| s_logb.c (174698) | s_logb.c (176101) |
|---|---|
| 1/* @(#)s_logb.c 5.1 93/09/24 */ 2/* 3 * ==================================================== 4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 5 * 6 * Developed at SunPro, a Sun Microsystems, Inc. business. 7 * Permission to use, copy, modify, and distribute this 8 * software is freely granted, provided that this notice 9 * is preserved. 10 * ==================================================== 11 */ 12 | 1/* @(#)s_logb.c 5.1 93/09/24 */ 2/* 3 * ==================================================== 4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 5 * 6 * Developed at SunPro, a Sun Microsystems, Inc. business. 7 * Permission to use, copy, modify, and distribute this 8 * software is freely granted, provided that this notice 9 * is preserved. 10 * ==================================================== 11 */ 12 |
| 13#ifndef lint 14static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_logb.c 174698 2007-12-17 03:53:38Z das $"; 15#endif | 13#include <sys/cdefs.h> 14__FBSDID("$FreeBSD: head/lib/msun/src/s_logb.c 176101 2008-02-08 01:22:13Z bde $"); |
| 16 17/* 18 * double logb(x) 19 * IEEE 754 logb. Included to pass IEEE test suite. Not recommend. 20 * Use ilogb instead. 21 */ 22 23#include <float.h> --- 9 unchanged lines hidden (view full) --- 33{ 34 int32_t lx,ix; 35 EXTRACT_WORDS(ix,lx,x); 36 ix &= 0x7fffffff; /* high |x| */ 37 if((ix|lx)==0) return -1.0/fabs(x); 38 if(ix>=0x7ff00000) return x*x; 39 if(ix<0x00100000) { 40 x *= two54; /* convert subnormal x to normal */ | 15 16/* 17 * double logb(x) 18 * IEEE 754 logb. Included to pass IEEE test suite. Not recommend. 19 * Use ilogb instead. 20 */ 21 22#include <float.h> --- 9 unchanged lines hidden (view full) --- 32{ 33 int32_t lx,ix; 34 EXTRACT_WORDS(ix,lx,x); 35 ix &= 0x7fffffff; /* high |x| */ 36 if((ix|lx)==0) return -1.0/fabs(x); 37 if(ix>=0x7ff00000) return x*x; 38 if(ix<0x00100000) { 39 x *= two54; /* convert subnormal x to normal */ |
| 41 GET_FLOAT_WORD(ix,x); | 40 GET_HIGH_WORD(ix,x); |
| 42 ix &= 0x7fffffff; | 41 ix &= 0x7fffffff; |
| 43 return (float) ((ix>>20)-1023-54); | 42 return (double) ((ix>>20)-1023-54); |
| 44 } else 45 return (double) ((ix>>20)-1023); 46} 47 48#if (LDBL_MANT_DIG == 53) 49__weak_reference(logb, logbl); 50#endif | 43 } else 44 return (double) ((ix>>20)-1023); 45} 46 47#if (LDBL_MANT_DIG == 53) 48__weak_reference(logb, logbl); 49#endif |