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Annotation of coherent/d/lib/libm/tanh.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Hyperbolic tangent.
                      3:  */
                      4: #include <math.h>
                      5: 
                      6: #if    EMU87
                      7: #include "emumath.h"
                      8: #endif
                      9: 
                     10: double
                     11: tanh(x)
                     12: double x;
                     13: {
                     14:        double r;
                     15:        register int s;
                     16: 
                     17:        s = 0;
                     18:        if (x < 0.0) {
                     19:                x = -x;
                     20:                s = 1;
                     21:        }
                     22:        r = exp(-2.0*x);
                     23:        r = (1.0-r) / (1.0+r);
                     24:        return (s?-r:r);
                     25: }

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