diff options
Diffstat (limited to 'libm/float/tanf.c')
| -rw-r--r-- | libm/float/tanf.c | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/libm/float/tanf.c b/libm/float/tanf.c deleted file mode 100644 index 5bbf43075..000000000 --- a/libm/float/tanf.c +++ /dev/null @@ -1,192 +0,0 @@ -/* tanf.c - * - * Circular tangent - * - * - * - * SYNOPSIS: - * - * float x, y, tanf(); - * - * y = tanf( x ); - * - * - * - * DESCRIPTION: - * - * Returns the circular tangent of the radian argument x. - * - * Range reduction is modulo pi/4. A polynomial approximation - * is employed in the basic interval [0, pi/4]. - * - * - * - * ACCURACY: - * - * Relative error: - * arithmetic domain # trials peak rms - * IEEE +-4096 100000 3.3e-7 4.5e-8 - * - * ERROR MESSAGES: - * - * message condition value returned - * tanf total loss x > 2^24 0.0 - * - */ - /* cotf.c - * - * Circular cotangent - * - * - * - * SYNOPSIS: - * - * float x, y, cotf(); - * - * y = cotf( x ); - * - * - * - * DESCRIPTION: - * - * Returns the circular cotangent of the radian argument x. - * A common routine computes either the tangent or cotangent. - * - * - * - * ACCURACY: - * - * Relative error: - * arithmetic domain # trials peak rms - * IEEE +-4096 100000 3.0e-7 4.5e-8 - * - * - * ERROR MESSAGES: - * - * message condition value returned - * cot total loss x > 2^24 0.0 - * cot singularity x = 0 MAXNUMF - * - */ - -/* -Cephes Math Library Release 2.2: June, 1992 -Copyright 1984, 1987, 1989 by Stephen L. Moshier -Direct inquiries to 30 Frost Street, Cambridge, MA 02140 -*/ - -/* Single precision circular tangent - * test interval: [-pi/4, +pi/4] - * trials: 10000 - * peak relative error: 8.7e-8 - * rms relative error: 2.8e-8 - */ -#include <math.h> - -extern float MAXNUMF; - -static float DP1 = 0.78515625; -static float DP2 = 2.4187564849853515625e-4; -static float DP3 = 3.77489497744594108e-8; -float FOPI = 1.27323954473516; /* 4/pi */ -static float lossth = 8192.; -/*static float T24M1 = 16777215.;*/ - - -static float tancotf( float xx, int cotflg ) -{ -float x, y, z, zz; -long j; -int sign; - - -/* make argument positive but save the sign */ -if( xx < 0.0 ) - { - x = -xx; - sign = -1; - } -else - { - x = xx; - sign = 1; - } - -if( x > lossth ) - { - if( cotflg ) - mtherr( "cotf", TLOSS ); - else - mtherr( "tanf", TLOSS ); - return(0.0); - } - -/* compute x mod PIO4 */ -j = FOPI * x; /* integer part of x/(PI/4) */ -y = j; - -/* map zeros and singularities to origin */ -if( j & 1 ) - { - j += 1; - y += 1.0; - } - -z = ((x - y * DP1) - y * DP2) - y * DP3; - -zz = z * z; - -if( x > 1.0e-4 ) - { -/* 1.7e-8 relative error in [-pi/4, +pi/4] */ - y = - ((((( 9.38540185543E-3 * zz - + 3.11992232697E-3) * zz - + 2.44301354525E-2) * zz - + 5.34112807005E-2) * zz - + 1.33387994085E-1) * zz - + 3.33331568548E-1) * zz * z - + z; - } -else - { - y = z; - } - -if( j & 2 ) - { - if( cotflg ) - y = -y; - else - y = -1.0/y; - } -else - { - if( cotflg ) - y = 1.0/y; - } - -if( sign < 0 ) - y = -y; - -return( y ); -} - - -float tanf( float x ) -{ - -return( tancotf(x,0) ); -} - -float cotf( float x ) -{ - -if( x == 0.0 ) - { - mtherr( "cotf", SING ); - return( MAXNUMF ); - } -return( tancotf(x,1) ); -} - |