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55 lines
1.7 KiB
ArmAsm
55 lines
1.7 KiB
ArmAsm
/* SPARC v9 __mpn_sub_n -- Subtract two limb vectors of the same length > 0
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and store difference in a third limb vector.
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Copyright (C) 1995-2018 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not,
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see <http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* INPUT PARAMETERS
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res_ptr %o0
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s1_ptr %o1
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s2_ptr %o2
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size %o3 */
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ENTRY(__mpn_sub_n)
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sub %g0,%o3,%g5
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sllx %o3,3,%g1
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add %o1,%g1,%o1 ! make s1_ptr point at end
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add %o2,%g1,%o2 ! make s2_ptr point at end
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add %o0,%g1,%o0 ! make res_ptr point at end
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mov 0,%o4 ! clear carry variable
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sllx %g5,3,%o5 ! compute initial address index
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1: ldx [%o2+%o5],%g1 ! load s2 limb
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add %g5,1,%g5 ! increment loop count
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ldx [%o1+%o5],%o3 ! load s1 limb
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addcc %g1,%o4,%g1 ! add s2 limb and carry variable
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movcc %xcc,0,%o4 ! if carry-out, o4 was 1; clear it
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subcc %o3,%g1,%g1 ! subtract s1 limb from sum
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stx %g1,[%o0+%o5] ! store result
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add %o5,8,%o5 ! increment address index
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brnz,pt %g5,1b
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movcs %xcc,1,%o4 ! if s1 subtract gave carry, record it
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retl
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mov %o4,%o0
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END(__mpn_sub_n)
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