diff --git a/gcc/config/aarch64/aarch64-protos.h b/gcc/config/aarch64/aarch64-protos.h
index caf1d2041f0..3d045cf43be 100644
--- a/gcc/config/aarch64/aarch64-protos.h
+++ b/gcc/config/aarch64/aarch64-protos.h
@@ -562,7 +562,6 @@ rtx aarch64_load_tp (rtx);
 
 void aarch64_expand_compare_and_swap (rtx op[]);
 void aarch64_split_compare_and_swap (rtx op[]);
-void aarch64_gen_atomic_cas (rtx, rtx, rtx, rtx, rtx);
 
 bool aarch64_atomic_ldop_supported_p (enum rtx_code);
 void aarch64_gen_atomic_ldop (enum rtx_code, rtx, rtx, rtx, rtx, rtx);
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 12f7dfe9a75..a0ba358c2f1 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -14174,7 +14174,7 @@ aarch64_expand_compare_and_swap (rtx operands[])
     case E_SImode:
     case E_DImode:
       /* Force the value into a register if needed.  */
-      if (!aarch64_plus_operand (oldval, mode))
+      if (TARGET_LSE || !aarch64_plus_operand (oldval, mode))
 	oldval = force_reg (cmp_mode, oldval);
       break;
 
@@ -14183,16 +14183,20 @@ aarch64_expand_compare_and_swap (rtx operands[])
     }
 
   if (TARGET_LSE)
-    emit_insn (gen_aarch64_compare_and_swap_lse (mode, rval, mem, oldval,
-						 newval, is_weak, mod_s,
-						 mod_f));
+    {
+      if (reg_overlap_mentioned_p (rval, oldval))
+        rval = gen_reg_rtx (cmp_mode);
+      emit_insn (gen_aarch64_compare_and_swap_lse (mode, rval, mem, oldval,
+						   newval, mod_s));
+      aarch64_gen_compare_reg (EQ, rval, oldval);
+    }
   else
     emit_insn (gen_aarch64_compare_and_swap (mode, rval, mem, oldval, newval,
 					     is_weak, mod_s, mod_f));
 
-
   if (mode == QImode || mode == HImode)
-    emit_move_insn (operands[1], gen_lowpart (mode, rval));
+    rval = gen_lowpart (mode, rval);
+  emit_move_insn (operands[1], rval);
 
   x = gen_rtx_REG (CCmode, CC_REGNUM);
   x = gen_rtx_EQ (SImode, x, const0_rtx);
@@ -14242,31 +14246,6 @@ aarch64_emit_post_barrier (enum memmodel model)
     }
 }
 
-/* Emit an atomic compare-and-swap operation.  RVAL is the destination register
-   for the data in memory.  EXPECTED is the value expected to be in memory.
-   DESIRED is the value to store to memory.  MEM is the memory location.  MODEL
-   is the memory ordering to use.  */
-
-void
-aarch64_gen_atomic_cas (rtx rval, rtx mem,
-			rtx expected, rtx desired,
-			rtx model)
-{
-  machine_mode mode;
-
-  mode = GET_MODE (mem);
-
-  /* Move the expected value into the CAS destination register.  */
-  emit_insn (gen_rtx_SET (rval, expected));
-
-  /* Emit the CAS.  */
-  emit_insn (gen_aarch64_atomic_cas (mode, rval, mem, desired, model));
-
-  /* Compare the expected value with the value loaded by the CAS, to establish
-     whether the swap was made.  */
-  aarch64_gen_compare_reg (EQ, rval, expected);
-}
-
 /* Split a compare and swap pattern.  */
 
 void
diff --git a/gcc/config/aarch64/atomics.md b/gcc/config/aarch64/atomics.md
index bba8e9e9c8e..9f00dd3c68e 100644
--- a/gcc/config/aarch64/atomics.md
+++ b/gcc/config/aarch64/atomics.md
@@ -85,56 +85,50 @@
   }
 )
 
-(define_insn_and_split "@aarch64_compare_and_swap<mode>_lse"
-  [(set (reg:CC CC_REGNUM)					;; bool out
-    (unspec_volatile:CC [(const_int 0)] UNSPECV_ATOMIC_CMPSW))
-   (set (match_operand:SI 0 "register_operand" "=&r")		;; val out
+(define_insn "@aarch64_compare_and_swap<mode>_lse"
+  [(set (match_operand:SI 0 "register_operand" "=r")		;; val out
     (zero_extend:SI
-      (match_operand:SHORT 1 "aarch64_sync_memory_operand" "+Q"))) ;; memory
+     (match_operand:SHORT 1 "aarch64_sync_memory_operand" "+Q"))) ;; memory
    (set (match_dup 1)
     (unspec_volatile:SHORT
-      [(match_operand:SI 2 "aarch64_plus_operand" "rI")	;; expected
+      [(match_operand:SI 2 "register_operand" "0")		;; expected
        (match_operand:SHORT 3 "aarch64_reg_or_zero" "rZ")	;; desired
-       (match_operand:SI 4 "const_int_operand")		;; is_weak
-       (match_operand:SI 5 "const_int_operand")		;; mod_s
-       (match_operand:SI 6 "const_int_operand")]	;; mod_f
+       (match_operand:SI 4 "const_int_operand")]		;; mod_s
       UNSPECV_ATOMIC_CMPSW))]
   "TARGET_LSE"
-  "#"
-  "&& reload_completed"
-  [(const_int 0)]
-  {
-    aarch64_gen_atomic_cas (operands[0], operands[1],
-			    operands[2], operands[3],
-			    operands[5]);
-    DONE;
-  }
-)
+{
+  enum memmodel model = memmodel_from_int (INTVAL (operands[4]));
+  if (is_mm_relaxed (model))
+    return "cas<atomic_sfx>\t%<w>0, %<w>3, %1";
+  else if (is_mm_acquire (model) || is_mm_consume (model))
+    return "casa<atomic_sfx>\t%<w>0, %<w>3, %1";
+  else if (is_mm_release (model))
+    return "casl<atomic_sfx>\t%<w>0, %<w>3, %1";
+  else
+    return "casal<atomic_sfx>\t%<w>0, %<w>3, %1";
+})
 
-(define_insn_and_split "@aarch64_compare_and_swap<mode>_lse"
-  [(set (reg:CC CC_REGNUM)					;; bool out
-    (unspec_volatile:CC [(const_int 0)] UNSPECV_ATOMIC_CMPSW))
-   (set (match_operand:GPI 0 "register_operand" "=&r")		;; val out
+(define_insn "@aarch64_compare_and_swap<mode>_lse"
+  [(set (match_operand:GPI 0 "register_operand" "=r")		;; val out
     (match_operand:GPI 1 "aarch64_sync_memory_operand" "+Q"))   ;; memory
    (set (match_dup 1)
     (unspec_volatile:GPI
-      [(match_operand:GPI 2 "aarch64_plus_operand" "rI")	;; expect
+      [(match_operand:GPI 2 "register_operand" "0")		;; expect
        (match_operand:GPI 3 "aarch64_reg_or_zero" "rZ")		;; desired
-       (match_operand:SI 4 "const_int_operand")			;; is_weak
-       (match_operand:SI 5 "const_int_operand")			;; mod_s
-       (match_operand:SI 6 "const_int_operand")]		;; mod_f
+       (match_operand:SI 4 "const_int_operand")]		;; mod_s
       UNSPECV_ATOMIC_CMPSW))]
   "TARGET_LSE"
-  "#"
-  "&& reload_completed"
-  [(const_int 0)]
-  {
-    aarch64_gen_atomic_cas (operands[0], operands[1],
-			    operands[2], operands[3],
-			    operands[5]);
-    DONE;
-  }
-)
+{
+  enum memmodel model = memmodel_from_int (INTVAL (operands[4]));
+  if (is_mm_relaxed (model))
+    return "cas<atomic_sfx>\t%<w>0, %<w>3, %1";
+  else if (is_mm_acquire (model) || is_mm_consume (model))
+    return "casa<atomic_sfx>\t%<w>0, %<w>3, %1";
+  else if (is_mm_release (model))
+    return "casl<atomic_sfx>\t%<w>0, %<w>3, %1";
+  else
+    return "casal<atomic_sfx>\t%<w>0, %<w>3, %1";
+})
 
 (define_expand "atomic_exchange<mode>"
  [(match_operand:ALLI 0 "register_operand" "")
@@ -610,55 +604,6 @@
       return "swpal<atomic_sfx>\t%<w>2, %<w>0, %1";
   })
 
-;; Atomic compare-and-swap: HI and smaller modes.
-
-(define_insn "@aarch64_atomic_cas<mode>"
- [(set (match_operand:SI 0 "register_operand" "+&r")		  ;; out
-   (zero_extend:SI
-    (match_operand:SHORT 1 "aarch64_sync_memory_operand" "+Q")))  ;; memory.
-  (set (match_dup 1)
-   (unspec_volatile:SHORT
-    [(match_dup 0)
-     (match_operand:SHORT 2 "aarch64_reg_or_zero" "rZ")	;; value.
-     (match_operand:SI 3 "const_int_operand" "")]	;; model.
-    UNSPECV_ATOMIC_CAS))]
- "TARGET_LSE && reload_completed"
-{
-  enum memmodel model = memmodel_from_int (INTVAL (operands[3]));
-  if (is_mm_relaxed (model))
-    return "cas<atomic_sfx>\t%<w>0, %<w>2, %1";
-  else if (is_mm_acquire (model) || is_mm_consume (model))
-    return "casa<atomic_sfx>\t%<w>0, %<w>2, %1";
-  else if (is_mm_release (model))
-    return "casl<atomic_sfx>\t%<w>0, %<w>2, %1";
-  else
-    return "casal<atomic_sfx>\t%<w>0, %<w>2, %1";
-})
-
-;; Atomic compare-and-swap: SI and larger modes.
-
-(define_insn "@aarch64_atomic_cas<mode>"
- [(set (match_operand:GPI 0 "register_operand" "+&r")	      ;; out
-   (match_operand:GPI 1 "aarch64_sync_memory_operand" "+Q"))  ;; memory.
-  (set (match_dup 1)
-   (unspec_volatile:GPI
-    [(match_dup 0)
-     (match_operand:GPI 2 "aarch64_reg_or_zero" "rZ")	;; value.
-     (match_operand:SI 3 "const_int_operand" "")]	;; model.
-    UNSPECV_ATOMIC_CAS))]
-  "TARGET_LSE && reload_completed"
-{
-    enum memmodel model = memmodel_from_int (INTVAL (operands[3]));
-    if (is_mm_relaxed (model))
-      return "cas<atomic_sfx>\t%<w>0, %<w>2, %1";
-    else if (is_mm_acquire (model) || is_mm_consume (model))
-      return "casa<atomic_sfx>\t%<w>0, %<w>2, %1";
-    else if (is_mm_release (model))
-      return "casl<atomic_sfx>\t%<w>0, %<w>2, %1";
-    else
-      return "casal<atomic_sfx>\t%<w>0, %<w>2, %1";
-})
-
 ;; Atomic load-op: Load data, operate, store result, keep data.
 
 (define_insn "@aarch64_atomic_load<atomic_ldop><mode>"
