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  1. /*
  2.  * Copyright (C) 2005 Josef Cejka
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include<sftypes.h>
  30. #include<comparison.h>
  31.  
  32. inline int isFloat32NaN(float32 f)
  33. {   /* NaN : exp = 0xff and nonzero mantisa */
  34.     return ((f.parts.exp==0xFF)&&(f.parts.mantisa));
  35. };
  36.  
  37. inline int isFloat32SigNaN(float32 f)
  38. {   /* SigNaN : exp = 0xff mantisa = 1xxxxx..x (binary), where at least one x is nonzero */
  39.     return ((f.parts.exp==0xFF)&&(f.parts.mantisa>0x400000));
  40. };
  41.  
  42. inline int isFloat32Infinity(float32 f)
  43. {
  44.     return ((f.parts.exp==0xFF)&&(f.parts.mantisa==0x0));
  45. };
  46.  
  47. inline int isFloat32Zero(float32 f)
  48. {
  49.     return (((f.binary) & 0x7FFFFFFF) == 0);
  50. }
  51.  
  52. /**
  53.  * @return 1, if both floats are equal - but NaNs are not recognized
  54.  */
  55. inline int isFloat32eq(float32 a, float32 b)
  56. {
  57.     return ((a.binary==b.binary)||(((a.binary| b.binary)&0x7FFFFFFF)==0)); /* a equals to b or both are zeros (with any sign) */
  58. }
  59.  
  60. /**
  61.  * @return 1, if a<b - but NaNs are not recognized
  62.  */
  63. inline int isFloat32lt(float32 a, float32 b)
  64. {
  65.     if (((a.binary| b.binary)&0x7FFFFFFF)==0) {
  66.         return 0; /* +- zeroes */
  67.     };
  68.    
  69.     if ((a.parts.sign)&&(b.parts.sign)) {
  70.         /*if both are negative, smaller is that with greater binary value*/
  71.         return (a.binary>b.binary);
  72.         };
  73.    
  74.     /* lets negate signs - now will be positive numbers allways bigger than negative (first bit will be set for unsigned integer comparison)*/
  75.     a.parts.sign=!a.parts.sign;
  76.     b.parts.sign=!b.parts.sign;
  77.     return (a.binary<b.binary);
  78.            
  79. }
  80.  
  81. /**
  82.  * @return 1, if a>b - but NaNs are not recognized
  83.  */
  84. inline int isFloat32gt(float32 a, float32 b)
  85. {
  86.     if (((a.binary| b.binary)&0x7FFFFFFF)==0) {
  87.         return 0; /* zeroes are equal with any sign */
  88.     };
  89.    
  90.     if ((a.parts.sign)&&(b.parts.sign)) {
  91.         /*if both are negative, greater is that with smaller binary value*/
  92.         return (a.binary<b.binary);
  93.         };
  94.    
  95.     /* lets negate signs - now will be positive numbers allways bigger than negative (first bit will be set for unsigned integer comparison)*/
  96.     a.parts.sign=!a.parts.sign;
  97.     b.parts.sign=!b.parts.sign;
  98.     return (a.binary>b.binary);
  99.            
  100. }
  101.  
  102.  
  103.