Struct rustc_mir_transform::early_otherwise_branch::EarlyOtherwiseBranch

pub struct EarlyOtherwiseBranch;

This pass optimizes something like

let x: Option<()>;
let y: Option<()>;
match (x,y) {
    (Some(_), Some(_)) => {0},
    _ => {1}
}

into something like

let x: Option<()>;
let y: Option<()>;
let discriminant_x = // get discriminant of x
let discriminant_y = // get discriminant of y
if discriminant_x != discriminant_y || discriminant_x == None {1} else {0}

Trait Implementations

impl<'tcx> MirPass<'tcx> for EarlyOtherwiseBranch

fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>)

fn name(&self) -> Cow<'_, str>

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 0 bytes