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Annotation of cci/usr/src/usr.lib/libF77/c_sqrt.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  *     "@(#)c_sqrtf.c  1.1"
                      3:  */
                      4: 
                      5: #include "complex"
                      6: 
                      7: /* THIS IS BASED ON TAHOE FLOATING POINT REPR. */
                      8: #include <FP.h>
                      9: 
                     10: c_sqrt(r, z)
                     11: register complex *r, *z;
                     12: {
                     13: float mag, cabs();
                     14: fortran float sqrt();
                     15: 
                     16: if( (mag = cabs(z->real, z->imag)) == 0.)
                     17:        r->real = r->imag = 0.;
                     18: else if(z->real > 0)
                     19:        {
                     20:        r->real = sqrt(0.5 * (mag + z->real) );
                     21:        r->imag = z->imag / r->real / 2;
                     22:        }
                     23: else
                     24:        {
                     25:        r->imag = sqrt(0.5 * (mag - z->real) );
                     26:        if(z->imag < 0)
                     27:                *(unsigned long*)&(r->imag) ^= SIGN_BIT;
                     28:        r->real = z->imag / r->imag /2;
                     29:        }
                     30: }

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