diff --git a/gcc/config/aarch64/aarch64-protos.h b/gcc/config/aarch64/aarch64-protos.h
index 367253b..9c9f046 100644
--- a/gcc/config/aarch64/aarch64-protos.h
+++ b/gcc/config/aarch64/aarch64-protos.h
@@ -252,6 +252,8 @@ void aarch64_print_operand (FILE *, rtx, char);
 void aarch64_print_operand_address (FILE *, rtx);
 void aarch64_emit_call_insn (rtx);
 
+bool aarch64_uimm5 (HOST_WIDE_INT);
+
 /* Initialize builtins for SIMD intrinsics.  */
 void init_aarch64_simd_builtins (void);
 
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 15c7be6..3a797dc 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -9754,6 +9754,13 @@ aarch64_expand_movmem (rtx *operands)
   return true;
 }
 
+/* Return true if val can be encoded as a 5-bit unsigned immediate.  */
+bool
+aarch64_uimm5 (HOST_WIDE_INT val)
+{
+  return (val & (HOST_WIDE_INT) 0x1f) == val;
+}
+
 #undef TARGET_ADDRESS_COST
 #define TARGET_ADDRESS_COST aarch64_address_cost
 
diff --git a/gcc/config/aarch64/constraints.md b/gcc/config/aarch64/constraints.md
index 807d0b1..bb6a8a1 100644
--- a/gcc/config/aarch64/constraints.md
+++ b/gcc/config/aarch64/constraints.md
@@ -89,6 +89,11 @@
   (and (match_code "const_int")
        (match_test "(unsigned HOST_WIDE_INT) ival < 32")))
 
+(define_constraint "Usn"
+ "A constant that can be used with a CCMN operation (once negated)."
+ (and (match_code "const_int")
+      (match_test "aarch64_uimm5 (-ival)")))
+
 (define_constraint "Usd"
   "@internal
   A constraint that matches an immediate shift constant in DImode."
diff --git a/gcc/config/aarch64/predicates.md b/gcc/config/aarch64/predicates.md
index 8191169..86f6cc1 100644
--- a/gcc/config/aarch64/predicates.md
+++ b/gcc/config/aarch64/predicates.md
@@ -30,6 +30,15 @@
   (ior (match_code "symbol_ref")
        (match_operand 0 "register_operand")))
 
+(define_predicate "aarch64_ccmp_immediate"
+  (and (match_code "const_int")
+       (ior (match_test "aarch64_uimm5 (INTVAL (op))")
+	    (match_test "aarch64_uimm5 (-INTVAL (op))"))))
+
+(define_predicate "aarch64_ccmp_operand"
+  (ior (match_operand 0 "register_operand")
+       (match_operand 0 "aarch64_ccmp_immediate")))
+
 (define_predicate "aarch64_simd_register"
   (and (match_code "reg")
        (ior (match_test "REGNO_REG_CLASS (REGNO (op)) == FP_LO_REGS")