_str = { "r" } };
-    static const TCGTargetOpDef r_r
-        = { .args_ct_str = { "r", "r" } };
-    static const TCGTargetOpDef rZ_r
-        = { .args_ct_str = { "rZ", "r" } };
-    static const TCGTargetOpDef rZ_rZ
-        = { .args_ct_str = { "rZ", "rZ" } };
-    static const TCGTargetOpDef rZ_rZ_rZ_rZ
-        = { .args_ct_str = { "rZ", "rZ", "rZ", "rZ" } };
-    static const TCGTargetOpDef r_r_ri
-        = { .args_ct_str = { "r", "r", "ri" } };
-    static const TCGTargetOpDef r_r_rI
-        = { .args_ct_str = { "r", "r", "rI" } };
-    static const TCGTargetOpDef r_rZ_rN
-        = { .args_ct_str = { "r", "rZ", "rN" } };
-    static const TCGTargetOpDef r_rZ_rZ
-        = { .args_ct_str = { "r", "rZ", "rZ" } };
-    static const TCGTargetOpDef r_rZ_rZ_rZ_rZ
-        = { .args_ct_str = { "r", "rZ", "rZ", "rZ", "rZ" } };
-    static const TCGTargetOpDef r_L
-        = { .args_ct_str = { "r", "L" } };
-    static const TCGTargetOpDef r_r_L
-        = { .args_ct_str = { "r", "r", "L" } };
-    static const TCGTargetOpDef r_L_L
-        = { .args_ct_str = { "r", "L", "L" } };
-    static const TCGTargetOpDef r_r_L_L
-        = { .args_ct_str = { "r", "r", "L", "L" } };
-    static const TCGTargetOpDef LZ_L
-        = { .args_ct_str = { "LZ", "L" } };
-    static const TCGTargetOpDef LZ_L_L
-        = { .args_ct_str = { "LZ", "L", "L" } };
-    static const TCGTargetOpDef LZ_LZ_L
-        = { .args_ct_str = { "LZ", "LZ", "L" } };
-    static const TCGTargetOpDef LZ_LZ_L_L
-        = { .args_ct_str = { "LZ", "LZ", "L", "L" } };
-    static const TCGTargetOpDef r_r_rZ_rZ_rM_rM
-        = { .args_ct_str = { "r", "r", "rZ", "rZ", "rM", "rM" } };
-
     switch (op) {
     case INDEX_op_goto_ptr:
-        return &r;
+        return C_O0_I1(r);
 
     case INDEX_op_ld8u_i32:
     case INDEX_op_ld8s_i32:
@@ -1618,7 +1579,7 @@ static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op)
     case INDEX_op_extrl_i64_i32:
     case INDEX_op_extrh_i64_i32:
     case INDEX_op_ext_i32_i64:
-        return &r_r;
+        return C_O1_I1(r, r);
 
     case INDEX_op_st8_i32:
     case INDEX_op_st16_i32:
@@ -1627,7 +1588,7 @@ static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op)
     case INDEX_op_st16_i64:
     case INDEX_op_st32_i64:
     case INDEX_op_st_i64:
-        return &rZ_r;
+        return C_O0_I2(rZ, r);
 
     case INDEX_op_add_i32:
     case INDEX_op_and_i32:
@@ -1637,11 +1598,11 @@ static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op)
     case INDEX_op_and_i64:
     case INDEX_op_or_i64:
     case INDEX_op_xor_i64:
-        return &r_r_rI;
+        return C_O1_I2(r, r, rI);
 
     case INDEX_op_sub_i32:
     case INDEX_op_sub_i64:
-        return &r_rZ_rN;
+        return C_O1_I2(r, rZ, rN);
 
     case INDEX_op_mul_i32:
     case INDEX_op_mulsh_i32:
@@ -1659,7 +1620,7 @@ static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op)
     case INDEX_op_rem_i64:
     case INDEX_op_remu_i64:
     case INDEX_op_setcond_i64:
-        return &r_rZ_rZ;
+        return C_O1_I2(r, rZ, rZ);
 
     case INDEX_op_shl_i32:
     case INDEX_op_shr_i32:
@@ -1667,39 +1628,41 @@ static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op)
     case INDEX_op_shl_i64:
     case INDEX_op_shr_i64:
     case INDEX_op_sar_i64:
-        return &r_r_ri;
+        return C_O1_I2(r, r, ri);
 
     case INDEX_op_brcond_i32:
     case INDEX_op_brcond_i64:
-        return &rZ_rZ;
+        return C_O0_I2(rZ, rZ);
 
     case INDEX_op_add2_i32:
     case INDEX_op_add2_i64:
     case INDEX_op_sub2_i32:
     case INDEX_op_sub2_i64:
-        return &r_r_rZ_rZ_rM_rM;
+        return C_O2_I4(r, r, rZ, rZ, rM, rM);
 
     case INDEX_op_brcond2_i32:
-        return &rZ_rZ_rZ_rZ;
+        return C_O0_I4(rZ, rZ, rZ, rZ);
 
     case INDEX_op_setcond2_i32:
-        return &r_rZ_rZ_rZ_rZ;
+        return C_O1_I4(r, rZ, rZ, rZ, rZ);
 
     case INDEX_op_qemu_ld_i32:
-        return TARGET_LONG_BITS <= TCG_TARGET_REG_BITS ? &r_L : &r_L_L;
+        return (TARGET_LONG_BITS <= TCG_TARGET_REG_BITS
+                ? C_O1_I1(r, L) : C_O1_I2(r, L, L));
     case INDEX_op_qemu_st_i32:
-        return TARGET_LONG_BITS <= TCG_TARGET_REG_BITS ? &LZ_L : &LZ_L_L;
+        return (TARGET_LONG_BITS <= TCG_TARGET_REG_BITS
+                ? C_O0_I2(LZ, L) : C_O0_I3(LZ, L, L));
     case INDEX_op_qemu_ld_i64:
-        return TCG_TARGET_REG_BITS == 64 ? &r_L
-               : TARGET_LONG_BITS <= TCG_TARGET_REG_BITS ? &r_r_L
-               : &r_r_L_L;
+        return (TCG_TARGET_REG_BITS == 64 ? C_O1_I1(r, L)
+               : TARGET_LONG_BITS <= TCG_TARGET_REG_BITS ? C_O2_I1(r, r, L)
+               : C_O2_I2(r, r, L, L));
     case INDEX_op_qemu_st_i64:
-        return TCG_TARGET_REG_BITS == 64 ? &LZ_L
-               : TARGET_LONG_BITS <= TCG_TARGET_REG_BITS ? &LZ_LZ_L
-               : &LZ_LZ_L_L;
+        return (TCG_TARGET_REG_BITS == 64 ? C_O0_I2(LZ, L)
+               : TARGET_LONG_BITS <= TCG_TARGET_REG_BITS ? C_O0_I3(LZ, LZ, L)
+               : C_O0_I4(LZ, LZ, L, L));
 
     default:
-        return NULL;
+        g_assert_not_reached();
     }
 }
 
