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Auto merge of #91840 - JakobDegen:fix_early_otherwise, r=oli-obk
Fix the unsoundness in the `early_otherwise_branch` mir opt pass Closes #78496 . This change is a significant rewrite of much of the pass. Exactly what it does is documented in the source file (with ascii art!), and all the changes that are made to the MIR that are not trivially sound are carefully documented. That being said, this is my first time touching MIR, so there are probably some invariants I did not know about that I broke. This version of the optimization is also somewhat more flexible than the original; for example, we do not care how or where the value on which the parent is switching is computed. There is no requirement that any types be the same. This could be made even more flexible in the future by allowing a wider range of statements in the bodies of `BBC, BBD` (as long as they are all the same of course). This should be a good first step though. Probably needs a perf run. r? `@oli-obk` who reviewed things the last time this was touched
2 parents 788b1fe + c0c13b7 commit a7f3757

13 files changed

+526
-371
lines changed

‎compiler/rustc_mir_transform/src/early_otherwise_branch.rs

+307-274
Large diffs are not rendered by default.

‎src/test/mir-opt/early_otherwise_branch.opt1.EarlyOtherwiseBranch.diff

+5-5
Original file line numberDiff line numberDiff line change
@@ -12,8 +12,8 @@
1212
let mut _7: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:5:10: 5:17
1313
let _8: u32; // in scope 0 at $DIR/early_otherwise_branch.rs:5:15: 5:16
1414
let _9: u32; // in scope 0 at $DIR/early_otherwise_branch.rs:5:24: 5:25
15-
+ let mut _10: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:5:19: 5:26
16-
+ let mut _11: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:5:19: 5:26
15+
+ let mut _10: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
16+
+ let mut _11: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
1717
scope 1 {
1818
debug a => _8; // in scope 1 at $DIR/early_otherwise_branch.rs:5:15: 5:16
1919
debug b => _9; // in scope 1 at $DIR/early_otherwise_branch.rs:5:24: 5:25
@@ -34,7 +34,7 @@
3434
+ StorageLive(_10); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
3535
+ _10 = discriminant((_3.1: std::option::Option<u32>)); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
3636
+ StorageLive(_11); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
37-
+ _11 = Ne(_10, _7); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
37+
+ _11 = Ne(_7, move _10); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
3838
+ StorageDead(_10); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
3939
+ switchInt(move _11) -> [false: bb4, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
4040
}
@@ -70,8 +70,8 @@
7070
+ }
7171
+
7272
+ bb4: {
73-
+ StorageDead(_11); // scope 0 at $DIR/early_otherwise_branch.rs:5:19: 5:26
74-
+ switchInt(_7) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:5:19: 5:26
73+
+ StorageDead(_11); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
74+
+ switchInt(_7) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
7575
}
7676
}
7777

‎src/test/mir-opt/early_otherwise_branch.opt2.EarlyOtherwiseBranch.diff

+5-5
Original file line numberDiff line numberDiff line change
@@ -13,8 +13,8 @@
1313
let mut _8: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:13:10: 13:17
1414
let _9: u32; // in scope 0 at $DIR/early_otherwise_branch.rs:13:15: 13:16
1515
let _10: u32; // in scope 0 at $DIR/early_otherwise_branch.rs:13:24: 13:25
16-
+ let mut _11: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:14:16: 14:20
17-
+ let mut _12: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:14:16: 14:20
16+
+ let mut _11: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
17+
+ let mut _12: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
1818
scope 1 {
1919
debug a => _9; // in scope 1 at $DIR/early_otherwise_branch.rs:13:15: 13:16
2020
debug b => _10; // in scope 1 at $DIR/early_otherwise_branch.rs:13:24: 13:25
@@ -35,7 +35,7 @@
3535
+ StorageLive(_11); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
3636
+ _11 = discriminant((_3.1: std::option::Option<u32>)); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
3737
+ StorageLive(_12); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
38-
+ _12 = Ne(_11, _8); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
38+
+ _12 = Ne(_8, move _11); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
3939
+ StorageDead(_11); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
4040
+ switchInt(move _12) -> [false: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
4141
}
@@ -84,8 +84,8 @@
8484
+ }
8585
+
8686
+ bb5: {
87-
+ StorageDead(_12); // scope 0 at $DIR/early_otherwise_branch.rs:14:16: 14:20
88-
+ switchInt(_8) -> [0_isize: bb3, 1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:14:16: 14:20
87+
+ StorageDead(_12); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
88+
+ switchInt(_8) -> [0_isize: bb3, 1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
8989
}
9090
}
9191

‎src/test/mir-opt/early_otherwise_branch.opt3.EarlyOtherwiseBranch.diff

+77
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,77 @@
1+
- // MIR for `opt3` before EarlyOtherwiseBranch
2+
+ // MIR for `opt3` after EarlyOtherwiseBranch
3+
4+
fn opt3(_1: Option<u32>, _2: Option<bool>) -> u32 {
5+
debug x => _1; // in scope 0 at $DIR/early_otherwise_branch.rs:21:9: 21:10
6+
debug y => _2; // in scope 0 at $DIR/early_otherwise_branch.rs:21:25: 21:26
7+
let mut _0: u32; // return place in scope 0 at $DIR/early_otherwise_branch.rs:21:45: 21:48
8+
let mut _3: (std::option::Option<u32>, std::option::Option<bool>); // in scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
9+
let mut _4: std::option::Option<u32>; // in scope 0 at $DIR/early_otherwise_branch.rs:22:12: 22:13
10+
let mut _5: std::option::Option<bool>; // in scope 0 at $DIR/early_otherwise_branch.rs:22:15: 22:16
11+
let mut _6: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:23:19: 23:26
12+
let mut _7: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:23:10: 23:17
13+
let _8: u32; // in scope 0 at $DIR/early_otherwise_branch.rs:23:15: 23:16
14+
let _9: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:23:24: 23:25
15+
+ let mut _10: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
16+
+ let mut _11: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
17+
scope 1 {
18+
debug a => _8; // in scope 1 at $DIR/early_otherwise_branch.rs:23:15: 23:16
19+
debug b => _9; // in scope 1 at $DIR/early_otherwise_branch.rs:23:24: 23:25
20+
}
21+
22+
bb0: {
23+
StorageLive(_3); // scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
24+
StorageLive(_4); // scope 0 at $DIR/early_otherwise_branch.rs:22:12: 22:13
25+
_4 = _1; // scope 0 at $DIR/early_otherwise_branch.rs:22:12: 22:13
26+
StorageLive(_5); // scope 0 at $DIR/early_otherwise_branch.rs:22:15: 22:16
27+
_5 = _2; // scope 0 at $DIR/early_otherwise_branch.rs:22:15: 22:16
28+
(_3.0: std::option::Option<u32>) = move _4; // scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
29+
(_3.1: std::option::Option<bool>) = move _5; // scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
30+
StorageDead(_5); // scope 0 at $DIR/early_otherwise_branch.rs:22:16: 22:17
31+
StorageDead(_4); // scope 0 at $DIR/early_otherwise_branch.rs:22:16: 22:17
32+
_7 = discriminant((_3.0: std::option::Option<u32>)); // scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
33+
- switchInt(move _7) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
34+
+ StorageLive(_10); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
35+
+ _10 = discriminant((_3.1: std::option::Option<bool>)); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
36+
+ StorageLive(_11); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
37+
+ _11 = Ne(_7, move _10); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
38+
+ StorageDead(_10); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
39+
+ switchInt(move _11) -> [false: bb4, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
40+
}
41+
42+
bb1: {
43+
+ StorageDead(_11); // scope 0 at $DIR/early_otherwise_branch.rs:24:14: 24:15
44+
_0 = const 1_u32; // scope 0 at $DIR/early_otherwise_branch.rs:24:14: 24:15
45+
- goto -> bb4; // scope 0 at $DIR/early_otherwise_branch.rs:24:14: 24:15
46+
+ goto -> bb3; // scope 0 at $DIR/early_otherwise_branch.rs:24:14: 24:15
47+
}
48+
49+
bb2: {
50+
- _6 = discriminant((_3.1: std::option::Option<bool>)); // scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
51+
- switchInt(move _6) -> [1_isize: bb3, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
52+
- }
53+
-
54+
- bb3: {
55+
StorageLive(_8); // scope 0 at $DIR/early_otherwise_branch.rs:23:15: 23:16
56+
_8 = (((_3.0: std::option::Option<u32>) as Some).0: u32); // scope 0 at $DIR/early_otherwise_branch.rs:23:15: 23:16
57+
StorageLive(_9); // scope 0 at $DIR/early_otherwise_branch.rs:23:24: 23:25
58+
_9 = (((_3.1: std::option::Option<bool>) as Some).0: bool); // scope 0 at $DIR/early_otherwise_branch.rs:23:24: 23:25
59+
_0 = const 0_u32; // scope 1 at $DIR/early_otherwise_branch.rs:23:31: 23:32
60+
StorageDead(_9); // scope 0 at $DIR/early_otherwise_branch.rs:23:31: 23:32
61+
StorageDead(_8); // scope 0 at $DIR/early_otherwise_branch.rs:23:31: 23:32
62+
- goto -> bb4; // scope 0 at $DIR/early_otherwise_branch.rs:23:31: 23:32
63+
+ goto -> bb3; // scope 0 at $DIR/early_otherwise_branch.rs:23:31: 23:32
64+
}
65+
66+
- bb4: {
67+
+ bb3: {
68+
StorageDead(_3); // scope 0 at $DIR/early_otherwise_branch.rs:26:1: 26:2
69+
return; // scope 0 at $DIR/early_otherwise_branch.rs:26:2: 26:2
70+
+ }
71+
+
72+
+ bb4: {
73+
+ StorageDead(_11); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
74+
+ switchInt(_7) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
75+
}
76+
}
77+

‎src/test/mir-opt/early_otherwise_branch.rs

+10
Original file line numberDiff line numberDiff line change
@@ -16,7 +16,17 @@ fn opt2(x: Option<u32>, y: Option<u32>) -> u32 {
1616
}
1717
}
1818

19+
// optimize despite different types
20+
// EMIT_MIR early_otherwise_branch.opt3.EarlyOtherwiseBranch.diff
21+
fn opt3(x: Option<u32>, y: Option<bool>) -> u32 {
22+
match (x, y) {
23+
(Some(a), Some(b)) => 0,
24+
_ => 1,
25+
}
26+
}
27+
1928
fn main() {
2029
opt1(None, Some(0));
2130
opt2(None, Some(0));
31+
opt3(None, Some(false));
2232
}

‎src/test/mir-opt/early_otherwise_branch_3_element_tuple.opt1.EarlyOtherwiseBranch.diff

+7-7
Original file line numberDiff line numberDiff line change
@@ -16,10 +16,10 @@
1616
let _11: u32; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:15: 6:16
1717
let _12: u32; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:24: 6:25
1818
let _13: u32; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:33: 6:34
19-
+ let mut _14: isize; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:19: 6:26
20-
+ let mut _15: bool; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:19: 6:26
21-
+ let mut _16: isize; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:28: 6:35
22-
+ let mut _17: bool; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:28: 6:35
19+
+ let mut _14: isize; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
20+
+ let mut _15: bool; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
21+
+ let mut _16: isize; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
22+
+ let mut _17: bool; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
2323
scope 1 {
2424
debug a => _11; // in scope 1 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:15: 6:16
2525
debug b => _12; // in scope 1 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:24: 6:25
@@ -45,7 +45,7 @@
4545
+ StorageLive(_14); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
4646
+ _14 = discriminant((_4.1: std::option::Option<u32>)); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
4747
+ StorageLive(_15); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
48-
+ _15 = Ne(_14, _10); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
48+
+ _15 = Ne(_10, move _14); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
4949
+ StorageDead(_14); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
5050
+ switchInt(move _15) -> [false: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
5151
}
@@ -92,8 +92,8 @@
9292
+ }
9393
+
9494
+ bb5: {
95-
+ StorageDead(_15); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:19: 6:26
96-
+ switchInt(_10) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:19: 6:26
95+
+ StorageDead(_15); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
96+
+ switchInt(_10) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
9797
}
9898
}
9999

‎src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.before-SimplifyConstCondition-final.after.diff

+5-5
Original file line numberDiff line numberDiff line change
@@ -36,8 +36,8 @@
3636
let mut _31: f32; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:25:50: 25:55
3737
let mut _32: !; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:26:14: 26:28
3838
let mut _33: (); // in scope 0 at $DIR/early_otherwise_branch_68867.rs:26:25: 26:27
39-
+ let mut _34: isize; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
40-
+ let mut _35: bool; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
39+
+ let mut _34: isize; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
40+
+ let mut _35: bool; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
4141
scope 1 {
4242
- debug one => _12; // in scope 1 at $DIR/early_otherwise_branch_68867.rs:22:14: 22:17
4343
- debug other => _13; // in scope 1 at $DIR/early_otherwise_branch_68867.rs:22:24: 22:29
@@ -85,7 +85,7 @@
8585
+ StorageLive(_34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
8686
+ _34 = discriminant((*(_4.1: &ViewportPercentageLength))); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
8787
+ StorageLive(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
88-
+ _35 = Ne(_34, _11); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
88+
+ _35 = Ne(_11, move _34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
8989
+ StorageDead(_34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
9090
+ switchInt(move _35) -> [false: bb7, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
9191
}
@@ -293,8 +293,8 @@
293293
- StorageDead(_3); // scope 0 at $DIR/early_otherwise_branch_68867.rs:27:6: 27:7
294294
- StorageDead(_4); // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:1: 28:2
295295
- return; // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:2: 28:2
296-
+ StorageDead(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
297-
+ switchInt(_11) -> [0_isize: bb2, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
296+
+ StorageDead(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
297+
+ switchInt(_11) -> [0_isize: bb2, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
298298
}
299299
}
300300

‎src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.diff

+5-5
Original file line numberDiff line numberDiff line change
@@ -36,8 +36,8 @@
3636
let mut _31: f32; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:25:50: 25:55
3737
let mut _32: !; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:26:14: 26:28
3838
let mut _33: (); // in scope 0 at $DIR/early_otherwise_branch_68867.rs:26:25: 26:27
39-
+ let mut _34: isize; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
40-
+ let mut _35: bool; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
39+
+ let mut _34: isize; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
40+
+ let mut _35: bool; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
4141
scope 1 {
4242
debug one => _12; // in scope 1 at $DIR/early_otherwise_branch_68867.rs:22:14: 22:17
4343
debug other => _13; // in scope 1 at $DIR/early_otherwise_branch_68867.rs:22:24: 22:29
@@ -71,7 +71,7 @@
7171
+ StorageLive(_34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
7272
+ _34 = discriminant((*(_4.1: &ViewportPercentageLength))); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
7373
+ StorageLive(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
74-
+ _35 = Ne(_34, _11); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
74+
+ _35 = Ne(_11, move _34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
7575
+ StorageDead(_34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
7676
+ switchInt(move _35) -> [false: bb7, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
7777
}
@@ -209,8 +209,8 @@
209209
+ }
210210
+
211211
+ bb7: {
212-
+ StorageDead(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
213-
+ switchInt(_11) -> [0_isize: bb2, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
212+
+ StorageDead(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
213+
+ switchInt(_11) -> [0_isize: bb2, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
214214
}
215215
}
216216

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