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97 lines
2.6 KiB
C++
97 lines
2.6 KiB
C++
// Copyright 2007 Altera Corporation. All rights reserved.
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// Altera products are protected under numerous U.S. and foreign patents,
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// maskwork rights, copyrights and other intellectual property laws.
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//
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// This reference design file, and your use thereof, is subject to and governed
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// by the terms and conditions of the applicable Altera Reference Design
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// License Agreement (either as signed by you or found at www.altera.com). By
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// using this reference design file, you indicate your acceptance of such terms
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// and conditions between you and Altera Corporation. In the event that you do
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// not agree with such terms and conditions, you may not use the reference
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// design file and please promptly destroy any copies you have made.
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//
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// This reference design file is being provided on an "as-is" basis and as an
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// accommodation and therefore all warranties, representations or guarantees of
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// any kind (whether express, implied or statutory) including, without
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// limitation, warranties of merchantability, non-infringement, or fitness for
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// a particular purpose, are specifically disclaimed. By making this reference
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// design file available, Altera expressly does not recommend, suggest or
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// require that this reference design file be used in combination with any
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// other product not provided by Altera.
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/////////////////////////////////////////////////////////////////////////////
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#include <stdio.h>
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#include <math.h>
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#include <stdlib.h>
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int main (void)
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{
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float f = 0.0;
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void * ptr = &f;
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unsigned int i = 0;
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float tmp_x,tmp_y,sq,orig;
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int n = 0;
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int max = 100000;
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srand (123);
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for (n=0; n<max; n++)
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{
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// select random float val
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tmp_x = rand();
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tmp_y = rand();
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if (tmp_y == 0.0) tmp_y = 1;
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f = tmp_x / tmp_y;
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i = *((unsigned int *)ptr);
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fprintf (stdout,"32'h%08x,",i);
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// inverse square root
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orig = f;
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sq = 1/sqrt(orig);
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// Error less than 2 %
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tmp_x = sq * 0.98;
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tmp_y = sq * 1.02;
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f = tmp_x;
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i = *((unsigned int *)ptr);
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fprintf (stdout,"32'h%08x,",i);
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f = tmp_y;
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i = *((unsigned int *)ptr);
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fprintf (stdout,"32'h%08x, ",i);
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// Error less than 5 %
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tmp_x = sq * 0.95;
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tmp_y = sq * 1.05;
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f = tmp_x;
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i = *((unsigned int *)ptr);
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fprintf (stdout,"32'h%08x,",i);
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f = tmp_y;
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i = *((unsigned int *)ptr);
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fprintf (stdout,"32'h%08x, ",i);
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// Error less than 10 %
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tmp_x = sq * 0.90;
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tmp_y = sq * 1.10;
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f = tmp_x;
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i = *((unsigned int *)ptr);
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fprintf (stdout,"32'h%08x,",i);
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f = tmp_y;
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i = *((unsigned int *)ptr);
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fprintf (stdout,"32'h%08x",i);
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if (n != (max-1)) fprintf (stdout,",");
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fprintf (stdout,"// invsqrt(%0.4f) = %0.4f\n",orig,sq);
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}
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return (0);
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}
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