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