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87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
/* @(#)s_modf.c 1.3 95/01/18 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunSoft, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#define modfl _dummy_modfl
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#include <precomp.h>
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#undef modfl
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//static const double one = 1.0;
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long double modfl(long double __x, long double *__i)
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{
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union
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{
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long double* __x;
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long_double_s* x;
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} x;
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union
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{
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long double* __i;
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long_double_s* iptr;
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} iptr;
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int j0;
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unsigned int i;
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x.__x = &__x;
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iptr.__i = __i;
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j0 = x.x->exponent - 0x3fff; /* exponent of x */
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if(j0<32) { /* integer part in high x */
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if(j0<0) { /* |x|<1 */
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*__i = 0.0L;
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iptr.iptr->sign = x.x->sign;
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return __x;
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} else {
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i = ((unsigned int)(0xffffffff))>>(j0+1);
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if ( x.x->mantissal == 0 && (x.x->mantissal & i) == 0 ) {
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*__i = __x;
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__x = 0.0L;
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x.x->sign = iptr.iptr->sign;
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return __x;
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}
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iptr.iptr->sign = x.x->sign;
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iptr.iptr->exponent = x.x->exponent;
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iptr.iptr->mantissah = x.x->mantissah&((~i));
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iptr.iptr->mantissal = 0;
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return __x - *__i;
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}
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} else if (j0>63) { /* no fraction part */
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*__i = __x;
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if ( _isnanl(__x) || _isinfl(__x) )
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return __x;
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__x = 0.0L;
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x.x->sign = iptr.iptr->sign;
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return __x;
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} else { /* fraction part in low x */
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i = ((unsigned int)(0xffffffff))>>(j0-32);
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if ( x.x->mantissal == 0 ) {
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*__i = __x;
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__x = 0.0L;
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x.x->sign = iptr.iptr->sign;
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return __x;
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}
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iptr.iptr->sign = x.x->sign;
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iptr.iptr->exponent = x.x->exponent;
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iptr.iptr->mantissah = x.x->mantissah;
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iptr.iptr->mantissal = x.x->mantissal&(~i);
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return __x - *__i;
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}
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}
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