gcc/testsuite/gcc.dg/Wconversion-pr34389.c

   1 /* PR 34389 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-Wconversion -Wsign-conversion" } */
   4 /* { dg-require-effective-target int32plus } */
   5
   6 short  mask1(short x)
   7 {
   8   short y = 0x7fff;
   9   return x & y;
  10 }
  11
  12 short  mask2(short ssx)
  13 {
  14   short ssy;
  15   short ssz;
  16
  17   ssz = ((int)ssx) & 0x7fff;
  18   ssy = ((int)ssx) | 0x7fff;
  19   ssz = ((int)ssx) ^ 0x7fff;
  20   return ssx & 0x7fff;
  21 }
  22
  23 short  mask3(int si, unsigned int ui)
  24 {
  25   short ss;
  26   unsigned short us;
  27
  28   ss = si & 0x7fff;
  29   ss = si & 0xAAAA; /* { dg-warning "conversion" } */
  30   ss = ui & 0x7fff;
  31   ss = ui & 0xAAAA; /* { dg-warning "conversion" } */
  32
  33   us = si & 0x7fff;
  34   us = si & 0xAAAA; /* { dg-warning "conversion" } */
  35   us = ui & 0x7fff;
  36   us = ui & 0xAAAA; /* 0xAAAA is zero-extended, thus it masks the
  37                        upper bits of 'ui' making it fit in 'us'.  */
  38
  39   return ss;
  40 }
  41
  42 short  mask4(int x, int y)
  43 {
  44   return x & y; /* { dg-warning "conversion" } */
  45 }
  46
  47 short  mask5(int x)
  48 {
  49   return x & -1; /* { dg-warning "conversion" } */
  50 }
  51
  52 short  mask6(short x)
  53 {
  54   return x & -1;
  55 }