| s_tanf.c (152647) | s_tanf.c (152713) |
|---|---|
| 1/* s_tanf.c -- float version of s_tan.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3 */ 4 5/* 6 * ==================================================== 7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8 * 9 * Developed at SunPro, a Sun Microsystems, Inc. business. 10 * Permission to use, copy, modify, and distribute this 11 * software is freely granted, provided that this notice 12 * is preserved. 13 * ==================================================== 14 */ 15 16#ifndef lint | 1/* s_tanf.c -- float version of s_tan.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3 */ 4 5/* 6 * ==================================================== 7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8 * 9 * Developed at SunPro, a Sun Microsystems, Inc. business. 10 * Permission to use, copy, modify, and distribute this 11 * software is freely granted, provided that this notice 12 * is preserved. 13 * ==================================================== 14 */ 15 16#ifndef lint |
| 17static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_tanf.c 152647 2005-11-21 04:57:12Z bde $"; | 17static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_tanf.c 152713 2005-11-23 14:27:56Z bde $"; |
| 18#endif 19 20#include "math.h" 21#define INLINE_KERNEL_TANF 22#include "math_private.h" 23#include "k_tanf.c" 24 25/* Small multiples of pi/2 rounded to double precision. */ 26static const double 27t1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */ 28t2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */ 29t3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */ 30t4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */ 31 | 18#endif 19 20#include "math.h" 21#define INLINE_KERNEL_TANF 22#include "math_private.h" 23#include "k_tanf.c" 24 25/* Small multiples of pi/2 rounded to double precision. */ 26static const double 27t1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */ 28t2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */ 29t3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */ 30t4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */ 31 |
| 32static inline float 33__kernel_tandf(double x, int iy) 34{ 35 return __kernel_tanf((float)x, x - (float)x, iy); 36} 37 | |
| 38float 39tanf(float x) 40{ 41 float y[2]; 42 int32_t n, hx, ix; 43 44 GET_FLOAT_WORD(hx,x); 45 ix = hx & 0x7fffffff; 46 47 if(ix <= 0x3f490fda) { /* |x| ~<= pi/4 */ 48 if(ix<0x39800000) /* |x| < 2**-12 */ 49 if(((int)x)==0) return x; /* x with inexact if x != 0 */ | 32float 33tanf(float x) 34{ 35 float y[2]; 36 int32_t n, hx, ix; 37 38 GET_FLOAT_WORD(hx,x); 39 ix = hx & 0x7fffffff; 40 41 if(ix <= 0x3f490fda) { /* |x| ~<= pi/4 */ 42 if(ix<0x39800000) /* |x| < 2**-12 */ 43 if(((int)x)==0) return x; /* x with inexact if x != 0 */ |
| 50 return __kernel_tanf(x,0.0,1); | 44 return __kernel_tandf(x,1); |
| 51 } 52 if(ix<=0x407b53d1) { /* |x| ~<= 5*pi/4 */ 53 if(ix<=0x4016cbe3) /* |x| ~<= 3pi/4 */ 54 return __kernel_tandf(x + (hx>0 ? -t1pio2 : t1pio2), -1); 55 else 56 return __kernel_tandf(x + (hx>0 ? -t2pio2 : t2pio2), 1); 57 } 58 if(ix<=0x40e231d5) { /* |x| ~<= 9*pi/4 */ --- 5 unchanged lines hidden (view full) --- 64 65 /* tan(Inf or NaN) is NaN */ 66 else if (ix>=0x7f800000) return x-x; 67 68 /* general argument reduction needed */ 69 else { 70 n = __ieee754_rem_pio2f(x,y); 71 /* integer parameter: 1 -- n even; -1 -- n odd */ | 45 } 46 if(ix<=0x407b53d1) { /* |x| ~<= 5*pi/4 */ 47 if(ix<=0x4016cbe3) /* |x| ~<= 3pi/4 */ 48 return __kernel_tandf(x + (hx>0 ? -t1pio2 : t1pio2), -1); 49 else 50 return __kernel_tandf(x + (hx>0 ? -t2pio2 : t2pio2), 1); 51 } 52 if(ix<=0x40e231d5) { /* |x| ~<= 9*pi/4 */ --- 5 unchanged lines hidden (view full) --- 58 59 /* tan(Inf or NaN) is NaN */ 60 else if (ix>=0x7f800000) return x-x; 61 62 /* general argument reduction needed */ 63 else { 64 n = __ieee754_rem_pio2f(x,y); 65 /* integer parameter: 1 -- n even; -1 -- n odd */ |
| 72 return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); | 66 return __kernel_tandf((double)y[0]+y[1],1-((n&1)<<1)); |
| 73 } 74} | 67 } 68} |