From: liushuyu <liushuyu011@gmail.com>
Date: Wed, 7 Sep 2022 04:41:17 +0000 (-0600)
Subject: gccrs: testsuite: add loop condition execution test
X-Git-Tag: basepoints/gcc-14~1649
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0d5adf09356641070079eadef09717ece164b6b9;p=thirdparty%2Fgcc.git

gccrs: testsuite: add loop condition execution test

gcc/testsuite/ChangeLog:

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

Signed-off-by: Zixing Liu <liushuyu011@gmail.com>
---

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 000000000000..008965917ab0
--- /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
+}