134 lines
3.1 KiB
NASM
134 lines
3.1 KiB
NASM
; Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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;
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; This file is part of the GNU MP Library.
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;
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; The GNU MP Library is free software; you can redistribute it and/or
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; modify it under the terms of the GNU Lesser General Public License as
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; published by the Free Software Foundation; either version 2.1 of the
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; License, or (at your option) any later version.
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;
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; The GNU MP Library is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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; Lesser General Public License for more details.
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;
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; You should have received a copy of the GNU Lesser General Public
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; License along with the GNU MP Library; see the file COPYING.LIB. If
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; not, write to the Free Software Foundation, Inc., 59 Temple Place -
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; Suite 330, Boston, MA 02111-1307, USA.
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;
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; Adapted by Brian Gladman AMD64 using the Microsoft VC++ v8 64-bit
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; compiler and the YASM assembler.
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; AMD64 mpn_rshift -- mpn right shift
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;
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; Calling interface:
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;
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; mp_limb_t mpn_rshift(
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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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; unsigned shift r9
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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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%define s_len r8
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%define r_tmp r9
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%define d_ptr r10
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%define s_ptr r11
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bits 64
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section .text
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global __gmpn_rshift
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%ifdef DLL
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export __gmpn_rshift
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%endif
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%if 1
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__gmpn_rshift:
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movsxd s_len,r8d
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or s_len,s_len
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jz .0
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mov d_ptr,rcx
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mov s_ptr,rdx
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mov rcx,r9
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cmp s_len,byte 2
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jge .1
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mov rax,[s_ptr]
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mov r_tmp,rax
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shr r_tmp,cl
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neg cl
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mov [d_ptr],r_tmp
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shl rax,cl
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.0: ret
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.1: lea s_ptr,[s_ptr+s_len*8]
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lea d_ptr,[d_ptr+s_len*8]
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neg s_len
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mov rdx,[s_ptr+s_len*8]
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movq xmm0, rdx
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shr rdx,cl
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neg cl
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inc s_len
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.2: mov rax,[s_ptr+s_len*8]
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mov r_tmp,rax
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shl r_tmp,cl
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neg cl
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xor r_tmp,rdx
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shr rax,cl
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neg cl
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mov rdx,rax
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mov [d_ptr+s_len*8-8],r_tmp
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inc s_len
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jnz .2
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mov [d_ptr-8],rax
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movq rax, xmm0
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shl rax,cl
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ret
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%else
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__gmpn_rshift:
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movq mm7, [rdx]
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movd mm1, r9d
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mov eax, 64
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sub eax, r9d
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movd mm0, eax
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movq mm3, mm7
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psllq mm7, mm0
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movq rax, mm7
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lea rdx, [rdx+r8*8]
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lea rcx, [rcx+r8*8]
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neg r8
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add r8, 2
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jg .1
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align 8
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.0: movq mm6, [rdx+r8*8-8]
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movq mm2, mm6
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psllq mm6, mm0
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psrlq mm3, mm1
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por mm3, mm6
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movq [rcx+r8*8-16], mm3
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je .2
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movq mm7, [rdx+r8*8]
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movq mm3, mm7
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psllq mm7, mm0
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psrlq mm2, mm1
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por mm2, mm7
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movq [rcx+r8*8-8], mm2
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add r8, 2
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jle .0
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.1: movq mm2, mm3
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.2: psrlq mm2, mm1
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movq [rcx-8], mm2
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emms
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ret
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%endif
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end
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