diff --git a/target/arm/helper-a64.c b/target/arm/helper-a64.c
index 98b97df461..77999ff46b 100644
--- a/target/arm/helper-a64.c
+++ b/target/arm/helper-a64.c
@@ -54,11 +54,6 @@ int64_t HELPER(sdiv64)(int64_t num, int64_t den)
     return num / den;
 }
 
-uint64_t HELPER(clz64)(uint64_t x)
-{
-    return clz64(x);
-}
-
 uint64_t HELPER(cls64)(uint64_t x)
 {
     return clrsb64(x);
@@ -69,11 +64,6 @@ uint32_t HELPER(cls32)(uint32_t x)
     return clrsb32(x);
 }
 
-uint32_t HELPER(clz32)(uint32_t x)
-{
-    return clz32(x);
-}
-
 uint64_t HELPER(rbit64)(uint64_t x)
 {
     return revbit64(x);
diff --git a/target/arm/helper-a64.h b/target/arm/helper-a64.h
index dd32000e63..d320f96212 100644
--- a/target/arm/helper-a64.h
+++ b/target/arm/helper-a64.h
@@ -18,10 +18,8 @@
  */
 DEF_HELPER_FLAGS_2(udiv64, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(sdiv64, TCG_CALL_NO_RWG_SE, s64, s64, s64)
-DEF_HELPER_FLAGS_1(clz64, TCG_CALL_NO_RWG_SE, i64, i64)
 DEF_HELPER_FLAGS_1(cls64, TCG_CALL_NO_RWG_SE, i64, i64)
 DEF_HELPER_FLAGS_1(cls32, TCG_CALL_NO_RWG_SE, i32, i32)
-DEF_HELPER_FLAGS_1(clz32, TCG_CALL_NO_RWG_SE, i32, i32)
 DEF_HELPER_FLAGS_1(rbit64, TCG_CALL_NO_RWG_SE, i64, i64)
 DEF_HELPER_3(vfp_cmps_a64, i64, f32, f32, ptr)
 DEF_HELPER_3(vfp_cmpes_a64, i64, f32, f32, ptr)
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 8dcabbf576..77ea5e0025 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -5725,11 +5725,6 @@ uint32_t HELPER(uxtb16)(uint32_t x)
     return res;
 }
 
-uint32_t HELPER(clz)(uint32_t x)
-{
-    return clz32(x);
-}
-
 int32_t HELPER(sdiv)(int32_t num, int32_t den)
 {
     if (den == 0)
diff --git a/target/arm/helper.h b/target/arm/helper.h
index 84aa637629..df86bf7141 100644
--- a/target/arm/helper.h
+++ b/target/arm/helper.h
@@ -1,4 +1,3 @@
-DEF_HELPER_FLAGS_1(clz, TCG_CALL_NO_RWG_SE, i32, i32)
 DEF_HELPER_FLAGS_1(sxtb16, TCG_CALL_NO_RWG_SE, i32, i32)
 DEF_HELPER_FLAGS_1(uxtb16, TCG_CALL_NO_RWG_SE, i32, i32)
 
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index a59c90c9ad..1bf94bc6f6 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -3954,11 +3954,11 @@ static void handle_clz(DisasContext *s, unsigned int sf,
     tcg_rn = cpu_reg(s, rn);
 
     if (sf) {
-        gen_helper_clz64(tcg_rd, tcg_rn);
+        tcg_gen_clzi_i64(tcg_rd, tcg_rn, 64);
     } else {
         TCGv_i32 tcg_tmp32 = tcg_temp_new_i32();
         tcg_gen_extrl_i64_i32(tcg_tmp32, tcg_rn);
-        gen_helper_clz(tcg_tmp32, tcg_tmp32);
+        tcg_gen_clzi_i32(tcg_tmp32, tcg_tmp32, 32);
         tcg_gen_extu_i32_i64(tcg_rd, tcg_tmp32);
         tcg_temp_free_i32(tcg_tmp32);
     }
@@ -7591,7 +7591,7 @@ static void handle_2misc_64(DisasContext *s, int opcode, bool u,
     switch (opcode) {
     case 0x4: /* CLS, CLZ */
         if (u) {
-            gen_helper_clz64(tcg_rd, tcg_rn);
+            tcg_gen_clzi_i64(tcg_rd, tcg_rn, 64);
         } else {
             gen_helper_cls64(tcg_rd, tcg_rn);
         }
@@ -10261,7 +10261,7 @@ static void disas_simd_two_reg_misc(DisasContext *s, uint32_t insn)
                     goto do_cmop;
                 case 0x4: /* CLS */
                     if (u) {
-                        gen_helper_clz32(tcg_res, tcg_op);
+                        tcg_gen_clzi_i32(tcg_res, tcg_op, 32);
                     } else {
                         gen_helper_cls32(tcg_res, tcg_op);
                     }
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 08da9aceb6..c9186b6195 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -7037,7 +7037,7 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
                             switch (size) {
                             case 0: gen_helper_neon_clz_u8(tmp, tmp); break;
                             case 1: gen_helper_neon_clz_u16(tmp, tmp); break;
-                            case 2: gen_helper_clz(tmp, tmp); break;
+                            case 2: tcg_gen_clzi_i32(tmp, tmp, 32); break;
                             default: abort();
                             }
                             break;
@@ -8219,7 +8219,7 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
                 ARCH(5);
                 rd = (insn >> 12) & 0xf;
                 tmp = load_reg(s, rm);
-                gen_helper_clz(tmp, tmp);
+                tcg_gen_clzi_i32(tmp, tmp, 32);
                 store_reg(s, rd, tmp);
             } else {
                 goto illegal_op;
@@ -9992,7 +9992,7 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw
                     tcg_temp_free_i32(tmp2);
                     break;
                 case 0x18: /* clz */
-                    gen_helper_clz(tmp, tmp);
+                    tcg_gen_clzi_i32(tmp, tmp, 32);
                     break;
                 case 0x20:
                 case 0x21: