genfloat.c

powerpc 405 优化过的硬浮点库

/* fpopt/genfloat.c, pl_FPE_common, pl_linux 12/12/03 16:18:27
 *----------------------------------------------------------------------------   
 *
 *  Copyright (C) 2003 IBM Corporation 
 *  All rights reserved.               
 *                                     
 *  Redistribution and use in source and binary forms, with or      
 *  without modification, are permitted provided that the following 
 *  conditions are met:                                             
 *                                                                  
 *    * Redistributions of source code must retain the above        
 *      copyright notice, this list of conditions and the following 
 *      disclaimer.                                                 
 *    * Redistributions in binary form must reproduce the above     
 *      copyright notice, this list of conditions and the following 
 *      disclaimer in the documentation and/or other materials      
 *      provided with the distribution.                             
 *    * Neither the name of IBM nor the names of its contributors   
 *      may be used to endorse or promote products derived from this
 *      software without specific prior written permission.         
 *                                                                  
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND          
 *  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,     
 *  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF        
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE        
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS   
 *  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 
 *  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,            
 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR  
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 
 *  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT        
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE   
 *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *                                                                              */
/*----------------------------------------------------------------------------- */
/* Function:                                                                    */
/*     This module doesn't perform any useful function.  Its purpose is simply  */
/*     to generate invocations to the various floating point functions to test  */
/*     that the libraries successfuly link with an executable, and to provide   */
/*     a simple access point for unit test of the various functions.            */
/*----------------------------------------------------------------------------- */

/*----------------------------------------------------------------------------+
| Main.
+----------------------------------------------------------------------------*/
int main()
{
   typedef struct {
      char name1[100];
      char name2[100];
   } name_s;
   
   name_s firstnames = {"SAM", "JOE" };
   name_s lastnames = firstnames; 

   double dx=1000;
   double dy=3000;
   double dz, dq;
   
   float x=100;
   float y=300;
   float z, q;
   float zero=0;
   
   int sint;
   unsigned int uint;

   /* double precision arithmetic operations */
   dz = dx+dy;
   dq = dx-dy;
   dz = dx/dy;
   dz = dy*dy;
   dq = dz/dy;

   /* single precision arithmetic operations */
   z = x+y;
   q = x-y;
   z = y*y;
   q = z/y;
   q = q/zero;

   /* conversion functions */
   x = dx;          /* convert double to single */
   dx = x;          /* and back again */
   sint = dx;       /* double to signed integer */
   sint = x;        /* single to signed integer */
   uint = dx;       /* double to unsigned integer */
   uint = x;        /* single to unsigned integer */
   dx = sint;       /* signed integer to double */
   x = sint;        /* signed integer to single */
   dx = uint;       /* unsigned integer to double */
   x = uint;        /* unsigned integer to single */

   /* double compares */
   if (dx == dy) 
     z = q;
   if (dx < dy)
     z = q;
   if (dx > dy)
     q = z;
   if (dx >= dy)
     q = z;

   /* single compares */
   if (x == y) 
     z = q;
   if (x < y)
     z = q;
   if (x > y)
     q = z;
   if (x >= y)
     q = z; 
   
   /* mixed compares */
   if (dx == y) 
     z = q;
   if (x < dy)
     z = q;
   if (dx > y)
     q = z;
   if (x >= dy)
     q = z; 

   return(0);
}