diff options
| -rw-r--r-- | src/test/mir-opt/issues/issue-75439.rs | 21 | ||||
| -rw-r--r-- | src/test/mir-opt/issues/issue_75439.foo.MatchBranchSimplification.diff | 87 |
2 files changed, 108 insertions, 0 deletions
diff --git a/src/test/mir-opt/issues/issue-75439.rs b/src/test/mir-opt/issues/issue-75439.rs new file mode 100644 index 00000000000..44d6bc619d3 --- /dev/null +++ b/src/test/mir-opt/issues/issue-75439.rs @@ -0,0 +1,21 @@ +// EMIT_MIR issue_75439.foo.MatchBranchSimplification.diff + +#![feature(const_fn_transmute)] +#![feature(or_patterns)] + +use std::mem::transmute; + +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 + } +} + +fn main() { + let _ = foo([0; 16]); +} diff --git a/src/test/mir-opt/issues/issue_75439.foo.MatchBranchSimplification.diff b/src/test/mir-opt/issues/issue_75439.foo.MatchBranchSimplification.diff new file mode 100644 index 00000000000..43422b36e1e --- /dev/null +++ b/src/test/mir-opt/issues/issue_75439.foo.MatchBranchSimplification.diff @@ -0,0 +1,87 @@ +- // MIR for `foo` before MatchBranchSimplification ++ // MIR for `foo` after MatchBranchSimplification + + 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 { + } + + 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>)) } + } + + 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 + } + + bb2: { + switchInt(_2[1 of 4]) -> [0_u32: bb3, otherwise: bb4]; // scope 1 at $DIR/issue-75439.rs:12:16: 12:17 + } + + 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 + } + + 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 + } + + 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>)) } + } + + 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 + } + + 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 + } + + 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 + } + + 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 + } + } + |