74 lines
1.9 KiB
NASM
74 lines
1.9 KiB
NASM
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; PROLOGUE(mpn_divexact_byff)
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; Copyright 2009 Jason Moxham
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;
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; Windows Conversion Copyright 2008 Brian Gladman
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;
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; This file is part of the MPIR Library.
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;
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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 verdxon 2.1 of the License, or (at
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; your option) any later verdxon.
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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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;
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; mp_limb_t mpn_divexact_byff(mp_ptr, mp_ptr, mp_size_t)
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; rax rdi rsi rdx
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; rax rcx rdx r8
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%include "yasm_mac.inc"
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CPU Athlon64
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BITS 64
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LEAF_PROC mpn_divexact_byff
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mov rax, 3
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and rax, r8
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mov [rsp+24], rax
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xor eax, eax
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shr r8, 2
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cmp r8, 0
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je .2
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; want carry clear here
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xalign 16
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.1: sbb rax, [rdx]
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lea rcx, [rcx+32]
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mov r9, rax
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sbb rax, [rdx+8]
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mov r10, rax
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sbb rax, [rdx+16]
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mov r11, rax
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sbb rax, [rdx+24]
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dec r8
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mov [rcx-32], r9
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mov [rcx-24], r10
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mov [rcx-16], r11
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mov [rcx-8], rax
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lea rdx, [rdx+32]
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jnz .1
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.2: mov r8, [rsp+24]
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; dont want to change the carry
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inc r8
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dec r8
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jz .3
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sbb rax, [rdx]
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mov [rcx], rax
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dec r8
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jz .3
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sbb rax, [rdx+8]
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mov [rcx+8], rax
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dec r8
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jz .3
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sbb rax, [rdx+16]
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mov [rcx+16], rax
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.3: sbb rax, 0
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ret
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end
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