Add a testcase for optimizing the strcpy libcall.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21615 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/SimplifyLibCalls/StrCpy.ll b/test/Transforms/SimplifyLibCalls/StrCpy.ll
new file mode 100644 (file)
index 0000000..1855c0d
--- /dev/null
+++ b/test/Transforms/SimplifyLibCalls/StrCpy.ll
@@ -0,0 +1,24 @@
+; Test that the StrCatOptimizer works correctly
+; RUN: llvm-as < %s | opt -simplify-libcalls | llvm-dis | not grep 'call.*strcat'
+
+declare sbyte* %strcpy(sbyte*,sbyte*)
+declare int %puts(sbyte*)
+%hello = constant [6 x sbyte] c"hello\00"
+%null = constant [1 x sbyte] c"\00"
+%null_hello = constant [7 x sbyte] c"\00hello\00"
+
+implementation   ; Functions:
+
+int %main () {
+  %target = alloca [1024 x sbyte]
+  %arg1 = getelementptr [1024 x sbyte]* %target, int 0, int 0
+  store sbyte 0, sbyte* %arg1
+  %arg2 = getelementptr [6 x sbyte]* %hello, int 0, int 0
+  %rslt1 = call sbyte* %strcpy(sbyte* %arg1, sbyte* %arg2)
+  %arg3 = getelementptr [1 x sbyte]* %null, int 0, int 0
+  %rslt2 = call sbyte* %strcpy(sbyte* %rslt1, sbyte* %arg3)
+  %arg4 = getelementptr [7 x sbyte]* %null_hello, int 0, int 0
+  %rslt3 = call sbyte* %strcpy(sbyte* %rslt2, sbyte* %arg4)
+  call int %puts(sbyte* %rslt3)
+  ret int 0
+}