rust/tests/mir-opt/pre-codegen/loops.int_range.PreCodegen.after.mir

// MIR for `int_range` after PreCodegen

fn int_range(_1: usize, _2: usize) -> () {
    debug start => _1;
    debug end => _2;
    let mut _0: ();
    let mut _3: std::ops::Range<usize>;
    let mut _9: std::option::Option<usize>;
    let _11: ();
    let mut _12: &mut std::ops::Range<usize>;
    scope 1 {
        debug iter => _3;
        let _10: usize;
        scope 2 {
            debug i => _10;
        }
        scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<usize>>::next) {
            debug self => _12;
            scope 5 (inlined <std::ops::Range<usize> as iter::range::RangeIteratorImpl>::spec_next) {
                debug self => _12;
                let mut _6: bool;
                let _7: usize;
                let mut _8: usize;
                let mut _13: &usize;
                let mut _14: &usize;
                scope 6 {
                    debug old => _7;
                    scope 8 (inlined <usize as Step>::forward_unchecked) {
                        debug start => _7;
                        debug n => const 1_usize;
                        scope 9 (inlined #[track_caller] core::num::<impl usize>::unchecked_add) {
                            debug self => _7;
                            debug rhs => const 1_usize;
                            scope 10 (inlined core::ub_checks::check_language_ub) {
                                scope 11 (inlined core::ub_checks::check_language_ub::runtime) {
                                }
                            }
                        }
                    }
                }
                scope 7 (inlined std::cmp::impls::<impl PartialOrd for usize>::lt) {
                    debug self => _13;
                    debug other => _14;
                    let mut _4: usize;
                    let mut _5: usize;
                }
            }
        }
    }
    scope 3 (inlined <std::ops::Range<usize> as IntoIterator>::into_iter) {
        debug self => _3;
    }

    bb0: {
        _3 = std::ops::Range::<usize> { start: copy _1, end: copy _2 };
        goto -> bb1;
    }

    bb1: {
        StorageLive(_9);
        // DBG: _12 = &_3;
        StorageLive(_6);
        // DBG: _13 = &(_3.0: usize);
        // DBG: _14 = &(_3.1: usize);
        StorageLive(_4);
        _4 = copy (_3.0: usize);
        StorageLive(_5);
        _5 = copy (_3.1: usize);
        _6 = Lt(move _4, move _5);
        StorageDead(_5);
        StorageDead(_4);
        switchInt(move _6) -> [0: bb2, otherwise: bb3];
    }

    bb2: {
        StorageDead(_6);
        StorageDead(_9);
        return;
    }

    bb3: {
        _7 = copy (_3.0: usize);
        StorageLive(_8);
        _8 = AddUnchecked(copy _7, const 1_usize);
        (_3.0: usize) = move _8;
        StorageDead(_8);
        _9 = Option::<usize>::Some(copy _7);
        StorageDead(_6);
        _10 = copy ((_9 as Some).0: usize);
        _11 = opaque::<usize>(move _10) -> [return: bb4, unwind continue];
    }

    bb4: {
        StorageDead(_9);
        goto -> bb1;
    }
}