diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/ldbl-96/s_frexpl.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/ldbl-96/s_frexpl.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/ldbl-96/s_frexpl.c b/REORG.TODO/sysdeps/ieee754/ldbl-96/s_frexpl.c new file mode 100644 index 0000000000..799880f373 --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/ldbl-96/s_frexpl.c @@ -0,0 +1,61 @@ +/* s_frexpl.c -- long double version of s_frexp.c. + * Conversion to long double by Ulrich Drepper, + * Cygnus Support, drepper@cygnus.com. + */ + +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: $"; +#endif + +/* + * for non-zero x + * x = frexpl(arg,&exp); + * return a long double fp quantity x such that 0.5 <= |x| <1.0 + * and the corresponding binary exponent "exp". That is + * arg = x*2^exp. + * If arg is inf, 0.0, or NaN, then frexpl(arg,&exp) returns arg + * with *exp=0. + */ + +#include <float.h> +#include <math.h> +#include <math_private.h> + +static const long double +#if LDBL_MANT_DIG == 64 +two65 = 3.68934881474191032320e+19L; /* 0x4040, 0x80000000, 0x00000000 */ +#else +# error "Cannot handle this MANT_DIG" +#endif + + +long double __frexpl(long double x, int *eptr) +{ + u_int32_t se, hx, ix, lx; + GET_LDOUBLE_WORDS(se,hx,lx,x); + ix = 0x7fff&se; + *eptr = 0; + if(ix==0x7fff||((ix|hx|lx)==0)) return x + x; /* 0,inf,nan */ + if (ix==0x0000) { /* subnormal */ + x *= two65; + GET_LDOUBLE_EXP(se,x); + ix = se&0x7fff; + *eptr = -65; + } + *eptr += ix-16382; + se = (se & 0x8000) | 0x3ffe; + SET_LDOUBLE_EXP(x,se); + return x; +} +weak_alias (__frexpl, frexpl) |