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68 lines
1.6 KiB
ArmAsm
68 lines
1.6 KiB
ArmAsm
! Z8000 __mpn_mul_1 -- Multiply a limb vector with a limb and store
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! the result in a second limb vector.
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! Copyright (C) 1993, 1994, 1995 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 Library General Public License as published by
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! the Free Software Foundation; either version 2 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 Library General Public
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! License for more details.
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! You should have received a copy of the GNU Library 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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! INPUT PARAMETERS
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! res_ptr r7
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! s1_ptr r6
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! size r5
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! s2_limb r4
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unseg
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.text
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even
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global ___mpn_mul_1
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___mpn_mul_1:
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sub r2,r2 ! zero carry limb
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and r4,r4
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jr mi,Lneg
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Lpos: pop r1,@r6
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ld r9,r1
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mult rr8,r4
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and r1,r1 ! shift msb of loaded limb into cy
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jr mi,Lp ! branch if loaded limb's msb is set
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add r8,r4 ! hi_limb += sign_comp2
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Lp: add r9,r2 ! lo_limb += cy_limb
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xor r2,r2
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adc r2,r8
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ld @r7,r9
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inc r7,#2
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dec r5
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jr ne,Lpos
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ret t
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Lneg: pop r1,@r6
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ld r9,r1
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mult rr8,r4
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add r8,r1 ! hi_limb += sign_comp1
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and r1,r1
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jr mi,Ln
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add r8,r4 ! hi_limb += sign_comp2
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Ln: add r9,r2 ! lo_limb += cy_limb
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xor r2,r2
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adc r2,r8
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ld @r7,r9
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inc r7,#2
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dec r5
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jr ne,Lneg
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ret t
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