99 lines
2.7 KiB
ArmAsm
99 lines
2.7 KiB
ArmAsm
; Copyright (C) 2012-2014 Free Software Foundation, Inc.
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; Contributed by Red Hat.
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;
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; This file is free software; you can redistribute it and/or modify it
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; under the terms of the GNU General Public License as published by the
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; Free Software Foundation; either version 3, or (at your option) any
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; later version.
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;
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; This file is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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; General Public License for more details.
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;
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; Under Section 7 of GPL version 3, you are granted additional
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; permissions described in the GCC Runtime Library Exception, version
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; 3.1, as published by the Free Software Foundation.
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;
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; You should have received a copy of the GNU General Public License and
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; a copy of the GCC Runtime Library Exception along with this program;
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; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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; <http://www.gnu.org/licenses/>.
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#ifdef __MSP430X_LARGE__
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#define ret_ RETA
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#else
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#define ret_ RET
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#endif
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.text
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;; int __cmpsi2 (signed long A, signed long B)
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;;
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;; Performs a signed comparison of A and B.
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;; If A is less than B it returns 0. If A is greater
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;; than B it returns 2. If they are equal it returns 1.
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;; Note - this code is also used by the __ucmpsi2 routine below.
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.global __cmpsi2
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.type __cmpsi2, @function
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__cmpsi2:
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;; A is in r12 (low), r13 (high)
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;; B is in r14 (low), r15 (high)
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;; Result put in r12
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cmp.w r13, r15
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jeq .L_compare_low
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jge .L_less_than
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.L_greater_than:
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mov.w #2, r12
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ret_
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.L_less_than:
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mov.w #0, r12
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ret_
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.L_compare_low:
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cmp.w r12, r14
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jl .L_greater_than
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jne .L_less_than
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mov.w #1, r12
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ret_
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.size __cmpsi2, . - __cmpsi2
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;; int __ucmpsi2 (unsigned long A, unsigned long B)
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;;
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;; Performs an unsigned comparison of A and B.
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;; If A is less than B it returns 0. If A is greater
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;; than B it returns 2. If they are equal it returns 1.
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;;; Note - this function branches into the __cmpsi2 code above.
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.global __ucmpsi2
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.type __ucmpsi2, @function
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__ucmpsi2:
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;; A is in r12 (low), r13 (high)
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;; B is in r14 (low), r15 (high)
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;; Result put in r12
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tst r13
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jn .L_top_bit_set_in_A
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tst r15
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;;; If the top bit of B is set, but A's is clear we know that A < B.
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jn .L_less_than
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;;; Neither A nor B has their top bit set so we can use the __cmpsi2 routine.
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;;; Note we use Jc rather than BR as that saves two bytes. The TST insn always
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;;; sets the C bit.
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jc __cmpsi2
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.L_top_bit_set_in_A:
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tst r15
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;;; If both A and B have their top bit set we can use the __cmpsi2 routine.
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jn __cmpsi2
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;;; Otherwise A has its top bit set and B does not so A > B.
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jc .L_greater_than
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.size __ucmpsi2, . - __ucmpsi2
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