99 lines
2.7 KiB
ArmAsm
99 lines
2.7 KiB
ArmAsm
; Copyright (C) 2012-2016 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
|