94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
|
/*
|
||
|
|
* Test CDSG instruction.
|
||
|
|
*
|
||
|
|
* Increment the first half of aligned_quadword by 1, and the second half by 2
|
||
|
|
* from 2 threads. Verify that the result is consistent.
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
*/
|
||
|
|
#include <assert.h>
|
||
|
|
#include <pthread.h>
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
static volatile bool start;
|
||
|
|
typedef unsigned long aligned_quadword[2] __attribute__((__aligned__(16)));
|
||
|
|
static aligned_quadword val;
|
||
|
|
static const int n_iterations = 1000000;
|
||
|
|
|
||
|
|
static inline int cdsg(unsigned long *orig0, unsigned long *orig1,
|
||
|
|
unsigned long new0, unsigned long new1,
|
||
|
|
aligned_quadword *mem)
|
||
|
|
{
|
||
|
|
register unsigned long r0 asm("r0");
|
||
|
|
register unsigned long r1 asm("r1");
|
||
|
|
register unsigned long r2 asm("r2");
|
||
|
|
register unsigned long r3 asm("r3");
|
||
|
|
int cc;
|
||
|
|
|
||
|
|
r0 = *orig0;
|
||
|
|
r1 = *orig1;
|
||
|
|
r2 = new0;
|
||
|
|
r3 = new1;
|
||
|
|
asm("cdsg %[r0],%[r2],%[db2]\n"
|
||
|
|
"ipm %[cc]"
|
||
|
|
: [r0] "+r" (r0)
|
||
|
|
, [r1] "+r" (r1)
|
||
|
|
, [db2] "+m" (*mem)
|
||
|
|
, [cc] "=r" (cc)
|
||
|
|
: [r2] "r" (r2)
|
||
|
|
, [r3] "r" (r3)
|
||
|
|
: "cc");
|
||
|
|
*orig0 = r0;
|
||
|
|
*orig1 = r1;
|
||
|
|
|
||
|
|
return (cc >> 28) & 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
void *cdsg_loop(void *arg)
|
||
|
|
{
|
||
|
|
unsigned long orig0, orig1, new0, new1;
|
||
|
|
int cc;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
while (!start) {
|
||
|
|
}
|
||
|
|
|
||
|
|
orig0 = val[0];
|
||
|
|
orig1 = val[1];
|
||
|
|
for (i = 0; i < n_iterations;) {
|
||
|
|
new0 = orig0 + 1;
|
||
|
|
new1 = orig1 + 2;
|
||
|
|
|
||
|
|
cc = cdsg(&orig0, &orig1, new0, new1, &val);
|
||
|
|
|
||
|
|
if (cc == 0) {
|
||
|
|
orig0 = new0;
|
||
|
|
orig1 = new1;
|
||
|
|
i++;
|
||
|
|
} else {
|
||
|
|
assert(cc == 1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
pthread_t thread;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = pthread_create(&thread, NULL, cdsg_loop, NULL);
|
||
|
|
assert(ret == 0);
|
||
|
|
start = true;
|
||
|
|
cdsg_loop(NULL);
|
||
|
|
ret = pthread_join(thread, NULL);
|
||
|
|
assert(ret == 0);
|
||
|
|
|
||
|
|
assert(val[0] == n_iterations * 2);
|
||
|
|
assert(val[1] == n_iterations * 4);
|
||
|
|
|
||
|
|
return EXIT_SUCCESS;
|
||
|
|
}
|