u-boot/post/lib_powerpc/complex.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

110 lines
1.7 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#include <common.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