URL
https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [common/] [s_logb.c] - Rev 193
Go to most recent revision | Compare with Previous | Blame | View Log
/* @(#)s_logb.c 5.1 93/09/24 */ /* * ==================================================== * 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. * ==================================================== */ /* * double logb(x) * IEEE 754 logb. Included to pass IEEE test suite. Not recommend. * Use ilogb instead. */ #include "fdlibm.h" #ifndef _DOUBLE_IS_32BITS #ifdef __STDC__ double logb(double x) #else double logb(x) double x; #endif { __int32_t lx,ix; EXTRACT_WORDS(ix,lx,x); ix &= 0x7fffffff; /* high |x| */ if((ix|lx)==0) return -1.0/fabs(x); if(ix>=0x7ff00000) return x*x; if((ix>>=20)==0) /* IEEE 754 logb */ return -1022.0; else return (double) (ix-1023); } #endif /* _DOUBLE_IS_32BITS */
Go to most recent revision | Compare with Previous | Blame | View Log