35 lines
731 B
C
35 lines
731 B
C
/*
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(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Header$ */
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/*
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#define PRT_EXT
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SUBTRACT EXTENDED FORMAT
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*/
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/* assumes that e1 >= e2 on entry */
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/* no test is made to check this */
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/* so make sure yourself */
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#include "FP_types.h"
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sub_ext(e1,e2)
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EXTEND *e1,*e2;
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{
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#ifdef PRT_EXT
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prt_ext("before SUB_EXT() e1:",e1);
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prt_ext("before SUB_EXT() e2:",e2);
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#endif PRT_EXT
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if (e2->m2 > e1->m2)
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e1->m1 -= 1; /* carry in */
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e1->m1 -= e2->m1;
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e1->m2 -= e2->m2;
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#ifdef PRT_EXT
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prt_ext("after SUB_EXT() e1:",e1);
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#endif PRT_EXT
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nrm_ext(e1);
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#ifdef PRT_EXT
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prt_ext("after NRM_EXT() e1:",e1);
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#endif PRT_EXT
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}
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