20040409-1.c

来自「Mac OS X 10.4.9 for x86 Source Code gcc」· C语言 代码 · 共 143 行

#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;
}

int test2(int x)
{
  return x + INT_MIN;
}

unsigned int test2u(unsigned int x)
{
  return x + (unsigned int)INT_MIN;
}

int test3(int x)
{
  return x - 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;
}

int test5(int x)
{
  int y = INT_MIN;
  return x + y;
}

unsigned int test5u(unsigned int x)
{
  unsigned int y = (unsigned int)INT_MIN;
  return x + y;
}

int test6(int x)
{
  int y = 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 (test2(a) != b)
    abort();
  if (test3(a) != b)
    abort();
  if (test4(a) != b)
    abort();
  if (test5(a) != b)
    abort();
  if (test6(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(0x00000000,0x80000000);
  test(0x80000000,0x00000000);
  test(0x12345678,0x92345678);
  test(0x92345678,0x12345678);
  test(0x7fffffff,0xffffffff);
  test(0xffffffff,0x7fffffff);

  testu(0x00000000,0x80000000);
  testu(0x80000000,0x00000000);
  testu(0x12345678,0x92345678);
  testu(0x92345678,0x12345678);
  testu(0x7fffffff,0xffffffff);
  testu(0xffffffff,0x7fffffff);
#endif

#if INT_MAX == 32767
  test(0x0000,0x8000);
  test(0x8000,0x0000);
  test(0x1234,0x9234);
  test(0x9234,0x1234);
  test(0x7fff,0xffff);
  test(0xffff,0x7fff);

  testu(0x0000,0x8000);
  testu(0x8000,0x0000);
  testu(0x1234,0x9234);
  testu(0x9234,0x1234);
  testu(0x7fff,0xffff);
  testu(0xffff,0x7fff);
#endif

  return 0;
}