rust/tests/mir-opt/simplify_locals_removes_unused_discriminant_reads.rs

// unit-test: SimplifyLocals-before-const-prop

fn map(x: Option<Box<()>>) -> Option<Box<()>> {
    match x {
        None => None,
        Some(x) => Some(x),
    }
}

fn main() {
    map(None);
}

// EMIT_MIR simplify_locals_removes_unused_discriminant_reads.map.SimplifyLocals-before-const-prop.diff
Move SimplifyLocals before ConstProp. 2022-12-04 13:20:55 -06:00			`// unit-test: SimplifyLocals-before-const-prop`
Disable the SimplifyArmIdentity mir-opt The optimization still has some bugs that need to be worked out such as #77359. We can try re-enabling this again after the known issues are resolved. 2020-09-30 19:04:19 -05:00
Remove unused discriminant reads from MIR bodies Allow the `SimplifyLocals` pass to remove reads of discriminants if the read is never used. 2020-03-30 08:56:52 -05:00			`fn map(x: Option<Box<()>>) -> Option<Box<()>> {`
			`match x {`
			`None => None,`
			`Some(x) => Some(x),`
			`}`
			`}`

			`fn main() {`
			`map(None);`
			`}`

Move SimplifyLocals before ConstProp. 2022-12-04 13:20:55 -06:00			`// EMIT_MIR simplify_locals_removes_unused_discriminant_reads.map.SimplifyLocals-before-const-prop.diff`