44 lines
1.5 KiB
ArmAsm
44 lines
1.5 KiB
ArmAsm
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# I960 __gmpn_sub_n -- Subtract two limb vectors of the same length > 0 and
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# store difference in a third limb vector.
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# Copyright 1995, 2000 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, write to
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# the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301, USA.
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.text
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.align 4
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.globl ___gmpn_sub_n
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___gmpn_sub_n:
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mov 1,g6 # set carry-save register
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cmpo 1,0 # clear cy
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Loop: subo 1,g3,g3 # update loop counter
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ld (g1),g5 # load from s1_ptr
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addo 4,g1,g1 # s1_ptr++
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ld (g2),g4 # load from s2_ptr
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addo 4,g2,g2 # s2_ptr++
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cmpo g6,1 # restore cy from g6, relies on cy being 0
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subc g4,g5,g4 # main subtract
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subc 0,0,g6 # save cy in g6
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st g4,(g0) # store result to res_ptr
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addo 4,g0,g0 # res_ptr++
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cmpobne 0,g3,Loop # when branch is taken, cy will be 0
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mov g6,g0
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ret
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