diff --git a/target/arm/helper-a64.c b/target/arm/helper-a64.c
index 77999ff46b..d9df82cff5 100644
--- a/target/arm/helper-a64.c
+++ b/target/arm/helper-a64.c
@@ -54,16 +54,6 @@ int64_t HELPER(sdiv64)(int64_t num, int64_t den)
     return num / den;
 }
 
-uint64_t HELPER(cls64)(uint64_t x)
-{
-    return clrsb64(x);
-}
-
-uint32_t HELPER(cls32)(uint32_t x)
-{
-    return clrsb32(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 d320f96212..6f9eaba533 100644
--- a/target/arm/helper-a64.h
+++ b/target/arm/helper-a64.h
@@ -18,8 +18,6 @@
  */
 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(cls64, TCG_CALL_NO_RWG_SE, i64, i64)
-DEF_HELPER_FLAGS_1(cls32, 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/translate-a64.c b/target/arm/translate-a64.c
index 1bf94bc6f6..4f09dfb95a 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -3972,11 +3972,11 @@ static void handle_cls(DisasContext *s, unsigned int sf,
     tcg_rn = cpu_reg(s, rn);
 
     if (sf) {
-        gen_helper_cls64(tcg_rd, tcg_rn);
+        tcg_gen_clrsb_i64(tcg_rd, tcg_rn);
     } else {
         TCGv_i32 tcg_tmp32 = tcg_temp_new_i32();
         tcg_gen_extrl_i64_i32(tcg_tmp32, tcg_rn);
-        gen_helper_cls32(tcg_tmp32, tcg_tmp32);
+        tcg_gen_clrsb_i32(tcg_tmp32, tcg_tmp32);
         tcg_gen_extu_i32_i64(tcg_rd, tcg_tmp32);
         tcg_temp_free_i32(tcg_tmp32);
     }
@@ -7593,7 +7593,7 @@ static void handle_2misc_64(DisasContext *s, int opcode, bool u,
         if (u) {
             tcg_gen_clzi_i64(tcg_rd, tcg_rn, 64);
         } else {
-            gen_helper_cls64(tcg_rd, tcg_rn);
+            tcg_gen_clrsb_i64(tcg_rd, tcg_rn);
         }
         break;
     case 0x5: /* NOT */
@@ -10263,7 +10263,7 @@ static void disas_simd_two_reg_misc(DisasContext *s, uint32_t insn)
                     if (u) {
                         tcg_gen_clzi_i32(tcg_res, tcg_op, 32);
                     } else {
-                        gen_helper_cls32(tcg_res, tcg_op);
+                        tcg_gen_clrsb_i32(tcg_res, tcg_op);
                     }
                     break;
                 case 0x7: /* SQABS, SQNEG */