bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Add regression test showcasing miscompilation

Browse source
This commit is contained in:
Simon Vandel Sillesen 2020-09-17 18:27:49 +02:00
parent fd702d2919
commit cad050b002
2 changed files with 49 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

30
src/test/mir-opt/76803_regression.encode.SimplifyBranchSame.diff Normal file
View file

@ -0,0 +1,30 @@
- // MIR for `encode` before SimplifyBranchSame
+ // MIR for `encode` after SimplifyBranchSame
fn encode(_1: Type) -> Type {
debug v => _1; // in scope 0 at $DIR/76803_regression.rs:10:15: 10:16
let mut _0: Type; // return place in scope 0 at $DIR/76803_regression.rs:10:27: 10:31
let mut _2: isize; // in scope 0 at $DIR/76803_regression.rs:12:9: 12:16
bb0: {
_2 = discriminant(_1); // scope 0 at $DIR/76803_regression.rs:12:9: 12:16
- switchInt(move _2) -> [0_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/76803_regression.rs:12:9: 12:16
+ goto -> bb1; // scope 0 at $DIR/76803_regression.rs:12:9: 12:16
}
bb1: {
_0 = move _1; // scope 0 at $DIR/76803_regression.rs:13:14: 13:15
- goto -> bb3; // scope 0 at $DIR/76803_regression.rs:11:5: 14:6
+ goto -> bb2; // scope 0 at $DIR/76803_regression.rs:11:5: 14:6
}
bb2: {
- discriminant(_0) = 1; // scope 0 at $DIR/76803_regression.rs:12:20: 12:27
- goto -> bb3; // scope 0 at $DIR/76803_regression.rs:11:5: 14:6
- }
-
- bb3: {
return; // scope 0 at $DIR/76803_regression.rs:15:2: 15:2
}
}

19
src/test/mir-opt/76803_regression.rs Normal file
View file

@ -0,0 +1,19 @@
// compile-flags: -Z mir-opt-level=1
// EMIT_MIR 76803_regression.encode.SimplifyBranchSame.diff
#[derive(Debug, Eq, PartialEq)]
pub enum Type {
A,
B,
}
pub fn encode(v: Type) -> Type {
match v {
Type::A => Type::B,
_ => v,
}
}
fn main() {
assert_eq!(Type::B, encode(Type::A));
}