| // In Nanojit, loads and stores have a maximum displacement of 16-bits. Any |
| // displacements larger than that should be split off into a separate |
| // instruction that adds the displacement to the base pointer. This |
| // program tests if this is done correctly. |
| // |
| // x.y ends up having a dslot offset of 79988, because of the 20000 array |
| // elements before it. If Nanojit incorrectly stores this offset into a |
| // 16-bit value it will truncate to 14452 (because 79988 - 65536 == 14452). |
| // This means that the increments in the second loop will be done to one of |
| // the array elements instead of x.y. And so x.y's final value will be |
| // (99 + 8) instead of 1099. |
| // |
| // Note that setting x.y to 99 and checking its value at the end will |
| // access the correct location because those lines are interpreted. Phew. |
| |
| var x = {} |
| for (var i = 0; i < 20000; i++) |
| x[i] = 0; |
| x.y = 99; // not traced, correctly accessed |
| |
| for (var i = 0; i < 1000; ++i) { |
| x.y++; // traced, will access an array elem if disp was truncated |
| } |
| assertEq(x.y, 1099); // not traced, correctly accessed |
| |
