diff options
Diffstat (limited to 'newlib/libm/math/sf_frexp.c')
| -rw-r--r-- | newlib/libm/math/sf_frexp.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/newlib/libm/math/sf_frexp.c b/newlib/libm/math/sf_frexp.c new file mode 100644 index 00000000000..271fb9dca68 --- /dev/null +++ b/newlib/libm/math/sf_frexp.c @@ -0,0 +1,61 @@ +/* sf_frexp.c -- float version of s_frexp.c. + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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. + * ==================================================== + */ + +#include "fdlibm.h" + +#ifdef __STDC__ +static const float +#else +static float +#endif +two25 = 3.3554432000e+07; /* 0x4c000000 */ + +#ifdef __STDC__ + float frexpf(float x, int *eptr) +#else + float frexpf(x, eptr) + float x; int *eptr; +#endif +{ + __int32_t hx, ix; + GET_FLOAT_WORD(hx,x); + ix = 0x7fffffff&hx; + *eptr = 0; + if(ix>=0x7f800000||(ix==0)) return x; /* 0,inf,nan */ + if (ix<0x00800000) { /* subnormal */ + x *= two25; + GET_FLOAT_WORD(hx,x); + ix = hx&0x7fffffff; + *eptr = -25; + } + *eptr += (ix>>23)-126; + hx = (hx&0x807fffff)|0x3f000000; + SET_FLOAT_WORD(x,hx); + return x; +} + +#ifdef _DOUBLE_IS_32BITS + +#ifdef __STDC__ + double frexp(double x, int *eptr) +#else + double frexp(x, eptr) + double x; int *eptr; +#endif +{ + return (double) frexpf((float) x, eptr); +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ |