Viewing file:  20040409-3.c (1.77 KB) -rw-r--r--
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#include <limits.h>
extern void abort ();
int test1(int x)
{
return ~(x ^ INT_MIN);
}
unsigned int test1u(unsigned int x)
{
return ~(x ^ (unsigned int)INT_MIN);
}
unsigned int test2u(unsigned int x)
{
return ~(x + (unsigned int)INT_MIN);
}
unsigned int test3u(unsigned int x)
{
return ~(x - (unsigned int)INT_MIN);
}
int test4(int x)
{
int y = INT_MIN;
return ~(x ^ y);
}
unsigned int test4u(unsigned int x)
{
unsigned int y = (unsigned int)INT_MIN;
return ~(x ^ y);
}
unsigned int test5u(unsigned int x)
{
unsigned int y = (unsigned int)INT_MIN;
return ~(x + y);
}
unsigned int test6u(unsigned int x)
{
unsigned int y = (unsigned int)INT_MIN;
return ~(x - y);
}
void test(int a, int b)
{
if (test1(a) != b)
abort();
if (test4(a) != b)
abort();
}
void testu(unsigned int a, unsigned int b)
{
if (test1u(a) != b)
abort();
if (test2u(a) != b)
abort();
if (test3u(a) != b)
abort();
if (test4u(a) != b)
abort();
if (test5u(a) != b)
abort();
if (test6u(a) != b)
abort();
}
int main()
{
#if INT_MAX == 2147483647
test(0x00000000,0x7fffffff);
test(0x80000000,0xffffffff);
test(0x12345678,0x6dcba987);
test(0x92345678,0xedcba987);
test(0x7fffffff,0x00000000);
test(0xffffffff,0x80000000);
testu(0x00000000,0x7fffffff);
testu(0x80000000,0xffffffff);
testu(0x12345678,0x6dcba987);
testu(0x92345678,0xedcba987);
testu(0x7fffffff,0x00000000);
testu(0xffffffff,0x80000000);
#endif
#if INT_MAX == 32767
test(0x0000,0x7fff);
test(0x8000,0xffff);
test(0x1234,0x6dcb);
test(0x9234,0xedcb);
test(0x7fff,0x0000);
test(0xffff,0x8000);
testu(0x0000,0x7fff);
testu(0x8000,0xffff);
testu(0x1234,0x6dcb);
testu(0x9234,0xedcb);
testu(0x7fff,0x0000);
testu(0xffff,0x8000);
#endif
return 0;
}
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