1 files changed, 28 insertions, 0 deletions
diff --git a/test/fixedbugs/issue45242.go b/test/fixedbugs/issue45242.go
new file mode 100644
index 0000000..b997221
--- /dev/null
+++ b/test/fixedbugs/issue45242.go
@@ -0,0 +1,28 @@
+// run
+
+// Copyright 2021 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.
+
+package main
+
+import "fmt"
+
+//go:noinline
+func repro(b []byte, bit int32) {
+	_ = b[3]
+	v := uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24 | 1<<(bit&31)
+	b[0] = byte(v)
+	b[1] = byte(v >> 8)
+	b[2] = byte(v >> 16)
+	b[3] = byte(v >> 24)
+}
+
+func main() {
+	var b [8]byte
+	repro(b[:], 32)
+	want := [8]byte{1, 0, 0, 0, 0, 0, 0, 0}
+	if b != want {
+		panic(fmt.Sprintf("got %v, want %v\n", b, want))
+	}
+}