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

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1 740 jeremybenn
/* s_frexpl.c -- long double version of s_frexp.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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/*
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 * for non-zero x
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 *      x = frexpq(arg,&exp);
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 * return a __float128 fp quantity x such that 0.5 <= |x| <1.0
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 * and the corresponding binary exponent "exp". That is
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 *      arg = x*2^exp.
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 * If arg is inf, 0.0, or NaN, then frexpq(arg,&exp) returns arg
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 * with *exp=0.
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 */
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#include "quadmath-imp.h"
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static const __float128
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two114 = 2.0769187434139310514121985316880384E+34Q; /* 0x4071000000000000, 0 */
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__float128
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frexpq (__float128 x, int *eptr)
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{
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  uint64_t hx, lx, ix;
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  GET_FLT128_WORDS64(hx,lx,x);
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  ix = 0x7fffffffffffffffULL&hx;
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  *eptr = 0;
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  if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x;  /* 0,inf,nan */
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  if (ix<0x0001000000000000ULL) {               /* subnormal */
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    x *= two114;
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    GET_FLT128_MSW64(hx,x);
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    ix = hx&0x7fffffffffffffffULL;
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    *eptr = -114;
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  }
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  *eptr += (ix>>48)-16382;
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  hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL;
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  SET_FLT128_MSW64(x,hx);
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  return x;
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}

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