84 lines
2.1 KiB
NASM
84 lines
2.1 KiB
NASM
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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 r8d
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%include "..\yasm_mac.inc"
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CPU Core2
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BITS 64
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LEAF_PROC mpn_divexact_byff
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movsxd r8, r8d
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xor eax, eax
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mov r9, r8
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and r9, 3
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shr r8, 2
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cmp r8, 0
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; carry flag is clear here
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jnz .2
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sbb rax, [rdx]
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mov [rcx], rax
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dec r9
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jz .1
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sbb rax, [rdx+8]
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mov [rcx+8], rax
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dec r9
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jz .1
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sbb rax, [rdx+16]
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mov [rcx+16], rax
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dec r9
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.1:
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sbb rax, 0
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ret
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xalign 16
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.2:
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sbb rax, [rdx]
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mov [rcx], rax
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sbb rax, [rdx+8]
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mov [rcx+8], rax
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sbb rax, [rdx+16]
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mov [rcx+16], rax
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sbb rax, [rdx+24]
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mov [rcx+24], rax
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lea rdx, [rdx+32]
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dec r8
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lea rcx, [rcx+32]
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jnz .2
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inc r9
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dec r9
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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 r9
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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 r9
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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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dec r9
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.3:
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sbb rax, 0
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ret
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