108 lines
2.4 KiB
NASM
108 lines
2.4 KiB
NASM
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; Copyright 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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; Translation of AT&T syntax code by Brian Gladman
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%include "..\..\x86i.inc"
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%define p_space 16
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extern ___gmp_modlimb_invert_table
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section .text
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global ___gmpn_divexact_1
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%ifdef DLL
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export ___gmpn_divexact_1
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%endif
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align 16
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___gmpn_divexact_1:
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mov edx,[12+esp]
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mov eax,[8+esp]
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mov ecx,[16+esp]
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sub edx,1
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jnz two_or_more
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mov eax,[eax]
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xor edx,edx
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div ecx
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mov ecx,[4+esp]
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mov [ecx],eax
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ret
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two_or_more:
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mov eax,ecx
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bsf ecx,ecx
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shr eax,cl
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movd mm6,eax
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movd mm7,ecx
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shr eax,1
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and eax,127
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movzx eax,byte [___gmp_modlimb_invert_table+eax]
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movd mm5,eax
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movd mm0,eax
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pmuludq mm5,mm5
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pmuludq mm5,mm6
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paddd mm0,mm0
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psubd mm0,mm5
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pxor mm5,mm5
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paddd mm5,mm0
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pmuludq mm0,mm0
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pcmpeqd mm4,mm4
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psrlq mm4,32
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pmuludq mm0,mm6
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paddd mm5,mm5
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mov eax,[8+esp]
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mov ecx,[4+esp]
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pxor mm1,mm1
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psubd mm5,mm0
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pxor mm0,mm0
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top:
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movd mm2,[eax]
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movd mm3,[4+eax]
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add eax,4
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punpckldq mm2,mm3
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psrlq mm2,mm7
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pand mm2,mm4
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psubq mm2,mm0
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psubq mm2,mm1
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movq mm0,mm2
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psrlq mm0,63
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pmuludq mm2,mm5
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movd [ecx],mm2
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add ecx,4
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movq mm1,mm6
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pmuludq mm1,mm2
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psrlq mm1,32
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sub edx,1
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jnz top
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done:
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movd mm2,[eax]
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psrlq mm2,mm7
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psubq mm2,mm0
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psubq mm2,mm1
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pmuludq mm2,mm5
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movd [ecx],mm2
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emms
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ret
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end
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