[COMMITTED] gccrs: testsuite: add loop condition execution test

[Arthur Cohen]

From: liushuyu <liushuyu...@gmail.com>

gcc/testsuite/ChangeLog:

        * rust/execute/torture/loop-condition-eval.rs: New test.

Signed-off-by: Zixing Liu <liushuyu...@gmail.com>

Tested on x86_64-pc-linux-gnu, committed on master.

---
 .../execute/torture/loop-condition-eval.rs    | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 gcc/testsuite/rust/execute/torture/loop-condition-eval.rs

diff --git a/gcc/testsuite/rust/execute/torture/loop-condition-eval.rs 
b/gcc/testsuite/rust/execute/torture/loop-condition-eval.rs
new file mode 100644
index 00000000000..008965917ab
--- /dev/null
+++ b/gcc/testsuite/rust/execute/torture/loop-condition-eval.rs
@@ -0,0 +1,21 @@
+// { dg-output "1\n" }
+pub fn test() -> u64 {
+    let mut n = 113383; // #20 in https://oeis.org/A006884
+    while n != 1 {
+        n = if n % 2 == 0 { n / 2 } else { 3 * n + 1 };
+    }
+    n
+}
+
+pub fn test_1() -> u64 {
+    test()
+}
+
+extern "C" {
+    fn printf(fmt: *const i8, ...);
+}
+
+fn main() -> i32 {
+    unsafe { printf("%lu\n" as *const str as *const i8, test_1()) }
+    0
+}
-- 
2.39.1