77 lines
1.7 KiB
ArmAsm
77 lines
1.7 KiB
ArmAsm
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# Pyramid __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 2
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.globl ___gmpn_sub_n
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___gmpn_sub_n:
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movw $-1,tr0 # representation for carry clear
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movw pr3,tr2
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andw $3,tr2
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beq Lend0
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subw tr2,pr3
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Loop0: rsubw $0,tr0 # restore carry bit from carry-save register
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movw (pr1),tr1
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subwb (pr2),tr1
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movw tr1,(pr0)
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subwb tr0,tr0
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addw $4,pr0
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addw $4,pr1
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addw $4,pr2
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addw $-1,tr2
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bne Loop0
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mtstw pr3,pr3
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beq Lend
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Lend0:
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Loop: rsubw $0,tr0 # restore carry bit from carry-save register
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movw (pr1),tr1
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subwb (pr2),tr1
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movw tr1,(pr0)
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movw 4(pr1),tr1
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subwb 4(pr2),tr1
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movw tr1,4(pr0)
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movw 8(pr1),tr1
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subwb 8(pr2),tr1
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movw tr1,8(pr0)
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movw 12(pr1),tr1
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subwb 12(pr2),tr1
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movw tr1,12(pr0)
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subwb tr0,tr0
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addw $16,pr0
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addw $16,pr1
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addw $16,pr2
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addw $-4,pr3
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bne Loop
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Lend:
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mnegw tr0,pr0
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ret
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