115 lines
2.6 KiB
NASM
115 lines
2.6 KiB
NASM
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; AMD64 mpn_sub_n
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; Copyright 2008 Jason Moxham
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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 = borrow
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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 r10
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%define LIMB2 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 r9
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%define LIMB2 r10
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%endif
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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 rax, Size
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and rax, 3
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shr Size, 2
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cmp Size, 0
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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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mov LIMB1, [Inp1P]
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sbb LIMB1, [Inp2P]
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mov [SumP], LIMB1
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dec rax
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jz end1
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mov LIMB1, [Inp1P+8]
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sbb LIMB1, [Inp2P+8]
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mov [SumP+8], LIMB1
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dec rax
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jz end1
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mov LIMB1, [Inp1P+16]
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sbb LIMB1, [Inp2P+16]
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mov [SumP+16], LIMB1
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dec rax
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end1:
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adc rax, rax
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ret
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align 8
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loop1:
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mov LIMB2, [Inp1P]
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mov LIMB1, [Inp1P+8]
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sbb LIMB2, [Inp2P]
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lea Inp1P, [Inp1P+32]
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sbb LIMB1, [Inp2P+8]
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lea Inp2P, [Inp2P+32]
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mov [SumP+8], LIMB1
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mov [SumP], LIMB2
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mov LIMB1, [Inp1P-16]
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mov LIMB2, [Inp1P-8]
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sbb LIMB1, [Inp2P-16]
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lea SumP, [SumP+32]
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sbb LIMB2, [Inp2P-8]
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mov [SumP-8], LIMB2
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mov [SumP-16], LIMB1
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dec Size
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jnz loop1
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inc rax
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dec rax
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jz end
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mov LIMB1, [Inp1P]
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sbb LIMB1, [Inp2P]
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mov [SumP], LIMB1
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dec rax
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jz end
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mov LIMB1, [Inp1P+8]
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sbb LIMB1, [Inp2P+8]
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mov [SumP+8], LIMB1
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dec rax
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jz end
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mov LIMB1, [Inp1P+16]
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sbb LIMB1, [Inp2P+16]
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mov [SumP+16], LIMB1
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dec rax
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end:
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adc rax, rax
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ret
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