Struct OperandDesc 

pub struct OperandDesc {
    pub class: RegClass,
    pub role: Role,
    pub constraint: Constraint,
}

One operand of one instruction, as a target’s description of that instruction writes it.

The difference from an operand in the machine IR is the register: there is none here, because a description is about every instruction of that opcode and a register belongs to one of them.

Fields

class: RegClass

The class the operand is drawn from.

role: Role

Whether the instruction reads it or writes it.

constraint: Constraint

Where it is allowed to live.

Implementations

impl OperandDesc

pub const fn read(class: RegClass) -> Self

An operand the instruction reads, in any register of its class.

pub const fn write(class: RegClass) -> Self

An operand the instruction writes as it finishes.

pub const fn write_early(class: RegClass) -> Self

An operand the instruction writes before it has finished reading, which is what a register the instruction destroys on its way through is.

pub const fn with(self, constraint: Constraint) -> Self

The same operand, constrained.

Trait Implementations

impl Clone for OperandDesc

fn clone(&self) -> OperandDesc

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for OperandDesc

impl Debug for OperandDesc

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for OperandDesc

impl PartialEq for OperandDesc

fn eq(&self, other: &OperandDesc) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for OperandDesc