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/* Copyright (C) 1994 W. Schelter
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This file is part of GNU Common Lisp, herein referred to as GCL
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GCL is free software; you can redistribute it and/or modify it under
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the terms of the GNU LIBRARY GENERAL PUBLIC LICENSE as published by
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the Free Software Foundation; either version 2, or (at your option)
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GCL is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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You should have received a copy of the GNU library general public
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license along with GCL; see the file COPYING. If not, write to the
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Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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(h = hiremainder, y = addmul(a,b), hiremainder:y == a*b + h) is true
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ulong xlo,xhi,ylo,yhi;
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xlo=x&65535;xhi=x>>16;ylo=y&65535;yhi=y>>16;
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z=addll(xlo*yhi,xhi*ylo);
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z2=(overflow)?xhi*yhi+65536+(z>>16):xhi*yhi+(z>>16);
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z=addll(xlo*ylo,(z<<16));z2+=overflow;
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z=addll(z,hiremainder);hiremainder=z2+overflow;