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Add test for checking if-let or-patterns
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| // EMIT_MIR issue_75439.foo.MatchBranchSimplification.diff | ||
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| #![feature(const_fn_transmute)] | ||
| #![feature(or_patterns)] | ||
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| use std::mem::transmute; | ||
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| pub fn foo(bytes: [u8; 16]) -> Option<[u8; 4]> { | ||
| // big endian `u32`s | ||
| let dwords: [u32; 4] = unsafe { transmute(bytes) }; | ||
| const FF: u32 = 0x0000_ffff_u32.to_be(); | ||
| if let [0, 0, 0 | FF, ip] = dwords { | ||
| Some(unsafe { transmute(ip) }) | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
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| fn main() { | ||
| let _ = foo([0; 16]); | ||
| } |
87 changes: 87 additions & 0 deletions
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src/test/mir-opt/issues/issue_75439.foo.MatchBranchSimplification.diff
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| - // MIR for `foo` before MatchBranchSimplification | ||
| + // MIR for `foo` after MatchBranchSimplification | ||
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| fn foo(_1: [u8; 16]) -> Option<[u8; 4]> { | ||
| debug bytes => _1; // in scope 0 at $DIR/issue-75439.rs:8:12: 8:17 | ||
| let mut _0: std::option::Option<[u8; 4]>; // return place in scope 0 at $DIR/issue-75439.rs:8:32: 8:47 | ||
| let _2: [u32; 4]; // in scope 0 at $DIR/issue-75439.rs:10:9: 10:15 | ||
| let mut _3: [u8; 16]; // in scope 0 at $DIR/issue-75439.rs:10:47: 10:52 | ||
| let mut _5: [u8; 4]; // in scope 0 at $DIR/issue-75439.rs:13:14: 13:38 | ||
| let mut _6: u32; // in scope 0 at $DIR/issue-75439.rs:13:33: 13:35 | ||
| scope 1 { | ||
| debug dwords => _2; // in scope 1 at $DIR/issue-75439.rs:10:9: 10:15 | ||
| let _4: u32; // in scope 1 at $DIR/issue-75439.rs:12:27: 12:29 | ||
| scope 3 { | ||
| debug ip => _4; // in scope 3 at $DIR/issue-75439.rs:12:27: 12:29 | ||
| scope 4 { | ||
| } | ||
| } | ||
| } | ||
| scope 2 { | ||
| } | ||
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| bb0: { | ||
| StorageLive(_2); // scope 0 at $DIR/issue-75439.rs:10:9: 10:15 | ||
| StorageLive(_3); // scope 2 at $DIR/issue-75439.rs:10:47: 10:52 | ||
| _3 = _1; // scope 2 at $DIR/issue-75439.rs:10:47: 10:52 | ||
| _2 = transmute::<[u8; 16], [u32; 4]>(move _3) -> bb1; // scope 2 at $DIR/issue-75439.rs:10:37: 10:53 | ||
| // mir::Constant | ||
| // + span: $DIR/issue-75439.rs:10:37: 10:46 | ||
| // + literal: Const { ty: unsafe extern "rust-intrinsic" fn([u8; 16]) -> [u32; 4] {std::intrinsics::transmute::<[u8; 16], [u32; 4]>}, val: Value(Scalar(<ZST>)) } | ||
| } | ||
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| bb1: { | ||
| StorageDead(_3); // scope 2 at $DIR/issue-75439.rs:10:52: 10:53 | ||
| switchInt(_2[0 of 4]) -> [0_u32: bb2, otherwise: bb4]; // scope 1 at $DIR/issue-75439.rs:12:13: 12:14 | ||
| } | ||
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| bb2: { | ||
| switchInt(_2[1 of 4]) -> [0_u32: bb3, otherwise: bb4]; // scope 1 at $DIR/issue-75439.rs:12:16: 12:17 | ||
| } | ||
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| bb3: { | ||
| switchInt(_2[2 of 4]) -> [0_u32: bb6, 4294901760_u32: bb7, otherwise: bb4]; // scope 1 at $DIR/issue-75439.rs:12:19: 12:20 | ||
| } | ||
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| bb4: { | ||
| discriminant(_0) = 0; // scope 1 at $DIR/issue-75439.rs:15:9: 15:13 | ||
| goto -> bb9; // scope 1 at $DIR/issue-75439.rs:12:5: 16:6 | ||
| } | ||
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| bb5: { | ||
| StorageLive(_5); // scope 3 at $DIR/issue-75439.rs:13:14: 13:38 | ||
| StorageLive(_6); // scope 4 at $DIR/issue-75439.rs:13:33: 13:35 | ||
| _6 = _4; // scope 4 at $DIR/issue-75439.rs:13:33: 13:35 | ||
| _5 = transmute::<u32, [u8; 4]>(move _6) -> bb8; // scope 4 at $DIR/issue-75439.rs:13:23: 13:36 | ||
| // mir::Constant | ||
| // + span: $DIR/issue-75439.rs:13:23: 13:32 | ||
| // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(u32) -> [u8; 4] {std::intrinsics::transmute::<u32, [u8; 4]>}, val: Value(Scalar(<ZST>)) } | ||
| } | ||
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| bb6: { | ||
| StorageLive(_4); // scope 1 at $DIR/issue-75439.rs:12:27: 12:29 | ||
| _4 = _2[3 of 4]; // scope 1 at $DIR/issue-75439.rs:12:27: 12:29 | ||
| goto -> bb5; // scope 1 at $DIR/issue-75439.rs:12:5: 16:6 | ||
| } | ||
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| bb7: { | ||
| StorageLive(_4); // scope 1 at $DIR/issue-75439.rs:12:27: 12:29 | ||
| _4 = _2[3 of 4]; // scope 1 at $DIR/issue-75439.rs:12:27: 12:29 | ||
| goto -> bb5; // scope 1 at $DIR/issue-75439.rs:12:5: 16:6 | ||
| } | ||
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| bb8: { | ||
| StorageDead(_6); // scope 4 at $DIR/issue-75439.rs:13:35: 13:36 | ||
| ((_0 as Some).0: [u8; 4]) = move _5; // scope 3 at $DIR/issue-75439.rs:13:9: 13:39 | ||
| discriminant(_0) = 1; // scope 3 at $DIR/issue-75439.rs:13:9: 13:39 | ||
| StorageDead(_5); // scope 3 at $DIR/issue-75439.rs:13:38: 13:39 | ||
| StorageDead(_4); // scope 1 at $DIR/issue-75439.rs:14:5: 14:6 | ||
| goto -> bb9; // scope 1 at $DIR/issue-75439.rs:12:5: 16:6 | ||
| } | ||
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| bb9: { | ||
| StorageDead(_2); // scope 0 at $DIR/issue-75439.rs:17:1: 17:2 | ||
| return; // scope 0 at $DIR/issue-75439.rs:17:2: 17:2 | ||
| } | ||
| } | ||
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