RFR: 8276563: Undefined Behaviour in class Assembler

[Thomas Stuefe]

On Sat, 6 Nov 2021 16:15:44 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> It's not clear to me why `Register` is implemented as a pointer in the first place, instead of a class with a single `int` or `intptr_t` field for the encoding. There is a comment about that in register.hpp, but it doesn't offer an explanation:

I believe the point is to encode the register number in the `this` pointer. If it were a member, you'd have to dereference the pointer to access the member value, so one more load instruction.

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PR: https://git.openjdk.java.net/jdk/pull/6280