1 files changed, 21 insertions, 0 deletions
diff --git a/test/fixedbugs/bug440_32.go b/test/fixedbugs/bug440_32.go
new file mode 100644
index 0000000..2d26fbb
--- /dev/null
+++ b/test/fixedbugs/bug440_32.go
@@ -0,0 +1,21 @@
+// run
+
+// Test for 8g register move bug.  The optimizer gets confused
+// about 16- vs 32-bit moves during splitContractIndex.
+
+// Issue 3910.
+
+package main
+
+func main() {
+	const c = 0x12345678
+	index, n, offset := splitContractIndex(c)
+	if index != int((c&0xffff)>>5) || n != int(c&(1<<5-1)) || offset != (c>>16)&(1<<14-1) {
+		println("BUG", index, n, offset)
+	}
+}
+
+func splitContractIndex(ce uint32) (index, n, offset int) {
+	h := uint16(ce)
+	return int(h >> 5), int(h & (1<<5 - 1)), int(ce>>16) & (1<<14 - 1)
+}