1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#define MACL_S_MIN (-(1ll << 47))
#define MACL_S_MAX ((1ll << 47) - 1)
int64_t mac_l(int64_t mac, const int32_t *a, const int32_t *b)
{
register uint32_t macl __asm__("macl") = mac;
register uint32_t mach __asm__("mach") = mac >> 32;
asm volatile("mac.l @%0+,@%1+"
: "+r"(a), "+r"(b), "+x"(macl), "+x"(mach));
return ((uint64_t)mach << 32) | macl;
}
typedef struct {
int64_t mac;
int32_t a, b;
int64_t res[2];
} Test;
__attribute__((noinline))
void test(const Test *t, int sat)
{
int64_t res;
if (sat) {
asm volatile("sets");
} else {
asm volatile("clrs");
}
res = mac_l(t->mac, &t->a, &t->b);
if (res != t->res[sat]) {
fprintf(stderr, "%#llx + (%#x * %#x) = %#llx -- got %#llx\n",
t->mac, t->a, t->b, t->res[sat], res);
abort();
}
}
int main()
{
static const Test tests[] = {
{ 0x00007fff12345678ll, INT32_MAX, INT32_MAX,
{ 0x40007ffe12345679ll, MACL_S_MAX } },
{ MACL_S_MIN, -1, 1,
{ 0xffff7fffffffffffll, MACL_S_MIN } },
{ INT64_MIN, -1, 1,
{ INT64_MAX, MACL_S_MIN } },
{ 0x00007fff00000000ll, INT32_MAX, INT32_MAX,
{ 0x40007ffe00000001ll, MACL_S_MAX } },
{ 4, 1, 2, { 6, 6 } },
{ -4, -1, -2, { -2, -2 } },
};
for (int i = 0; i < sizeof(tests) / sizeof(tests[0]); ++i) {
for (int j = 0; j < 2; ++j) {
test(&tests[i], j);
}
}
return 0;
}
|
