diff --git a/test/Transforms/SimplifyLibCalls/StrNCmp.ll b/test/Transforms/SimplifyLibCalls/StrNCmp.ll
new file mode 100644
index 00000000000..1b16149393d
--- /dev/null
+++ b/test/Transforms/SimplifyLibCalls/StrNCmp.ll
@@ -0,0 +1,26 @@
+; Test that the StrCmpOptimizer works correctly
+; RUN: llvm-as < %s | opt -simplify-libcalls | llvm-dis | not grep 'call.*strcmp'
+
+declare int %strncmp(sbyte*,sbyte*,int)
+declare int %puts(sbyte*)
+%hello = constant [6 x sbyte] c"hello\00"
+%hell = constant [5 x sbyte] c"hell\00"
+%null = constant [1 x sbyte] c"\00"
+
+implementation   ; Functions:
+
+int %main () {
+  %hello_p = getelementptr [6 x sbyte]* %hello, int 0, int 0
+  %hell_p  = getelementptr [5 x sbyte]* %hell, int 0, int 0
+  %null_p  = getelementptr [1 x sbyte]* %null, int 0, int 0
+  %temp1 = call int %strncmp(sbyte* %hello_p, sbyte* %hello_p,int 5)
+  %temp2 = call int %strncmp(sbyte* %null_p, sbyte* %null_p,int 0)
+  %temp3 = call int %strncmp(sbyte* %hello_p, sbyte* %null_p,int 0)
+  %temp4 = call int %strncmp(sbyte* %null_p, sbyte* %hello_p,int 0)
+  %temp5 = call int %strncmp(sbyte* %hell_p, sbyte* %hello_p,int 4)
+  %rslt1 = add int %temp1, %temp2
+  %rslt2 = add int %rslt1, %temp3
+  %rslt3 = add int %rslt2, %temp4
+  %rslt4 = add int %rslt3, %temp5
+  ret int %rslt4
+}