70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
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/* Copyright 2012 The Code cavern
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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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#include "mpir.h"
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#include "gmp-impl.h"
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#include "longlong.h"
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// t=x+y-z
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int mpn_addsub_n(mp_ptr t,mp_srcptr x,mp_srcptr y,mp_srcptr z,mp_size_t n)
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{mp_limb_t ret;
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if(t==x && t==y && t==z)
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{
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return 0;
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}
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if(t==x && t==y)
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{ret=mpn_add_n(t,x,y,n);
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ret-=mpn_sub_n(t,t,z,n);
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return ret;
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}
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if(t==x && t==z)
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{ret=-mpn_sub_n(t,x,z,n);
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ret+=mpn_add_n(t,t,y,n);
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return ret;
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}
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if(t==y && t==z)
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{ret=-mpn_sub_n(t,y,z,n);
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ret+=mpn_add_n(t,t,x,n);
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return ret;
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}
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if(t==x)
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{ret=mpn_add_n(t,x,y,n);
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ret-=mpn_sub_n(t,t,z,n);
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return ret;
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}
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if(t==y)
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{ret=mpn_add_n(t,y,x,n);
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ret-=mpn_sub_n(t,t,z,n);
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return ret;
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}
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if(t==z)
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{ret=-mpn_sub_n(t,x,z,n);
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ret+=mpn_add_n(t,t,y,n);
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return ret;
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}
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ret=mpn_add_n(t,x,y,n);
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ret-=mpn_sub_n(t,t,z,n);
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return ret;
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}
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