94 lines
2.2 KiB
NASM
94 lines
2.2 KiB
NASM
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; AMD64 mpn_divexact_byff
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;
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; Copyright 2008 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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; 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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;
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; Calling interface:
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;
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; mp_limb_t mpn_divexact_byff(
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; mp_ptr dst, rcx
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; mp_srcptr src, rdx
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; mp_size_t size, r8
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; )
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;
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; This is an SEH leaf function (no unwind support needed)
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bits 64
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section .text
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global __gmpn_divexact_byff
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%ifdef DLL
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export __gmpn_divexact_byff
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%endif
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__gmpn_divexact_byff:
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mov r8d, 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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jnz .2 ; carry flag is clear here
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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: sbb rax, 0
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ret
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align 16
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.2: 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: sbb rax, 0
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ret
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end
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