LXR uboot/post/lib_powerpc/complex.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2002
   4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5 */
   6
   7#include <common.h>
   8
   9/*
  10 * CPU test
  11 * Complex calculations
  12 *
  13 * The calculations in this test are just a combination of simpler
  14 * calculations, but probably under different timing conditions, etc.
  15 */
  16
  17#include <post.h>
  18#include "cpu_asm.h"
  19
  20#if CONFIG_POST & CONFIG_SYS_POST_CPU
  21
  22extern int cpu_post_complex_1_asm (int a1, int a2, int a3, int a4, int n);
  23extern int cpu_post_complex_2_asm (int x, int n);
  24
  25  /*
  26   *     n
  27   *    SUM (a1 * a2 - a3) / a4 = n * result
  28   *    i=1
  29   */
  30static int cpu_post_test_complex_1 (void)
  31{
  32    int a1 = 666;
  33    int a2 = 667;
  34    int a3 = 668;
  35    int a4 = 66;
  36    int n = 100;
  37    int result = 6720; /* (a1 * a2 - a3) / a4 */
  38
  39    if (cpu_post_complex_1_asm(a1, a2, a3, a4, n) != n * result)
  40    {
  41        return -1;
  42    }
  43
  44    return 0;
  45}
  46
  47  /*    (1 + x + x^2 + ... + x^n) * (1 - x) = 1 - x^(n+1)
  48   */
  49static int cpu_post_test_complex_2 (void)
  50{
  51    int ret = -1;
  52    int x;
  53    int n;
  54    int k;
  55    int left;
  56    int right;
  57
  58    for (x = -8; x <= 8; x ++)
  59    {
  60        n = 9;
  61
  62        left = cpu_post_complex_2_asm(x, n);
  63        left *= 1 - x;
  64
  65        right = 1;
  66        for (k = 0; k <= n; k ++)
  67        {
  68            right *= x;
  69        }
  70        right = 1 - right;
  71
  72        if (left != right)
  73        {
  74            goto Done;
  75        }
  76    }
  77
  78    ret = 0;
  79    Done:
  80
  81    return ret;
  82}
  83
  84int cpu_post_test_complex (void)
  85{
  86    int ret = 0;
  87    int flag = disable_interrupts();
  88
  89    if (ret == 0)
  90    {
  91        ret = cpu_post_test_complex_1();
  92    }
  93
  94    if (ret == 0)
  95    {
  96        ret = cpu_post_test_complex_2();
  97    }
  98
  99    if (ret != 0)
 100    {
 101        post_log ("Error at complex test !\n");
 102    }
 103
 104    if (flag)
 105        enable_interrupts();
 106
 107    return ret;
 108}
 109
 110#endif
 111