test-div.c (1271B)
1 #include <assert.h> 2 #include <limits.h> 3 4 struct TestS { 5 long x, y, q, r; 6 }; 7 8 static struct TestS test_s[] = { 9 { 4, 2, 2, 0 }, /* normal cases */ 10 { 9, 7, 1, 2 }, 11 { 0, 0, -1, 0 }, /* div by zero cases */ 12 { 9, 0, -1, 9 }, 13 { LONG_MIN, -1, LONG_MIN, 0 }, /* overflow case */ 14 }; 15 16 struct TestU { 17 unsigned long x, y, q, r; 18 }; 19 20 static struct TestU test_u[] = { 21 { 4, 2, 2, 0 }, /* normal cases */ 22 { 9, 7, 1, 2 }, 23 { 0, 0, ULONG_MAX, 0 }, /* div by zero cases */ 24 { 9, 0, ULONG_MAX, 9 }, 25 }; 26 27 #define ARRAY_SIZE(X) (sizeof(X) / sizeof(*(X))) 28 29 int main (void) 30 { 31 int i; 32 33 for (i = 0; i < ARRAY_SIZE(test_s); i++) { 34 long q, r; 35 36 asm("div %0, %2, %3\n\t" 37 "rem %1, %2, %3" 38 : "=&r" (q), "=r" (r) 39 : "r" (test_s[i].x), "r" (test_s[i].y)); 40 41 assert(q == test_s[i].q); 42 assert(r == test_s[i].r); 43 } 44 45 for (i = 0; i < ARRAY_SIZE(test_u); i++) { 46 unsigned long q, r; 47 48 asm("divu %0, %2, %3\n\t" 49 "remu %1, %2, %3" 50 : "=&r" (q), "=r" (r) 51 : "r" (test_u[i].x), "r" (test_u[i].y)); 52 53 assert(q == test_u[i].q); 54 assert(r == test_u[i].r); 55 } 56 57 return 0; 58 }