i8 in CodeAssembler

[Kixiron]

I've noticed that i8 aren't accepted for imm8 operands and instead there's checks to see if the given operand of 32 or 64 bit size fits into 8 bits, is that on purpose? Additionally, unsigned integers don't have any trait implementations when they could

[Kixiron]

I'm gonna kinda use this as a store of disjoint thoughts so I don't bog things down with multiple issues/discussions:

• There's no way to get a Register from any of the CodeAssembler register types
• There's no way to "downcast" a register, like doing from rax to al or from rbx to bl. This'd be a really nice utility function

[wtfsck]

I've noticed that i8 aren't accepted for imm8 operands and instead there's checks to see if the given operand of 32 or 64 bit size fits into 8 bits, is that on purpose?

To reduce the number of functions, it only accepts i32/u32 operands and sometimes i64/u64 operands.

Additionally, unsigned integers don't have any trait implementations when they could

All functions that accept i32 operands also accept u32 operands. In other words, the same trait is implemented twice once for i32 and once for u32.

* There's no way to get a `Register` from any of the `CodeAssembler` register types

Sounds like a feature request so it's better to create an issue.

Should be easy to fix, eg. impl From<AsmRegister16> for Register etc and maybe some into_register() methods.

* There's no way to "downcast" a register, like doing from `rax` to `al` or from `rbx` to `bl`. This'd be a really nice utility function

Should be an issue too.