kc3-lang/SDL/src/libm/s_floor.c

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• Hash : 24c86b55
  Author :
  Date : 2014-09-11T19:24:42
  

  [X11] Reconcile logical keyboard state with physical state on FocusIn since the window system doesn't do it for us like other platforms. This prevents sticky keys and missed keys when going in and out of focus, for example Alt would appear to stick if switching away from an SDL app with Alt-Tab and had to be pressed again. CR: Sam

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• src/libm/s_floor.c

• /* @(#)s_floor.c 5.1 93/09/24 */
  /*
   * ====================================================
   * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   *
   * Developed at SunPro, a Sun Microsystems, Inc. business.
   * Permission to use, copy, modify, and distribute this
   * software is freely granted, provided that this notice
   * is preserved.
   * ====================================================
   */
  
  #if defined(LIBM_SCCS) && !defined(lint)
  static const char rcsid[] =
      "$NetBSD: s_floor.c,v 1.8 1995/05/10 20:47:20 jtc Exp $";
  #endif
  
  /*
   * floor(x)
   * Return x rounded toward -inf to integral value
   * Method:
   *	Bit twiddling.
   * Exception:
   *	Inexact flag raised if x not equal to floor(x).
   */
  
  #include "math_libm.h"
  #include "math_private.h"
  
  #ifdef __STDC__
  static const double huge_val = 1.0e300;
  #else
  static double huge_val = 1.0e300;
  #endif
  
  libm_hidden_proto(floor)
  #ifdef __STDC__
       double floor(double x)
  #else
       double floor(x)
       double x;
  #endif
  {
      int32_t i0, i1, j0;
      u_int32_t i, j;
      EXTRACT_WORDS(i0, i1, x);
      j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
      if (j0 < 20) {
          if (j0 < 0) {           /* raise inexact if x != 0 */
              if (huge_val + x > 0.0) {       /* return 0*sign(x) if |x|<1 */
                  if (i0 >= 0) {
                      i0 = i1 = 0;
                  } else if (((i0 & 0x7fffffff) | i1) != 0) {
                      i0 = 0xbff00000;
                      i1 = 0;
                  }
              }
          } else {
              i = (0x000fffff) >> j0;
              if (((i0 & i) | i1) == 0)
                  return x;       /* x is integral */
              if (huge_val + x > 0.0) {       /* raise inexact flag */
                  if (i0 < 0)
                      i0 += (0x00100000) >> j0;
                  i0 &= (~i);
                  i1 = 0;
              }
          }
      } else if (j0 > 51) {
          if (j0 == 0x400)
              return x + x;       /* inf or NaN */
          else
              return x;           /* x is integral */
      } else {
          i = ((u_int32_t) (0xffffffff)) >> (j0 - 20);
          if ((i1 & i) == 0)
              return x;           /* x is integral */
          if (huge_val + x > 0.0) {   /* raise inexact flag */
              if (i0 < 0) {
                  if (j0 == 20)
                      i0 += 1;
                  else {
                      j = i1 + (1 << (52 - j0));
                      if (j < (u_int32_t) i1)
                          i0 += 1;        /* got a carry */
                      i1 = j;
                  }
              }
              i1 &= (~i);
          }
      }
      INSERT_WORDS(x, i0, i1);
      return x;
  }
  
  libm_hidden_def(floor)
  

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