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Commit 0783009

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JakobDegenJakobDegen
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Add test checking that fallthrough branches are correctly identified as dead
1 parent 3a5c078 commit 0783009

6 files changed

+128
-17
lines changed

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

Lines changed: 5 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -31,7 +31,7 @@
3131
StorageDead(_5); // scope 0 at $DIR/early_otherwise_branch.rs:12:16: 12:17
3232
StorageDead(_4); // scope 0 at $DIR/early_otherwise_branch.rs:12:16: 12:17
3333
_8 = discriminant((_3.0: std::option::Option<u32>)); // scope 0 at $DIR/early_otherwise_branch.rs:12:11: 12:17
34-
- switchInt(move _8) -> [0_isize: bb1, 1_isize: bb3, otherwise: bb2]; // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
34+
- switchInt(move _8) -> [0_isize: bb1, 1_isize: bb3, otherwise: bb7]; // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
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
@@ -81,8 +81,10 @@
8181
+ bb4: {
8282
StorageDead(_3); // scope 0 at $DIR/early_otherwise_branch.rs:17:1: 17:2
8383
return; // scope 0 at $DIR/early_otherwise_branch.rs:17:2: 17:2
84-
+ }
85-
+
84+
}
85+
86+
- bb7: {
87+
- unreachable; // scope 0 at $DIR/early_otherwise_branch.rs:15:14: 15:15
8688
+ bb5: {
8789
+ StorageDead(_12); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
8890
+ switchInt(_8) -> [0_isize: bb3, 1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17

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

Lines changed: 14 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -81,7 +81,7 @@
8181
- StorageDead(_5); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:23: 21:24
8282
+ nop; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:23: 21:24
8383
_11 = discriminant((*(_4.0: &ViewportPercentageLength))); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:14: 21:24
84-
- switchInt(move _11) -> [0_isize: bb1, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb2]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
84+
- switchInt(move _11) -> [0_isize: bb1, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb11]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
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
@@ -217,14 +217,9 @@
217217
- StorageDead(_13); // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:49: 22:50
218218
- StorageDead(_12); // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:49: 22:50
219219
- goto -> bb10; // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:49: 22:50
220-
+ nop; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:5: 27:7
221-
+ discriminant(_0) = 0; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:5: 27:7
222-
+ nop; // scope 0 at $DIR/early_otherwise_branch_68867.rs:27:6: 27:7
223-
+ nop; // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:1: 28:2
224-
+ return; // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:2: 28:2
225-
}
226-
227-
bb7: {
220+
- }
221+
-
222+
- bb7: {
228223
- StorageLive(_17); // scope 0 at $DIR/early_otherwise_branch_68867.rs:23:14: 23:17
229224
- _17 = (((*(_4.0: &ViewportPercentageLength)) as Vh).0: f32); // scope 0 at $DIR/early_otherwise_branch_68867.rs:23:14: 23:17
230225
- StorageLive(_18); // scope 0 at $DIR/early_otherwise_branch_68867.rs:23:24: 23:29
@@ -289,10 +284,18 @@
289284
-
290285
- bb10: {
291286
- ((_0 as Ok).0: ViewportPercentageLength) = move _3; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:5: 27:7
292-
- discriminant(_0) = 0; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:5: 27:7
287+
+ nop; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:5: 27:7
288+
discriminant(_0) = 0; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:5: 27:7
293289
- StorageDead(_3); // scope 0 at $DIR/early_otherwise_branch_68867.rs:27:6: 27:7
294290
- StorageDead(_4); // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:1: 28:2
295-
- return; // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:2: 28:2
291+
+ nop; // scope 0 at $DIR/early_otherwise_branch_68867.rs:27:6: 27:7
292+
+ nop; // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:1: 28:2
293+
return; // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:2: 28:2
294+
}
295+
296+
- bb11: {
297+
- unreachable; // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:2: 28:2
298+
+ bb7: {
296299
+ StorageDead(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
297300
+ 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
298301
}

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

Lines changed: 5 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -67,7 +67,7 @@
6767
StorageDead(_6); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:23: 21:24
6868
StorageDead(_5); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:23: 21:24
6969
_11 = discriminant((*(_4.0: &ViewportPercentageLength))); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:14: 21:24
70-
- switchInt(move _11) -> [0_isize: bb1, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb2]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
70+
- switchInt(move _11) -> [0_isize: bb1, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb11]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
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
@@ -206,8 +206,10 @@
206206
StorageDead(_3); // scope 0 at $DIR/early_otherwise_branch_68867.rs:27:6: 27:7
207207
StorageDead(_4); // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:1: 28:2
208208
return; // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:2: 28:2
209-
+ }
210-
+
209+
}
210+
211+
- bb11: {
212+
- unreachable; // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:2: 28:2
211213
+ bb7: {
212214
+ StorageDead(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
213215
+ 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

‎src/test/mir-opt/uninhabited_fallthrough_elimination.eliminate_fallthrough.UninhabitedEnumBranching.diff

Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,38 @@
1+
- // MIR for `eliminate_fallthrough` before UninhabitedEnumBranching
2+
+ // MIR for `eliminate_fallthrough` after UninhabitedEnumBranching
3+
4+
fn eliminate_fallthrough(_1: S) -> u32 {
5+
debug s => _1; // in scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:21:26: 21:27
6+
let mut _0: u32; // return place in scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:21:35: 21:38
7+
let mut _2: isize; // in scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:23:9: 23:10
8+
9+
bb0: {
10+
_2 = discriminant(_1); // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:22:11: 22:12
11+
- switchInt(move _2) -> [1_isize: bb3, 2_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:22:5: 22:12
12+
+ switchInt(move _2) -> [1_isize: bb3, 2_isize: bb2, otherwise: bb5]; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:22:5: 22:12
13+
}
14+
15+
bb1: {
16+
_0 = const 3_u32; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:25:14: 25:15
17+
goto -> bb4; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:25:14: 25:15
18+
}
19+
20+
bb2: {
21+
_0 = const 1_u32; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:23:14: 23:15
22+
goto -> bb4; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:23:14: 23:15
23+
}
24+
25+
bb3: {
26+
_0 = const 2_u32; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:24:14: 24:15
27+
goto -> bb4; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:24:14: 24:15
28+
}
29+
30+
bb4: {
31+
return; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:27:2: 27:2
32+
+ }
33+
+
34+
+ bb5: {
35+
+ unreachable; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:25:14: 25:15
36+
}
37+
}
38+

‎src/test/mir-opt/uninhabited_fallthrough_elimination.keep_fallthrough.UninhabitedEnumBranching.diff

Lines changed: 34 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,34 @@
1+
- // MIR for `keep_fallthrough` before UninhabitedEnumBranching
2+
+ // MIR for `keep_fallthrough` after UninhabitedEnumBranching
3+
4+
fn keep_fallthrough(_1: S) -> u32 {
5+
debug s => _1; // in scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:12:21: 12:22
6+
let mut _0: u32; // return place in scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:12:30: 12:33
7+
let mut _2: isize; // in scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:14:9: 14:13
8+
9+
bb0: {
10+
_2 = discriminant(_1); // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:13:11: 13:12
11+
- switchInt(move _2) -> [0_isize: bb2, 1_isize: bb3, otherwise: bb1]; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:13:5: 13:12
12+
+ switchInt(move _2) -> [1_isize: bb3, otherwise: bb1]; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:13:5: 13:12
13+
}
14+
15+
bb1: {
16+
_0 = const 3_u32; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:16:14: 16:15
17+
goto -> bb4; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:16:14: 16:15
18+
}
19+
20+
bb2: {
21+
_0 = const 1_u32; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:14:17: 14:18
22+
goto -> bb4; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:14:17: 14:18
23+
}
24+
25+
bb3: {
26+
_0 = const 2_u32; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:15:14: 15:15
27+
goto -> bb4; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:15:14: 15:15
28+
}
29+
30+
bb4: {
31+
return; // scope 0 at $DIR/uninhabited_fallthrough_elimination.rs:18:2: 18:2
32+
}
33+
}
34+

‎src/test/mir-opt/uninhabited_fallthrough_elimination.rs

Lines changed: 32 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,32 @@
1+
enum Empty {}
2+
3+
enum S {
4+
A(Empty),
5+
B,
6+
C,
7+
}
8+
9+
use S::*;
10+
11+
// EMIT_MIR uninhabited_fallthrough_elimination.keep_fallthrough.UninhabitedEnumBranching.diff
12+
fn keep_fallthrough(s: S) -> u32 {
13+
match s {
14+
A(_) => 1,
15+
B => 2,
16+
_ => 3,
17+
}
18+
}
19+
20+
// EMIT_MIR uninhabited_fallthrough_elimination.eliminate_fallthrough.UninhabitedEnumBranching.diff
21+
fn eliminate_fallthrough(s: S) -> u32 {
22+
match s {
23+
C => 1,
24+
B => 2,
25+
_ => 3,
26+
}
27+
}
28+
29+
fn main() {
30+
keep_fallthrough(B);
31+
eliminate_fallthrough(B);
32+
}

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