1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2
3 #include <stdint.h>
4 #include <stdlib.h>
5 #include <stdio.h>
6
mac_w(int64_t mac,const int16_t * a,const int16_t * b)7 int64_t mac_w(int64_t mac, const int16_t *a, const int16_t *b)
8 {
9 register uint32_t macl __asm__("macl") = mac;
10 register uint32_t mach __asm__("mach") = mac >> 32;
11
12 asm volatile("mac.w @%0+,@%1+"
13 : "+r"(a), "+r"(b), "+x"(macl), "+x"(mach));
14
15 return ((uint64_t)mach << 32) | macl;
16 }
17
18 typedef struct {
19 int64_t mac;
20 int16_t a, b;
21 int64_t res[2];
22 } Test;
23
24 __attribute__((noinline))
test(const Test * t,int sat)25 void test(const Test *t, int sat)
26 {
27 int64_t res;
28
29 if (sat) {
30 asm volatile("sets");
31 } else {
32 asm volatile("clrs");
33 }
34 res = mac_w(t->mac, &t->a, &t->b);
35
36 if (res != t->res[sat]) {
37 fprintf(stderr, "%#llx + (%#x * %#x) = %#llx -- got %#llx\n",
38 t->mac, t->a, t->b, t->res[sat], res);
39 abort();
40 }
41 }
42
main()43 int main()
44 {
45 static const Test tests[] = {
46 { 0, 2, 3, { 6, 6 } },
47 { 0x123456787ffffffell, 2, -3,
48 { 0x123456787ffffff8ll, 0x123456787ffffff8ll } },
49 { 0xabcdef127ffffffall, 2, 3,
50 { 0xabcdef1280000000ll, 0x000000017fffffffll } },
51 { 0xfffffffffll, INT16_MAX, INT16_MAX,
52 { 0x103fff0000ll, 0xf3fff0000ll } },
53 };
54
55 for (int i = 0; i < sizeof(tests) / sizeof(tests[0]); ++i) {
56 for (int j = 0; j < 2; ++j) {
57 test(&tests[i], j);
58 }
59 }
60 return 0;
61 }
62