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-rw-r--r--test/fixedbugs/issue23812.go34
1 files changed, 34 insertions, 0 deletions
diff --git a/test/fixedbugs/issue23812.go b/test/fixedbugs/issue23812.go
new file mode 100644
index 0000000..0a40deb
--- /dev/null
+++ b/test/fixedbugs/issue23812.go
@@ -0,0 +1,34 @@
+// run
+
+// Copyright 2018 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"
+
+func main() {
+ want := int32(0x3edae8)
+ got := foo(1)
+ if want != got {
+ panic(fmt.Sprintf("want %x, got %x", want, got))
+ }
+}
+
+func foo(a int32) int32 {
+ return shr1(int32(shr2(int64(0x14ff6e2207db5d1f), int(a))), 4)
+}
+
+func shr1(n int32, m int) int32 { return n >> uint(m) }
+
+func shr2(n int64, m int) int64 {
+ if m < 0 {
+ m = -m
+ }
+ if m >= 64 {
+ return n
+ }
+
+ return n >> uint(m)
+}