How do modern compilers choose which variables to put in registers?

How can we compare expressive power between two Turing-complete languages?

You could have invented denotational semantics

What are the ways compilers recognize complex patterns?

Why do (or don't) languages forbid unreachable code?

Why does Rust choose not to provide `for` comprehensions?

How to ensure that an optimising compiler will terminate?

How should I read type system notation?

How can we compare expressive power between two Turing-complete languages?