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  1. /* sf_tan.c -- float version of s_tan.c.
  2.  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
  3.  */
  4.  
  5. /*
  6.  * ====================================================
  7.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  8.  *
  9.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10.  * Permission to use, copy, modify, and distribute this
  11.  * software is freely granted, provided that this notice
  12.  * is preserved.
  13.  * ====================================================
  14.  */
  15.  
  16. #include "fdlibm.h"
  17.  
  18. #ifdef __STDC__
  19.         float tanf(float x)
  20. #else
  21.         float tanf(x)
  22.         float x;
  23. #endif
  24. {
  25.         float y[2],z=0.0;
  26.         __int32_t n,ix;
  27.  
  28.         GET_FLOAT_WORD(ix,x);
  29.  
  30.     /* |x| ~< pi/4 */
  31.         ix &= 0x7fffffff;
  32.         if(ix <= 0x3f490fda) return __kernel_tanf(x,z,1);
  33.  
  34.     /* tan(Inf or NaN) is NaN */
  35.         else if (!FLT_UWORD_IS_FINITE(ix)) return x-x;          /* NaN */
  36.  
  37.     /* argument reduction needed */
  38.         else {
  39.             n = __ieee754_rem_pio2f(x,y);
  40.             return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); /*   1 -- n even
  41.                                                               -1 -- n odd */
  42.         }
  43. }
  44.  
  45. #ifdef _DOUBLE_IS_32BITS
  46.  
  47. #ifdef __STDC__
  48.         double tan(double x)
  49. #else
  50.         double tan(x)
  51.         double x;
  52. #endif
  53. {
  54.         return (double) tanf((float) x);
  55. }
  56.  
  57. #endif /* defined(_DOUBLE_IS_32BITS) */
  58.