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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [modfq.c] - Blame information for rev 740

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1 740 jeremybenn
/* s_modfl.c -- long double version of s_modf.c.
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 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
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 */
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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 SunPro, 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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#include "quadmath-imp.h"
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static const __float128 one = 1.0;
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__float128
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modfq (__float128 x, __float128 *iptr)
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{
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        int64_t i0,i1,j0;
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        uint64_t i;
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        GET_FLT128_WORDS64(i0,i1,x);
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        j0 = ((i0>>48)&0x7fff)-0x3fff;  /* exponent of x */
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        if(j0<48) {                     /* integer part in high x */
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            if(j0<0) {                   /* |x|<1 */
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                /* *iptr = +-0 */
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                SET_FLT128_WORDS64(*iptr,i0&0x8000000000000000ULL,0);
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                return x;
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            } else {
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                i = (0x0000ffffffffffffLL)>>j0;
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                if(((i0&i)|i1)==0) {             /* x is integral */
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                    *iptr = x;
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                    /* return +-0 */
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                    SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
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                    return x;
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                } else {
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                    SET_FLT128_WORDS64(*iptr,i0&(~i),0);
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                    return x - *iptr;
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                }
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            }
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        } else if (j0>111) {            /* no fraction part */
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            *iptr = x*one;
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            /* We must handle NaNs separately.  */
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            if (j0 == 0x4000 && ((i0 & 0x0000ffffffffffffLL) | i1))
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              return x*one;
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            /* return +-0 */
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            SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
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            return x;
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        } else {                        /* fraction part in low x */
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            i = -1ULL>>(j0-48);
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            if((i1&i)==0) {              /* x is integral */
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                *iptr = x;
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                /* return +-0 */
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                SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
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                return x;
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            } else {
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                SET_FLT128_WORDS64(*iptr,i0,i1&(~i));
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                return x - *iptr;
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            }
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        }
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}

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