complex.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#include <common.h>
#include <irq_func.h>
/*
* CPU test
* Complex calculations
*
* The calculations in this test are just a combination of simpler
* calculations, but probably under different timing conditions, etc.
*/
#include <post.h>
#include "cpu_asm.h"
#if CONFIG_POST & CONFIG_SYS_POST_CPU
extern int cpu_post_complex_1_asm (int a1, int a2, int a3, int a4, int n);
extern int cpu_post_complex_2_asm (int x, int n);
/*
* n
* SUM (a1 * a2 - a3) / a4 = n * result
* i=1
*/
static int cpu_post_test_complex_1 (void)
{
int a1 = 666;
int a2 = 667;
int a3 = 668;
int a4 = 66;
int n = 100;
int result = 6720; /* (a1 * a2 - a3) / a4 */
if (cpu_post_complex_1_asm(a1, a2, a3, a4, n) != n * result)
{
return -1;
}
return 0;
}
/* (1 + x + x^2 + ... + x^n) * (1 - x) = 1 - x^(n+1)
*/
static int cpu_post_test_complex_2 (void)
{
int ret = -1;
int x;
int n;
int k;
int left;
int right;
for (x = -8; x <= 8; x ++)
{
n = 9;
left = cpu_post_complex_2_asm(x, n);
left *= 1 - x;
right = 1;
for (k = 0; k <= n; k ++)
{
right *= x;
}
right = 1 - right;
if (left != right)
{
goto Done;
}
}
ret = 0;
Done:
return ret;
}
int cpu_post_test_complex (void)
{
int ret = 0;
int flag = disable_interrupts();
if (ret == 0)
{
ret = cpu_post_test_complex_1();
}
if (ret == 0)
{
ret = cpu_post_test_complex_2();
}
if (ret != 0)
{
post_log ("Error at complex test !\n");
}
if (flag)
enable_interrupts();
return ret;
}
#endif