awilfox wrote: > This violates aliasing rules and doesn't work at all on big-endian 64-bit > systems where the pointer is stored in the second four bytes of the uint64_t.
Your sizes aren't correct in the description here. This issue occurs on big endian 32-bit systems, and the pointer is stored in the lower bits, which are lost because of using address-of when turning the 64-bit number into a pointer. i.e. storing 0x12345678 yields: ``` |---------------------------| | XXXX | XXXX | 1234 | 5678 | |---------------------------| ``` If you just cast down to a `uintptr_t` (or such), you get the correct value. But if you point to the *address of* this 64-bit value, and access a 32-bit value, you receive the `XXXX'XXXX` instead of `1234'5678`. https://github.com/llvm/llvm-project/pull/112806 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
