gcc/testsuite/gcc.dg/20030626-1.c

   1 /* PR optimization/11210 */
   2 /* Originator: Guido Classen <guido@clagi.de> */
   3 /* Reduced testcase by Falk Hueffner <falk@debian.org> */
   4 /* { dg-do compile } */
   5 /* { dg-options "-O" } */
   6
   7 /* Verify that the constant expressions folder doesn't
   8    throw away the cast operation in the comparison.  */
   9
  10 struct str {
  11   int head;
  12   signed char data[8];
  13 };
  14
  15 int foo(struct str t)
  16 {
  17   return t.data[0] || (unsigned char) t.data[2] != 130; /* { dg-bogus "comparison is always 1" } */
  18 }