tan.c File Reference

#include "libm.h"

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Functions
double	tan (double x)

Function Documentation

tan()

double tan

(

double

x

)

Definition at line 58 of file tan.c.

{
    double y[2];
    uint32_t ix;
    unsigned n;
 
    GET_HIGH_WORD(ix, x);
    ix &= 0x7fffffff;
 
    /* |x| ~< pi/4 */
    if (ix <= 0x3fe921fb) {
        if (ix < 0x3e400000) { /* |x| < 2**-27 */
            /* raise inexact if x!=0 and underflow if subnormal */
            FORCE_EVAL(ix < 0x00100000 ? x/0x1p120f : x+0x1p120f);
            return x;
        }
        return __tan(x, 0.0, 0);
    }
 
    /* tan(Inf or NaN) is NaN */
    if (ix >= 0x7ff00000)
        return x - x;
 
    /* argument reduction */
    n = __rem_pio2(x, y);
    return __tan(y[0], y[1], n&1);
}

Referenced by __libm_sse2_tan(), __libm_sse2_tanf(), _CItan(), _libm_sse2_tan_precise(), app_boundary_point(), D2D1MakeSkewMatrix(), GdipCreateLineBrushFromRectWithAngle(), Global_Tan(), init_layer3(), Math_tan(), rpn_tan(), SkewDIB(), tanf(), tanl(), Test_tan_approx(), Test_tan_exact(), and ValarrayTest::transcendentals().