131 lines
2.9 KiB
NASM
131 lines
2.9 KiB
NASM
; PROLOGUE(mpn_rshift2)
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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 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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; mp_limb_t mpn_rshift2(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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%define reg_save_list rsi, rdi
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CPU Athlon64
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BITS 64
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FRAME_PROC mpn_rshift2, 0, reg_save_list
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lea rsi, [rdx+24]
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lea rdi, [rcx+24]
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mov rcx, r8
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xor eax, eax
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xor edx, edx
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sub rcx, 4
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jc .2
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xalign 16
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.1: mov r8, [rsi+rcx*8]
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mov r9, [rsi+rcx*8-8]
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mov r10, [rsi+rcx*8-16]
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mov r11, [rsi+rcx*8-24]
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add rax, rax
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rcr r8, 1
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rcr r9, 1
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rcr r10, 1
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rcr r11, 1
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sbb rax, rax
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add rdx, rdx
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rcr r8, 1
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rcr r9, 1
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rcr r10, 1
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rcr r11, 1
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mov [rdi+rcx*8-24], r11
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sbb rdx, rdx
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mov [rdi+rcx*8], r8
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sub rcx, 4
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mov [rdi+rcx*8+24], r9
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mov [rdi+rcx*8+16], r10
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jnc .1
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.2: cmp rcx, -2
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ja .4
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je .5
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jp .6
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.3: lea rax, [rax+rdx*2]
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neg rax
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shl rax, 62
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EXIT_PROC reg_save_list
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xalign 16
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.4: mov r8, [rsi+rcx*8]
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mov r9, [rsi+rcx*8-8]
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mov r10, [rsi+rcx*8-16]
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add rax, rax
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rcr r8, 1
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rcr r9, 1
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rcr r10, 1
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sbb rax, rax
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add rdx, rdx
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rcr r8, 1
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rcr r9, 1
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rcr r10, 1
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sbb rdx, rdx
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mov [rdi+rcx*8], r8
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mov [rdi+rcx*8-8], r9
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mov [rdi+rcx*8-16], r10
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lea rax, [rax+rdx*2]
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neg rax
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shl rax, 62
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EXIT_PROC reg_save_list
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xalign 16
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.5: mov r8, [rsi+rcx*8]
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mov r9, [rsi+rcx*8-8]
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add rax, rax
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rcr r8, 1
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rcr r9, 1
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sbb rax, rax
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add rdx, rdx
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rcr r8, 1
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rcr r9, 1
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sbb rdx, rdx
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mov [rdi+rcx*8], r8
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mov [rdi+rcx*8-8], r9
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lea rax, [rax+rdx*2]
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neg rax
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shl rax, 62
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EXIT_PROC reg_save_list
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xalign 16
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.6: mov r8, [rsi+rcx*8]
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add rax, rax
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rcr r8, 1
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sbb rax, rax
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add rdx, rdx
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rcr r8, 1
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sbb rdx, rdx
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mov [rdi+rcx*8], r8
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lea rax, [rax+rdx*2]
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neg rax
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shl rax, 62
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.7: END_PROC reg_save_list
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end
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