Type Alias RegClass 

pub type RegClass = RegClass;

A register class. Each register in the ISA has one class, and the classes are disjoint. Most modern ISAs will have just two classes: the integer/general-purpose registers (GPRs), and the float/vector registers (typically used for both).

Note that unlike some other compiler backend/register allocator designs, we do not allow for overlapping classes, i.e. registers that belong to more than one class, because doing so makes the allocation problem significantly more complex. Instead, when a register can be addressed under different names for different sizes (for example), the backend author should pick classes that denote some fundamental allocation unit that encompasses the whole register. For example, always allocate 128-bit vector registers v0..vN, even though f32 and f64 values may use only the low 32/64 bits of those registers and name them differently.

Aliased Type

pub enum RegClass {
    Int = 0,
    Float = 1,
    Vector = 2,
}

Variants

Int = 0

Float = 1

Vector = 2