diff --git a/test/CodeGen/Mips/2010-11-09-CountLeading.ll b/test/CodeGen/Mips/2010-11-09-CountLeading.ll
new file mode 100644
index 0000000..d592fef
--- /dev/null
+++ b/test/CodeGen/Mips/2010-11-09-CountLeading.ll
@@ -0,0 +1,33 @@
+; RUN: llc -march=mips -mcpu=4ke < %s | FileCheck %s
+
+; CHECK: clz $2, $4
+define i32 @t1(i32 %X) nounwind readnone {
+entry:
+  %tmp1 = tail call i32 @llvm.ctlz.i32(i32 %X)
+  ret i32 %tmp1
+}
+
+declare i32 @llvm.ctlz.i32(i32) nounwind readnone
+
+; CHECK: clz $2, $4
+define i32 @t2(i32 %X) nounwind readnone {
+entry:
+  %tmp1 = tail call i32 @llvm.ctlz.i32(i32 %X)
+  ret i32 %tmp1
+}
+
+; CHECK: clo $2, $4
+define i32 @t3(i32 %X) nounwind readnone {
+entry:
+  %neg = xor i32 %X, -1
+  %tmp1 = tail call i32 @llvm.ctlz.i32(i32 %neg)
+  ret i32 %tmp1
+}
+
+; CHECK: clo $2, $4
+define i32 @t4(i32 %X) nounwind readnone {
+entry:
+  %neg = xor i32 %X, -1
+  %tmp1 = tail call i32 @llvm.ctlz.i32(i32 %neg)
+  ret i32 %tmp1
+}