From 64d98f8ee037282c35007b64c2649055c56af1db Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:19:03 +0200
Subject: Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tests/codegen/non-terminate/infinite-loop-1.rs     | 17 +++++++++++++
 tests/codegen/non-terminate/infinite-loop-2.rs     | 19 +++++++++++++++
 tests/codegen/non-terminate/infinite-recursion.rs  | 14 +++++++++++
 .../non-terminate/nonempty-infinite-loop.rs        | 28 ++++++++++++++++++++++
 4 files changed, 78 insertions(+)
 create mode 100644 tests/codegen/non-terminate/infinite-loop-1.rs
 create mode 100644 tests/codegen/non-terminate/infinite-loop-2.rs
 create mode 100644 tests/codegen/non-terminate/infinite-recursion.rs
 create mode 100644 tests/codegen/non-terminate/nonempty-infinite-loop.rs

(limited to 'tests/codegen/non-terminate')

diff --git a/tests/codegen/non-terminate/infinite-loop-1.rs b/tests/codegen/non-terminate/infinite-loop-1.rs
new file mode 100644
index 000000000..fa9c66b47
--- /dev/null
+++ b/tests/codegen/non-terminate/infinite-loop-1.rs
@@ -0,0 +1,17 @@
+// compile-flags: -C opt-level=3
+
+#![crate_type = "lib"]
+
+fn infinite_loop() -> u8 {
+    loop {}
+}
+
+// CHECK-LABEL: @test
+#[no_mangle]
+fn test() -> u8 {
+    // CHECK-NOT: unreachable
+    // CHECK: br label %{{.+}}
+    // CHECK-NOT: unreachable
+    let x = infinite_loop();
+    x
+}
diff --git a/tests/codegen/non-terminate/infinite-loop-2.rs b/tests/codegen/non-terminate/infinite-loop-2.rs
new file mode 100644
index 000000000..81d62ab33
--- /dev/null
+++ b/tests/codegen/non-terminate/infinite-loop-2.rs
@@ -0,0 +1,19 @@
+// compile-flags: -C opt-level=3
+
+#![crate_type = "lib"]
+
+fn infinite_loop() -> u8 {
+    let i = 2;
+    while i > 1 {}
+    1
+}
+
+// CHECK-LABEL: @test
+#[no_mangle]
+fn test() -> u8 {
+    // CHECK-NOT: unreachable
+    // CHECK: br label %{{.+}}
+    // CHECK-NOT: unreachable
+    let x = infinite_loop();
+    x
+}
diff --git a/tests/codegen/non-terminate/infinite-recursion.rs b/tests/codegen/non-terminate/infinite-recursion.rs
new file mode 100644
index 000000000..6d1f2d4bf
--- /dev/null
+++ b/tests/codegen/non-terminate/infinite-recursion.rs
@@ -0,0 +1,14 @@
+// compile-flags: -C opt-level=3
+
+#![crate_type = "lib"]
+
+#![allow(unconditional_recursion)]
+
+// CHECK-LABEL: @infinite_recursion
+#[no_mangle]
+fn infinite_recursion() -> u8 {
+    // CHECK-NOT: ret i8 undef
+    // CHECK: br label %{{.+}}
+    // CHECK-NOT: ret i8 undef
+    infinite_recursion()
+}
diff --git a/tests/codegen/non-terminate/nonempty-infinite-loop.rs b/tests/codegen/non-terminate/nonempty-infinite-loop.rs
new file mode 100644
index 000000000..5e25e04fc
--- /dev/null
+++ b/tests/codegen/non-terminate/nonempty-infinite-loop.rs
@@ -0,0 +1,28 @@
+// compile-flags: -C opt-level=3
+
+#![crate_type = "lib"]
+
+// Verify that we don't miscompile this even if rustc didn't apply the trivial loop detection to
+// insert the sideeffect intrinsic.
+
+fn infinite_loop() -> u8 {
+    let mut x = 0;
+    // CHECK-NOT: sideeffect
+    loop {
+        if x == 42 {
+            x = 0;
+        } else {
+            x = 42;
+        }
+    }
+}
+
+// CHECK-LABEL: @test
+#[no_mangle]
+fn test() -> u8 {
+    // CHECK-NOT: unreachable
+    // CHECK: br label %{{.+}}
+    // CHECK-NOT: unreachable
+    let x = infinite_loop();
+    x
+}
-- 
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