1 // PR c++/60049 - Right and left shift undefined behavior not an error
3 // { dg-do compile { target c++11 } }
4 // { dg-additional-options "-Wno-shift-negative-value -Wno-shift-count-negative -Wno-shift-count-overflow" }
6 constexpr int f1 (int n) { return 1 << n; } // { dg-error "shift expression" }
7 constexpr int f2 (int n) { return 1 << n; } // { dg-error "shift expression" }
8 constexpr int f3 (int n) { return n << 1; } // { dg-error "shift expression" }
9 constexpr int f4 (int n) { return 1 >> n; } // { dg-error "shift expression" }
10 constexpr int f5 (int n) { return 1 >> n; } // { dg-error "shift expression" }
12 constexpr int X = __CHAR_BIT__ * sizeof (int) + 1;
14 constexpr int x1 = f1 (X); // { dg-message "in .constexpr. expansion of" }
15 constexpr int x2 = f2 (-1); // { dg-message "in .constexpr. expansion of" }
16 constexpr int x3 = f3 (-1); // { dg-message "in .constexpr. expansion of" }
17 constexpr int x4 = f4 (X); // { dg-message "in .constexpr. expansion of" }
18 constexpr int x5 = f5 (-1); // { dg-message "in .constexpr. expansion of" }
20 constexpr int y1 = 1 << X; // { dg-error "shift expression" }
21 constexpr int y2 = 1 << -1; // { dg-error "shift expression" }
22 constexpr int y3 = -1 << 1; // { dg-error "shift expression" }
23 constexpr int y4 = 1 >> X; // { dg-error "shift expression" }
24 constexpr int y5 = 1 >> -1; // { dg-error "shift expression" }