2012-11-25 17:13:44 -05:00
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; PROLOGUE(rshift)
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; Verdxon 1.0.3.
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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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;
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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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;
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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_rshift(mp_ptr, mp_ptr, mp_size_t, mp_uint)
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; rax rdi rsi rdx rcx
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; rax rcx rdx r8 r9d
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%include "yasm_mac.inc"
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%define reg_save_list rbx, rsi, rdi
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CPU Athlon64
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BITS 64
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FRAME_PROC mpn_rshift, 0, reg_save_list
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; when n=1 mod4 seem to have different runtimes
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mov rax, r8
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mov rbx, 4
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lea rsi, [rdx+rax*8-24]
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lea rdi, [rcx+rax*8-24]
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mov rcx, r9
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sub rbx, rax
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xor rax, rax
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mov rdx, [rsi+rbx*8-8]
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shrd rax, rdx, cl
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cmp rbx, 0
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jge .2
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xalign 16
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.1: mov r8, [rsi+rbx*8]
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mov r11, [rsi+rbx*8+24]
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shrd rdx, r8, cl
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mov r9, [rsi+rbx*8+8]
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shrd r8, r9, cl
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mov [rdi+rbx*8-8], rdx
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mov [rdi+rbx*8], r8
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mov r10, [rsi+rbx*8+16]
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shrd r9, r10, cl
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mov rdx, r11
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mov [rdi+rbx*8+8], r9
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shrd r10, r11, cl
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add rbx, 4
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mov [rdi+rbx*8-16], r10
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jnc .1
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.2: cmp rbx, 2
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ja .6
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je .5
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jp .4
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.3: mov r8, [rsi+rbx*8]
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shrd rdx, r8, cl
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mov r9, [rsi+rbx*8+8]
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shrd r8, r9, cl
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mov [rdi+rbx*8-8], rdx
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mov [rdi+rbx*8], r8
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mov r10, [rsi+rbx*8+16]
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shrd r9, r10, cl
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mov [rdi+rbx*8+8], r9
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shr r10, cl
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mov [rdi+rbx*8+16], r10
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EXIT_PROC reg_save_list
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xalign 16
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.4: mov r8, [rsi+rbx*8]
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shrd rdx, r8, cl
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mov r9, [rsi+rbx*8+8]
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shrd r8, r9, cl
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mov [rdi+rbx*8-8], rdx
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mov [rdi+rbx*8], r8
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shr r9, cl
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mov [rdi+rbx*8+8], r9
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EXIT_PROC reg_save_list
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xalign 16
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.5: mov r8, [rsi+rbx*8]
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shrd rdx, r8, cl
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shr r8, cl
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mov [rdi+rbx*8-8], rdx
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mov [rdi+rbx*8], r8
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EXIT_PROC reg_save_list
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xalign 16
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.6: shr rdx, cl
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mov [rdi+rbx*8-8], rdx
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.7: END_PROC reg_save_list
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end
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