gcc/testsuite/gcc.dg/Wconversion-5.c

   1 /* PR c++/34198 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -Wconversion" } */
   4
   5 signed char sc;
   6 unsigned char uc;
   7 short int ss;
   8 unsigned short int us;
   9 int si;
  10 unsigned int ui;
  11
  12 void test1 (void)
  13 {
  14   int a = uc & 0xff;
  15   int b = sc & 0x7f;
  16   int c = 0xff & uc;
  17   int d = 0x7f & sc;
  18   int e = uc & sc;
  19   unsigned char f = (int) uc;
  20   signed char g = (int) sc;
  21   unsigned char h = (unsigned int) (short int) uc;
  22   signed char i = (int) (unsigned short int) sc;        /* { dg-warning "may alter its value" "" { target { int32plus } } } */
  23   unsigned char j = (unsigned int) (short int) us;      /* { dg-warning "may alter its value" } */
  24   signed char k = (int) (unsigned short int) ss;        /* { dg-warning "may alter its value" } */
  25 }
  26
  27 void test2 (void)
  28 {
  29   signed char a = (unsigned char) sc;           /* { dg-warning "may change the sign" } */
  30   unsigned char b = (signed char) uc;           /* { dg-warning "may change the sign" } */
  31   signed char c = (int) (unsigned char) sc;     /* { dg-warning "may change the sign" } */
  32   unsigned char d = (int) (signed char) uc;     /* { dg-warning "may change the sign" } */
  33   int e = (unsigned int) si;                    /* { dg-warning "may change the sign" } */
  34   unsigned int f = (int) ui;                    /* { dg-warning "may change the sign" } */
  35 }