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; Copyright (C) 2012-2013 Free Software Foundation, Inc.
; Contributed by Red Hat.
;
; This file is free software; you can redistribute it and/or modify it
; under the terms of the GNU General Public License as published by the
; Free Software Foundation; either version 3, or (at your option) any
; later version.
;
; This file is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; Under Section 7 of GPL version 3, you are granted additional
; permissions described in the GCC Runtime Library Exception, version
; 3.1, as published by the Free Software Foundation.
;
; You should have received a copy of the GNU General Public License and
; a copy of the GCC Runtime Library Exception along with this program;
; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
; <http://www.gnu.org/licenses/>.
#ifdef __MSP430X_LARGE__
#define ret_ RETA
#else
#define ret_ RET
#endif
.text
;; int __cmpsi2 (signed long A, signed long B)
;;
;; Performs a signed comparison of A and B.
;; If A is less than B it returns 0. If A is greater
;; than B it returns 2. If they are equal it returns 1.
;; Note - this code is also used by the __ucmpsi2 routine below.
.global __cmpsi2
.type __cmpsi2, @function
__cmpsi2:
;; A is in r12 (low), r13 (high)
;; B is in r14 (low), r15 (high)
;; Result put in r12
cmp.w r13, r15
jeq .L_compare_low
jge .L_less_than
.L_greater_than:
mov.w #2, r12
ret_
.L_less_than:
mov.w #0, r12
ret_
.L_compare_low:
cmp.w r12, r14
jl .L_greater_than
jne .L_less_than
mov.w #1, r12
ret_
.size __cmpsi2, . - __cmpsi2
;; int __ucmpsi2 (unsigned long A, unsigned long B)
;;
;; Performs an unsigned comparison of A and B.
;; If A is less than B it returns 0. If A is greater
;; than B it returns 2. If they are equal it returns 1.
;;; Note - this function branches into the __cmpsi2 code above.
.global __ucmpsi2
.type __ucmpsi2, @function
__ucmpsi2:
;; A is in r12 (low), r13 (high)
;; B is in r14 (low), r15 (high)
;; Result put in r12
tst r13
jn .L_top_bit_set_in_A
tst r15
;;; If the top bit of B is set, but A's is clear we know that A < B.
jn .L_less_than
;;; Neither A nor B has their top bit set so we can use the __cmpsi2 routine.
;;; Note we use Jc rather than BR as that saves two bytes. The TST insn always
;;; sets the C bit.
jc __cmpsi2
.L_top_bit_set_in_A:
tst r15
;;; If both A and B have their top bit set we can use the __cmpsi2 routine.
jn __cmpsi2
;;; Otherwise A has its top bit set and B does not so A > B.
jc .L_greater_than
.size __ucmpsi2, . - __ucmpsi2
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