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/* Semi-random testing of 32-bit integer operations */
#include <stdio.h>
typedef unsigned int u32;
typedef signed int s32;
typedef unsigned long long u64;
static u32 rnd32(void)
{
static u32 seed = 0;
seed = seed * 69069 + 25173;
return seed;
}
static inline u32 safe_udiv32(u32 x, u32 y)
{
if (y == 0) return 0; else return x / y;
}
static inline u32 safe_umod32(u32 x, u32 y)
{
if (y == 0) return 0; else return x % y;
}
static inline s32 safe_sdiv32(s32 x, s32 y)
{
if (y == 0 || (y == -1 && x == (-1 << 31))) return 0; else return x / y;
}
static inline s32 safe_smod32(s32 x, s32 y)
{
if (y == 0 || (y == -1 && x == (-1 << 31))) return 0; else return x % y;
}
static void test1(u32 x, u32 y)
{
int i;
double f;
printf("x = %x\n", x);
printf("y = %x\n", y);
printf("-x = %x\n", -x);
printf("x + y = %x\n", x + y);
printf("x - y = %x\n", x - y);
printf("x * y = %x\n", x * y);
printf("x /u y = %x\n", safe_udiv32(x, y));
printf("x %%u y = %x\n", safe_umod32(x, y));
printf("x /s y = %x\n", safe_sdiv32(x, y));
printf("x %%s y = %x\n", safe_smod32(x, y));
printf("x /u 3 = %x\n", x / 3);
printf("x %%u 3 = %x\n", x % 3);
printf("x /s 3 = %x\n", (s32)x / 3);
printf("x %%s 3 = %x\n", (s32)x % 3);
printf("x /u 5 = %x\n", x / 5);
printf("x %%u 5 = %x\n", x % 5);
printf("x /s 5 = %x\n", (s32)x / 5);
printf("x %%s 5 = %x\n", (s32)x % 5);
printf("x /u 11 = %x\n", x / 11);
printf("x %%u 11 = %x\n", x % 11);
printf("x /s 11 = %x\n", (s32)x / 11);
printf("x %%s 11 = %x\n", (s32)x % 11);
printf("~x = %x\n", ~x);
printf("x & y = %x\n", x & y);
printf("x | y = %x\n", x | y);
printf("x ^ y = %x\n", x ^ y);
i = y & 31;
printf("x << i = %x\n", x << i);
printf("x >>u i = %x\n", x >> i);
printf("x >>s i = %x\n", (s32) x >> i);
printf("x cmpu y = %s\n",
x == y ? "eq" : x < y ? "lt" : "gt");
printf("x cmps y = %s\n",
x == y ? "eq" : (s32)x < (s32)y ? "lt" : "gt");
f = (double) x;
printf("utod x = %llx\n", *((u64*) &f));
f = f * 0.0001;
printf("dtou f = %x\n", (u32) f);
f = (double) ((s32) x);
printf("stod x = %llx\n", *((u64*) &f));
f = f * 0.0001;
printf("dtos f = %x\n", (s32) f);
printf("\n");
}
u32 special_values[] = {
0,
1,
-1,
0x7FFFFFFFU,
0x80000000U,
};
#define NUM_SPECIAL_VALUES (sizeof(special_values) / sizeof(u32))
int main()
{
int i, j;
u32 x, y;
for (i = 0; i < NUM_SPECIAL_VALUES; i++) {
for (j = 0; j < NUM_SPECIAL_VALUES; j++) {
test1(special_values[i], special_values[j]);
}
test1(special_values[i], rnd32());
test1(rnd32(), special_values[i]);
}
for (i = 0; i < 100; i++) {
x = rnd32(); y = rnd32();
test1(x, y);
}
return 0;
}
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