diff options
Diffstat (limited to 'lib/msun/src/k_tanf.c')
| -rw-r--r-- | lib/msun/src/k_tanf.c | 37 |
1 files changed, 17 insertions, 20 deletions
diff --git a/lib/msun/src/k_tanf.c b/lib/msun/src/k_tanf.c index cc498d5..77bc7b71 100644 --- a/lib/msun/src/k_tanf.c +++ b/lib/msun/src/k_tanf.c @@ -21,35 +21,32 @@ static char rcsid[] = "$FreeBSD$"; #include "math.h" #include "math_private.h" -static const float -pio4 = 7.8539812565e-01, /* 0x3f490fda */ -pio4lo= 3.7748947079e-08, /* 0x33222168 */ -/* |tan(x)/x - t(x)| < 2**-29.2 (~[-1.73e-09, 1.724e-09]). */ +static const double +pio4 = M_PI_4, +/* |tan(x)/x - t(x)| < 2**-29.1 (~[-1.72e-09, 1.719e-09]). */ T[] = { - 0xaaaaa3.0p-25, /* 0.33333310485 */ - 0x888b06.0p-26, /* 0.13334283238 */ - 0xdc84c8.0p-28, /* 0.053837567568 */ - 0xb9d8f1.0p-29, /* 0.022686453536 */ - 0xcfe632.0p-31, /* 0.0063445800915 */ - 0xeaf97e.0p-31, /* 0.0071708550677 */ + 0x1555545f8b54d0.0p-54, /* 0.333333104424423432022 */ + 0x111160cdc2c9af.0p-55, /* 0.133342838734802765499 */ + 0x1b9097e5693cd0.0p-57, /* 0.0538375346701457369036 */ + 0x173b2333895b6f.0p-58, /* 0.0226865291791357691353 */ + 0x19fcb197e825ab.0p-60, /* 0.00634450313965243938713 */ + 0x1d5f3701b44a27.0p-60, /* 0.00717088210082520490646 */ }; #ifdef INLINE_KERNEL_TANF extern inline #endif float -__kernel_tanf(float x, float y, int iy) +__kernel_tandf(double x, int iy) { - float z,r,v,w,s; + double z,r,v,w,s; int32_t ix,hx; GET_FLOAT_WORD(hx,x); ix = hx&0x7fffffff; if(ix>=0x3f2ca140) { /* |x|>=0.67434 */ - if(hx<0) {x = -x; y = -y;} - z = pio4-x; - w = pio4lo-y; - x = z+w; y = 0.0; + if(hx<0) {x = -x;} + x = pio4-x; } z = x*x; w = z*z; @@ -60,13 +57,13 @@ __kernel_tanf(float x, float y, int iy) r = T[1]+w*(T[3]+w*T[5]); v = z*(T[2]+w*T[4]); s = z*x; - r = y + z*(s*(r+v)+y); + r = z*s*(r+v); r += T[0]*s; w = x+r; if(ix>=0x3f2ca140) { - v = (float)iy; - return (float)(1-((hx>>30)&2))*(v-(float)2.0*(x-(w*w/(w+v)-r))); + v = (double)iy; + return (double)(1-((hx>>30)&2))*(v-2.0*(x-(w*w/(w+v)-r))); } if(iy==1) return w; - else return -1.0/((double)x+r); + else return -1.0/w; } |
