On x86 if [mem] is not 32-bit aligned, can "lock inc [mem]" still work fine?

Question

On x86, if mem is 32-bit aligned, the mov operation is guaranteed to be atomic.

if [mem] is not 32-bit aligned, can lock inc [mem] sill work fine?

work fine:provide atomicity and not get partial value.

Answer 1

The Intel Instruction Set Reference for x86 and x64 mentions nothing about alignment requirements for the INC instruction. All it says in reference to LOCK is:

This instruction can be used with a LOCK prefix to allow the instruction to be executed atomically.

The LOCK prefix documentation states:

The integrity of the LOCK prefix is not affected by the alignment of the memory field. Memory locking is observed for arbitrarily misaligned fields.