Struct rustc_mir_transform::match_branches::MatchBranchSimplification

pub struct MatchBranchSimplification;

Trait Implementations

impl<'tcx> MirPass<'tcx> for MatchBranchSimplification

If a source block is found that switches between two blocks that are exactly the same modulo const bool assignments (e.g., one assigns true another false to the same place), merge a target block statements into the source block, using Eq / Ne comparison with switch value where const bools value differ.

For example:

bb0: {
    switchInt(move _3) -> [42_isize: bb1, otherwise: bb2];
}

bb1: {
    _2 = const true;
    goto -> bb3;
}

bb2: {
    _2 = const false;
    goto -> bb3;
}

into:

bb0: {
   _2 = Eq(move _3, const 42_isize);
   goto -> bb3;
}

fn is_enabled(&self, sess: &Session) -> bool

Returns true if this pass is enabled with the current combination of compiler flags.

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

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

fn phase_change(&self) -> Option<MirPhase>

If this pass causes the MIR to enter a new phase, return that phase.

fn is_mir_dump_enabled(&self) -> bool

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