127 lines
3.0 KiB
NASM
127 lines
3.0 KiB
NASM
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; AMD64 mpn_sub_n
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; Copyright 2008, 2016 Jason Moxham and Alexander Kruppa
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; This file is part of the MPIR Library.
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; The MPIR 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
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; by the Free Software Foundation; either version 2.1 of the License, or (at
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; your option) any later version.
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; The MPIR 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 MPIR Library; see the file COPYING.LIB. If not, write
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; to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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; Boston, MA 02110-1301, USA.
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; (rdi,rcx) = (rsi,rcx)+(rdx,rcx)
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; rax = carry
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%define USE_WIN64
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%include 'yasm_mac.inc'
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%ifdef USE_WIN64
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%define SumP rcx
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%define Inp1P rdx
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%define Inp2P r8
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%define Size r9
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%define LIMB1 rax
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%define LIMB2 r10
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%define SizeRest r11
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%else
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%define SumP rdi
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%define Inp1P rsi
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%define Inp2P rdx
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%define Size rcx
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%define LIMB1 rax
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%define LIMB2 r9
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%define SizeRest r10
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%endif
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%define ADCSBB sbb
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BITS 64
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xalign 8
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LEAF_PROC mpn_sub_nc
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mov r10,[rsp+40]
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jmp entry
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xalign 8
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LEAF_PROC mpn_sub_n
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xor r10, r10
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entry:
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mov SizeRest, Size
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and SizeRest, 7
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shr Size, 3
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lea Size, [r10 + 2*Size]
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sar Size, 1
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jnz .loop1
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jmp .rest
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align 16
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.loop1:
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mov LIMB1, [Inp1P]
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mov LIMB2, [Inp1P+8]
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ADCSBB LIMB1, [Inp2P]
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mov [SumP], LIMB1
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ADCSBB LIMB2, [Inp2P+8]
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mov LIMB1, [Inp1P+16]
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mov [SumP+8], LIMB2
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ADCSBB LIMB1, [Inp2P+16]
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mov LIMB2, [Inp1P+24]
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mov [SumP+16], LIMB1
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mov LIMB1, [Inp1P+32]
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ADCSBB LIMB2, [Inp2P+24]
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mov [SumP+24], LIMB2
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ADCSBB LIMB1, [Inp2P+32]
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mov [SumP+32], LIMB1
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mov LIMB2, [Inp1P+40]
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ADCSBB LIMB2, [Inp2P+40]
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mov [SumP+40], LIMB2
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mov LIMB1, [Inp1P+48]
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mov LIMB2, [Inp1P+56]
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lea Inp1P, [Inp1P+64]
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ADCSBB LIMB1, [Inp2P+48]
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ADCSBB LIMB2, [Inp2P+56]
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lea Inp2P, [Inp2P+64]
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mov [SumP+48], LIMB1
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mov [SumP+56], LIMB2
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lea SumP, [SumP+64]
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dec Size
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jnz .loop1
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inc SizeRest
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dec SizeRest
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jz .end
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.rest:
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mov LIMB1, [Inp1P]
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ADCSBB LIMB1, [Inp2P]
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mov [SumP], LIMB1
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dec SizeRest
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jz .end
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mov LIMB1, [Inp1P+8]
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ADCSBB LIMB1, [Inp2P+8]
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mov [SumP+8], LIMB1
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dec SizeRest
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jz .end
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mov LIMB1, [Inp1P+16]
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ADCSBB LIMB1, [Inp2P+16]
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mov [SumP+16], LIMB1
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dec SizeRest
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jz .end
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mov LIMB1, [Inp1P+24]
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ADCSBB LIMB1, [Inp2P+24]
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mov [SumP+24], LIMB1
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dec SizeRest
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jz .end
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lea Inp1P, [Inp1P+32]
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lea Inp2P, [Inp2P+32]
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lea SumP, [SumP+32]
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jmp .rest
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.end:
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mov eax, 0
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adc eax, eax
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ret
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