gcc/testsuite/c-c++-common/Wshift-overflow-3.c

   1 /* PR c++/55095 */
   2 /* { dg-do compile { target int32 } } */
   3 /* { dg-options "-O -Wshift-overflow" } */
   4 /* { dg-additional-options "-std=gnu90" { target c } } */
   5 /* { dg-additional-options "-std=c++03" { target c++ } } */
   6
   7 #define INTM1 (sizeof (int) * __CHAR_BIT__ - 1)
   8 #define INTM2 (sizeof (int) * __CHAR_BIT__ - 2)
   9 #define LLONGM1 (sizeof (long long) * __CHAR_BIT__ - 1)
  10 #define LLONGM2 (sizeof (long long) * __CHAR_BIT__ - 2)
  11
  12 #define INT_MIN (-__INT_MAX__-1)
  13 #define LONG_LONG_MIN (-__LONG_LONG_MAX__-1)
  14
  15 int i1 = 1 << INTM1;
  16 int i2 = 9 << INTM1; /* { dg-warning "requires 36 bits to represent" } */
  17 int i3 = 10 << INTM2; /* { dg-warning "requires 35 bits to represent" } */
  18 int i4 = __INT_MAX__ << 2; /* { dg-warning "requires 34 bits to represent" } */
  19 int i5 = __INT_MAX__ << INTM1; /* { dg-warning "requires 63 bits to represent" } */
  20 int i6 = -1 << INTM1;
  21 int i7 = -9 << INTM1; /* { dg-warning "requires 36 bits to represent" } */
  22 int i8 = -10 << INTM2; /* { dg-warning "requires 35 bits to represent" } */
  23 int i9 = -__INT_MAX__ << 2; /* { dg-warning "requires 34 bits to represent" } */
  24 int i10 = -__INT_MAX__ << INTM1; /* { dg-warning "requires 63 bits to represent" } */
  25 int i11 = INT_MIN << 1; /* { dg-warning "requires 33 bits to represent" } */
  26
  27 int r1 = 1 >> INTM1;
  28 int r2 = 9 >> INTM1;
  29 int r3 = 10 >> INTM2;
  30 int r4 = __INT_MAX__ >> 2;
  31 int r5 = __INT_MAX__ >> INTM1;
  32 int r6 = -1 >> INTM1;
  33 int r7 = -9 >> INTM1;
  34 int r8 = -10 >> INTM2;
  35 int r9 = -__INT_MAX__ >> 2;
  36 int r10 = -__INT_MAX__ >> INTM1;
  37
  38 unsigned u1 = 1 << INTM1;
  39 unsigned u2 = 9 << INTM1; /* { dg-warning "requires 36 bits to represent" } */
  40 unsigned u3 = 2U << INTM1;
  41 unsigned u4 = 9U << INTM1;
  42 unsigned u5 = 10U << INTM2;
  43
  44 long long int l1 = 1LL << LLONGM1;
  45 long long int l2 = 9LL << LLONGM1; /* { dg-warning "requires 68 bits to represent" } */
  46 long long int l3 = 10LL << LLONGM2; /* { dg-warning "requires 67 bits to represent" } */
  47 long long int l4 = __LONG_LONG_MAX__ << 2; /* { dg-warning "requires 66 bits to represent" } */
  48 long long int l5 = __LONG_LONG_MAX__ << LLONGM1; /* { dg-warning "requires 127 bits to represent" } */
  49 long long int l6 = -1LL << LLONGM1;
  50 long long int l7 = -9LL << LLONGM1; /* { dg-warning "requires 68 bits to represent" } */
  51 long long int l8 = -10LL << LLONGM2; /* { dg-warning "requires 67 bits to represent" } */
  52 long long int l9 = -__LONG_LONG_MAX__ << 2; /* { dg-warning "requires 66 bits to represent" } */
  53 long long int l10 = -__LONG_LONG_MAX__ << LLONGM1; /* { dg-warning "requires 127 bits to represent" } */
  54 long long int l11 = LONG_LONG_MIN << 1; /* { dg-warning "requires 65 bits to represent" } */
  55
  56 void
  57 fn (void)
  58 {
  59   const int a = 10;
  60   const __SIZE_TYPE__ b = INTM1;
  61   int k1 = a << b; /* { dg-warning "requires 36 bits to represent" } */
  62   int k2 = 10 << b; /* { dg-warning "requires 36 bits to represent" } */
  63   int k3 = a << INTM1; /* { dg-warning "requires 36 bits to represent" } */
  64 }