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|
- // MIR for `foo` before GVN
+ // MIR for `foo` after GVN
fn foo(_1: &mut Option<i32>) -> Option<i32> {
debug v => _1;
let mut _0: std::option::Option<i32>;
let mut _2: &std::option::Option<i32>;
let mut _3: &std::option::Option<i32>;
let _4: &&mut std::option::Option<i32>;
let mut _5: isize;
let mut _7: !;
let mut _8: std::option::Option<i32>;
let mut _9: i32;
let mut _10: !;
let mut _11: &mut std::option::Option<i32>;
scope 1 {
debug col => _6;
let _6: i32;
}
bb0: {
- StorageLive(_2);
+ nop;
StorageLive(_3);
StorageLive(_4);
_4 = &_1;
- _11 = deref_copy (*_4);
- _3 = &(*_11);
+ _11 = copy _1;
+ _3 = &(*_1);
_2 = get(move _3) -> [return: bb1, unwind unreachable];
}
bb1: {
StorageDead(_3);
_5 = discriminant((*_2));
switchInt(move _5) -> [1: bb2, otherwise: bb3];
}
bb2: {
- StorageLive(_6);
+ nop;
_6 = copy (((*_2) as Some).0: i32);
StorageLive(_8);
- _8 = Option::<i32>::None;
- (*_1) = move _8;
+ _8 = const Option::<i32>::None;
+ (*_1) = const Option::<i32>::None;
StorageDead(_8);
StorageLive(_9);
_9 = copy _6;
- _0 = Option::<i32>::Some(move _9);
+ _0 = copy (*_2);
StorageDead(_9);
- StorageDead(_6);
+ nop;
StorageDead(_4);
- StorageDead(_2);
+ nop;
return;
}
bb3: {
StorageLive(_10);
unreachable;
}
+ }
+
+ ALLOC0 (size: 8, align: 4) {
+ 00 00 00 00 __ __ __ __ │ ....░░░░
}
|
