gcc/testsuite/gcc.dg/compare5.c

   1 /* Test for a bogus warning on comparison between signed and unsigned.
   2    Origin: Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 8/21/2001.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-Wsign-compare" } */
   6
   7 extern void bar(void);
   8
   9 int foo(int x, int y, unsigned u)
  10 {
  11   /* A *_DIV_EXPR is non-negative if both operands are.  */
  12
  13   if (u < ((x=-22)/33)) /* { dg-warning "different signedness" "DIV_EXPR" } */
  14     return x;
  15
  16   if (u < ((x=22)/33))
  17     return x;
  18
  19   if (u < ((x=22)/(y=33)))
  20     return x;
  21
  22   if (u < (((x&0x10000)?128:64) / ((y&0x10000)?8:4)))
  23     return x;
  24
  25
  26   /* A *_MOD_EXPR is non-negative if the first operand is.  */
  27
  28   if (u < ((x=-22)%33)) /* { dg-warning "different signedness" "MOD_EXPR" } */
  29     return x;
  30
  31   if (u < ((x=22)%-33))
  32     return x;
  33
  34   if (u < ((x==y)%-33))
  35     return x;
  36
  37   if (u < (((x=22)/33)%-33))
  38     return x;
  39
  40   return 0;
  41 }