Struct cranelift::prelude::isa::registers::RegClassData

pub struct RegClassData {
    pub name: &'static str,
    pub index: u8,
    pub width: u8,
    pub bank: u8,
    pub toprc: u8,
    pub first: u16,
    pub subclasses: u32,
    pub mask: [u32; 3],
    pub info: &'static RegInfo,
}

Data about a register class.

A register class represents a subset of the registers in a bank. It describes the set of permitted registers for a register operand in a given encoding of an instruction.

A register class can be a subset of another register class. The top-level register classes are disjoint.

Fields

name: &'static str

The name of the register class.

index: u8

The index of this class in the ISA's RegInfo description.

width: u8

How many register units to allocate per register.

bank: u8

Index of the register bank this class belongs to.

toprc: u8

Index of the top-level register class contains this one.

first: u16

The first register unit in this class.

subclasses: u32

Bit-mask of sub-classes of this register class, including itself.

Bits correspond to RC indexes.

mask: [u32; 3]

Mask of register units in the class. If width > 1, the mask only has a bit set for the first register unit in each allocatable register.

info: &'static RegInfo

The global RegInfo instance containing this register class.

Methods

impl RegClassData

pub fn intersect_index(
    &self,
    other: &'static RegClassData
) -> Option<RegClassIndex>

Get the register class index corresponding to the intersection of self and other.

This register class is guaranteed to exist if the register classes overlap. If the register classes don't overlap, returns None.

pub fn intersect(
    &self,
    other: &'static RegClassData
) -> Option<&'static RegClassData>

Get the intersection of self and other.

pub fn has_subclass<RCI>(&self, other: RCI) -> bool where
    RCI: Into<RegClassIndex>, 

Returns true if other is a subclass of this register class. A register class is considered to be a subclass of itself.

pub fn toprc(&self) -> &'static RegClassData

Get the top-level register class containing this class.

pub fn unit(&self, offset: usize) -> u16

Get a specific register unit in this class.

pub fn contains(&self, regunit: u16) -> bool

Does this register class contain regunit?

Trait Implementations

impl From<&'static RegClassData> for RegClassIndex

fn from(rc: &'static RegClassData) -> RegClassIndex

Performs the conversion.

impl Display for RegClassData

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

Formats the value using the given formatter.

impl Debug for RegClassData

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

Formats the value using the given formatter.

impl PartialEq<RegClassData> for RegClassData

Within an ISA, register classes are uniquely identified by their index.

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

This method tests for self and other values to be equal, and is used by ==.

#[must_use] fn ne(&self, other: &Rhs) -> bool

This method tests for !=.