diff options
Diffstat (limited to 'src/MSL_C.PPCEABI.bare.H/s_frexp.c')
-rw-r--r-- | src/MSL_C.PPCEABI.bare.H/s_frexp.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/MSL_C.PPCEABI.bare.H/s_frexp.c b/src/MSL_C.PPCEABI.bare.H/s_frexp.c new file mode 100644 index 0000000..dcc1a26 --- /dev/null +++ b/src/MSL_C.PPCEABI.bare.H/s_frexp.c @@ -0,0 +1,57 @@ +/* @(#)s_frexp.c 1.3 95/01/04 */ +/* + * ==================================================== + * 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. + * ==================================================== + */ + +/* + * for non-zero x + * x = frexp(arg,&exp); + * return a 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 frexp(arg,&exp) returns arg + * with *exp=0. + */ + +#include "fdlibm.h" + +#ifdef __STDC__ +static const double +#else +static double +#endif + two54 = 1.80143985094819840000e+16; /* 0x43500000, 0x00000000 */ + +#ifdef __STDC__ +double frexp(double x, int* eptr) +#else +double frexp(x, eptr) +double x; +int* eptr; +#endif +{ + int hx, ix, lx; + hx = __HI(x); + ix = 0x7fffffff & hx; + lx = __LO(x); + *eptr = 0; + if (ix >= 0x7ff00000 || ((ix | lx) == 0)) + return x; /* 0,inf,nan */ + if (ix < 0x00100000) { /* subnormal */ + x *= two54; + hx = __HI(x); + ix = hx & 0x7fffffff; + *eptr = -54; + } + *eptr += (ix >> 20) - 1022; + hx = (hx & 0x800fffff) | 0x3fe00000; + __HI(x) = hx; + return x; +} |