Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/mir-opt/issues/issue_75439.rs b/tests/mir-opt/issues/issue_75439.rs
new file mode 100644
index 000000000..4c749a150
--- /dev/null
+++ b/tests/mir-opt/issues/issue_75439.rs
@@ -0,0 +1,19 @@
+// EMIT_MIR issue_75439.foo.MatchBranchSimplification.diff
+// ignore-endian-big
+
+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]);
+}