Struct VReg 

pub struct VReg(/* private fields */);

A virtual register: an index into a function’s virtual-register table.

Virtual registers are created by Function::vreg, each with a RegClass, and printed as %N.

Examples

use backend_lang::mir::Function;
use backend_lang::x86_64::{GPR, SYSV};

let mut f = Function::new("f", &SYSV);
let v = f.vreg(GPR).unwrap();
assert_eq!(v.as_virt().map(|v| v.index()), Some(0));
assert_eq!(f.vreg_class(v.as_virt().unwrap()), Some(GPR));

Implementations

impl VReg

pub const MAX: usize

The most virtual registers one function may have: indexes use 31 bits, because Reg keeps the top bit to tell the two kinds apart.

pub const fn index(self) -> usize

The register’s index in its function’s virtual-register table.

Examples

use backend_lang::mir::Function;
use backend_lang::x86_64::{GPR, SYSV};

let mut f = Function::new("f", &SYSV);
let _ = f.vreg(GPR).unwrap();
let second = f.vreg(GPR).unwrap().as_virt().unwrap();
assert_eq!(second.index(), 1);

Trait Implementations

impl Clone for VReg

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for VReg

impl Debug for VReg

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

Formats the value using the given formatter.

impl Eq for VReg

impl From<VReg> for Reg

fn from(v: VReg) -> Reg

Converts to this type from the input type.

impl Hash for VReg

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for VReg

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for VReg

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for VReg

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for VReg