1 files changed, 56 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyLibCalls/StrLen.ll b/test/Transforms/SimplifyLibCalls/StrLen.ll
new file mode 100644
index 0000000000000..521a2242c9bf6
--- /dev/null
+++ b/test/Transforms/SimplifyLibCalls/StrLen.ll
@@ -0,0 +1,56 @@
+; Test that the StrCatOptimizer works correctly
+; RUN: llvm-as < %s | opt -simplify-libcalls | llvm-dis | \
+; RUN:    not grep {call.*strlen}
+
+target datalayout = "e-p:32:32"
+@hello = constant [6 x i8] c"hello\00"		; <[6 x i8]*> [#uses=3]
+@null = constant [1 x i8] zeroinitializer		; <[1 x i8]*> [#uses=3]
+@null_hello = constant [7 x i8] c"\00hello\00"		; <[7 x i8]*> [#uses=1]
+
+declare i32 @strlen(i8*)
+
+define i32 @test1() {
+	%hello_p = getelementptr [6 x i8]* @hello, i32 0, i32 0		; <i8*> [#uses=1]
+	%hello_l = call i32 @strlen( i8* %hello_p )		; <i32> [#uses=1]
+	ret i32 %hello_l
+}
+
+define i32 @test2() {
+	%null_p = getelementptr [1 x i8]* @null, i32 0, i32 0		; <i8*> [#uses=1]
+	%null_l = call i32 @strlen( i8* %null_p )		; <i32> [#uses=1]
+	ret i32 %null_l
+}
+
+define i32 @test3() {
+	%null_hello_p = getelementptr [7 x i8]* @null_hello, i32 0, i32 0		; <i8*> [#uses=1]
+	%null_hello_l = call i32 @strlen( i8* %null_hello_p )		; <i32> [#uses=1]
+	ret i32 %null_hello_l
+}
+
+define i1 @test4() {
+	%hello_p = getelementptr [6 x i8]* @hello, i32 0, i32 0		; <i8*> [#uses=1]
+	%hello_l = call i32 @strlen( i8* %hello_p )		; <i32> [#uses=1]
+	%eq_hello = icmp eq i32 %hello_l, 0		; <i1> [#uses=1]
+	ret i1 %eq_hello
+}
+
+define i1 @test5() {
+	%null_p = getelementptr [1 x i8]* @null, i32 0, i32 0		; <i8*> [#uses=1]
+	%null_l = call i32 @strlen( i8* %null_p )		; <i32> [#uses=1]
+	%eq_null = icmp eq i32 %null_l, 0		; <i1> [#uses=1]
+	ret i1 %eq_null
+}
+
+define i1 @test6() {
+	%hello_p = getelementptr [6 x i8]* @hello, i32 0, i32 0		; <i8*> [#uses=1]
+	%hello_l = call i32 @strlen( i8* %hello_p )		; <i32> [#uses=1]
+	%ne_hello = icmp ne i32 %hello_l, 0		; <i1> [#uses=1]
+	ret i1 %ne_hello
+}
+
+define i1 @test7() {
+	%null_p = getelementptr [1 x i8]* @null, i32 0, i32 0		; <i8*> [#uses=1]
+	%null_l = call i32 @strlen( i8* %null_p )		; <i32> [#uses=1]
+	%ne_null = icmp ne i32 %null_l, 0		; <i1> [#uses=1]
+	ret i1 %ne_null
+}