go source for verification 2026-05-22

test/fixedbugs/issue12411.go

@@ -0,0 +1,25 @@
+// run
+
+//go:build !386
+
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Issue 12411. Loss of AX during %.
+
+package main
+
+func main() {
+	x := f(4)
+	if x != 0 {
+		println("BUG: x=", x)
+	}
+}
+
+//go:noinline
+func f(x int) int {
+	// AX was live on entry to one of the % code generations,
+	// and the % code generation smashed it.
+	return ((2 * x) % 3) % (2 % ((x << 2) ^ (x % 3)))
+}