1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 3 #include <stdint.h> 4 #include <stdlib.h> 5 #include <stdio.h> 6 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)) 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 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