| 1 | /* s_frexpf.c -- float version of s_frexp.c. |
|---|
| 2 | */ |
|---|
| 3 | |
|---|
| 4 | /* |
|---|
| 5 | * ==================================================== |
|---|
| 6 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
|---|
| 7 | * |
|---|
| 8 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
|---|
| 9 | * Permission to use, copy, modify, and distribute this |
|---|
| 10 | * software is freely granted, provided that this notice |
|---|
| 11 | * is preserved. |
|---|
| 12 | * ==================================================== |
|---|
| 13 | */ |
|---|
| 14 | |
|---|
| 15 | #if defined(LIBM_SCCS) && !defined(lint) |
|---|
| 16 | static char rcsid[] = "$NetBSD: s_frexpf.c,v 1.5 1995/05/10 20:47:26 jtc Exp $" ; |
|---|
| 17 | #endif |
|---|
| 18 | |
|---|
| 19 | #include <math.h> |
|---|
| 20 | #include <math_private.h> |
|---|
| 21 | #include <libm-alias-float.h> |
|---|
| 22 | |
|---|
| 23 | static const float |
|---|
| 24 | two25 = 3.3554432000e+07; /* 0x4c000000 */ |
|---|
| 25 | |
|---|
| 26 | float __frexpf(float x, int *eptr) |
|---|
| 27 | { |
|---|
| 28 | int32_t hx,ix; |
|---|
| 29 | GET_FLOAT_WORD(hx,x); |
|---|
| 30 | ix = 0x7fffffff&hx; |
|---|
| 31 | *eptr = 0; |
|---|
| 32 | if(ix>=0x7f800000||(ix==0)) return x + x; /* 0,inf,nan */ |
|---|
| 33 | if (ix<0x00800000) { /* subnormal */ |
|---|
| 34 | x *= two25; |
|---|
| 35 | GET_FLOAT_WORD(hx,x); |
|---|
| 36 | ix = hx&0x7fffffff; |
|---|
| 37 | *eptr = -25; |
|---|
| 38 | } |
|---|
| 39 | *eptr += (ix>>23)-126; |
|---|
| 40 | hx = (hx&0x807fffff)|0x3f000000; |
|---|
| 41 | SET_FLOAT_WORD(x,hx); |
|---|
| 42 | return x; |
|---|
| 43 | } |
|---|
| 44 | libm_alias_float (__frexp, frexp) |
|---|
| 45 | |
|---|
