modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/compile/pr50380.c (about)

     1  __attribute__ ((__noreturn__)) extern void fail (void);
     2  
     3  char x;
     4  
     5  /* This used to get stuck in an infinite loop in find_comparison_args
     6     when compiling this function for MIPS at -O2.  */
     7  
     8  void foo (const unsigned char y)
     9  {
    10     ((void) (__builtin_expect((!! y == y), 1) ? 0 : (fail (), 0)));
    11     x = ! y;
    12  }
    13  
    14  /* This used to similarly get stuck when compiling for PowerPC at -O2.  */
    15  
    16  int foo2 (int arg)
    17  {
    18    if (arg != !arg)
    19      fail ();
    20    if (arg)
    21      fail ();
    22  }