diff --git a/test/Transforms/SimplifyLibCalls/ToAscii.ll b/test/Transforms/SimplifyLibCalls/ToAscii.ll
new file mode 100644
index 00000000000..cb7d06c701f
--- /dev/null
+++ b/test/Transforms/SimplifyLibCalls/ToAscii.ll
@@ -0,0 +1,21 @@
+; Test that the ToAsciiOptimizer works correctly
+; RUN: llvm-as < %s | opt -simplify-libcalls | llvm-dis | not grep 'call.*toascii'
+
+declare int %toascii(int)
+
+implementation   ; Functions:
+
+int %main () {
+  %val1 = call int %toascii(int 1)
+  %val2 = call int %toascii(int 0)
+  %val3 = call int %toascii(int 127)
+  %val4 = call int %toascii(int 128)
+  %val5 = call int %toascii(int 255)
+  %val6 = call int %toascii(int 256)
+  %rslt1 = add int %val1, %val2
+  %rslt2 = add int %val3, %val4
+  %rslt3 = add int %val5, %val6
+  %rslt4 = add int %rslt1, %rslt2
+  %rslt5 = add int %rslt4, %rslt3
+  ret int %rslt5
+}