For arbitrary pointers no. But it could special-case e.g. string constants in the source code and/or pointers returned by some intern function (which is also how the JVM does it - for arbitrary strings, even though they're objects, it's always possible that the object has been GCed and another string allocated at the same location).

For example, recently I wanted to call `gettid()` in a signal handler. Which I guessed was just a simple wrapper around the syscall.

However, it seems this can cache the thread ID in thread local storage (can't remember exact details).

I switched to making a syscall instead.