gcc/testsuite/gcc.dg/20020607-1.c

   1 /* PR middle-end/6950
   2    gcc 3.0.4 mistakenly set lhs.low to 0 at the beginning of the num_eq
   3    expansion; it should use a temporary.
   4 /* { dg-do run } */
   5
   6 typedef struct cpp_num cpp_num;
   7 struct cpp_num
   8 {
   9   long high;
  10   long low;
  11   char overflow;
  12 };
  13
  14 #define num_eq(num1, num2) (num1.low == num2.low && num1.high == num2.high)
  15
  16 static cpp_num
  17 num_equality_op (lhs, rhs)
  18      cpp_num lhs, rhs;
  19 {
  20   lhs.low = num_eq (lhs, rhs);
  21   lhs.high = 0;
  22   lhs.overflow = 0;
  23   return lhs;
  24 }
  25
  26 int main()
  27 {
  28   cpp_num a = { 1, 2 };
  29   cpp_num b = { 3, 4 };
  30
  31   cpp_num result = num_equality_op (a, b);
  32   if (result.low)
  33     return 1;
  34
  35   result = num_equality_op (a, a);
  36   if (!result.low)
  37     return 2;
  38
  39   return 0;
  40 }