Subversion Repositories DashDisplay

Rev

Rev 2 | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 2 Rev 5
Line 1... Line 1...
1 
/* ----------------------------------------------------------------------    
 1 
/* ----------------------------------------------------------------------    
2 
* Copyright (C) 2010-2014 ARM Limited. All rights reserved.  
 2 
* Copyright (C) 2010-2014 ARM Limited. All rights reserved.  
3 
*    
 3 
*    
4 
* $Date:        19. March 2015
 4 
* $Date:        19. October 2015
5 
* $Revision:    V.1.4.5
 5 
* $Revision:    V.1.4.5 a
6 
*    
 6 
*    
7 
* Project:      CMSIS DSP Library  
 7 
* Project:      CMSIS DSP Library  
8 
* Title:                arm_sqrt_q31.c    
 8 
* Title:                arm_sqrt_q31.c    
9 
*    
 9 
*    
10 
* Description:  Q31 square root function.    
 10 
* Description:  Q31 square root function.    
Line 96... Line 96...
96 
    temp_float1 = number * 4.6566128731e-010f;
 96 
    temp_float1 = number * 4.6566128731e-010f;
97 
    /*Store as integer */
 97 
    /*Store as integer */
98 
    tempconv.floatval = temp_float1;
 98 
    tempconv.floatval = temp_float1;
99 
    bits_val1 = tempconv.fracval;
 99 
    bits_val1 = tempconv.fracval;
100 
    /* Subtract the shifted value from the magic number to give intial guess */
 100 
    /* Subtract the shifted value from the magic number to give intial guess */
101 
    bits_val1 = 0x5f3759df - (bits_val1 >> 1);  // gives initial guess  
 101 
    bits_val1 = 0x5f3759df - (bits_val1 >> 1);  /* gives initial guess */
102 
    /* Store as float */
 102 
    /* Store as float */
103 
    tempconv.fracval = bits_val1;
 103 
    tempconv.fracval = bits_val1;
104 
    temp_float1 = tempconv.floatval;
 104 
    temp_float1 = tempconv.floatval;
105 
    /* Convert to integer format */
 105 
    /* Convert to integer format */
106 
    var1 = (q31_t) (temp_float1 * 1073741824);
 106 
    var1 = (q31_t) (temp_float1 * 1073741824);