The Android Open Source Project | b07e1d9 | 2009-03-03 19:29:30 -0800 | [diff] [blame] | 1 | |
| 2 | /* @(#)e_scalb.c 1.3 95/01/18 */ |
| 3 | /* |
| 4 | * ==================================================== |
| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| 6 | * |
| 7 | * Developed at SunSoft, a Sun Microsystems, Inc. business. |
| 8 | * Permission to use, copy, modify, and distribute this |
| 9 | * software is freely granted, provided that this notice |
| 10 | * is preserved. |
| 11 | * ==================================================== |
| 12 | */ |
| 13 | |
| 14 | /* |
| 15 | * __ieee754_scalb(x, fn) is provide for |
| 16 | * passing various standard test suite. One |
| 17 | * should use ieee_scalbn() instead. |
| 18 | */ |
| 19 | |
| 20 | #include "fdlibm.h" |
| 21 | |
| 22 | #ifdef _SCALB_INT |
| 23 | #ifdef __STDC__ |
| 24 | double __ieee754_scalb(double x, int fn) |
| 25 | #else |
| 26 | double __ieee754_scalb(x,fn) |
| 27 | double x; int fn; |
| 28 | #endif |
| 29 | #else |
| 30 | #ifdef __STDC__ |
| 31 | double __ieee754_scalb(double x, double fn) |
| 32 | #else |
| 33 | double __ieee754_scalb(x,fn) |
| 34 | double x, fn; |
| 35 | #endif |
| 36 | #endif |
| 37 | { |
| 38 | #ifdef _SCALB_INT |
| 39 | return ieee_scalbn(x,fn); |
| 40 | #else |
| 41 | if (ieee_isnan(x)||ieee_isnan(fn)) return x*fn; |
| 42 | if (!ieee_finite(fn)) { |
| 43 | if(fn>0.0) return x*fn; |
| 44 | else return x/(-fn); |
| 45 | } |
| 46 | if (ieee_rint(fn)!=fn) return (fn-fn)/(fn-fn); |
| 47 | if ( fn > 65000.0) return ieee_scalbn(x, 65000); |
| 48 | if (-fn > 65000.0) return ieee_scalbn(x,-65000); |
| 49 | return ieee_scalbn(x,(int)fn); |
| 50 | #endif |
| 51 | } |