1; Test that the strcat libcall simplifier works correctly per the
2; bug found in PR3661.
3;
4; RUN: opt < %s -instcombine -S | FileCheck %s
5
6target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
7
8@hello = constant [6 x i8] c"hello\00"
9@null = constant [1 x i8] zeroinitializer
10@null_hello = constant [7 x i8] c"\00hello\00"
11
12declare i8* @strcat(i8*, i8*)
13declare i32 @puts(i8*)
14
15define i32 @main() {
16; CHECK-LABEL: @main(
17; CHECK-NOT: call i8* @strcat
18; CHECK: call i32 @puts
19
20  %target = alloca [1024 x i8]
21  %arg1 = getelementptr [1024 x i8], [1024 x i8]* %target, i32 0, i32 0
22  store i8 0, i8* %arg1
23
24  ; rslt1 = strcat(target, "hello\00")
25  %arg2 = getelementptr [6 x i8], [6 x i8]* @hello, i32 0, i32 0
26  %rslt1 = call i8* @strcat(i8* %arg1, i8* %arg2)
27
28  ; rslt2 = strcat(rslt1, "\00")
29  %arg3 = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
30  %rslt2 = call i8* @strcat(i8* %rslt1, i8* %arg3)
31
32  ; rslt3 = strcat(rslt2, "\00hello\00")
33  %arg4 = getelementptr [7 x i8], [7 x i8]* @null_hello, i32 0, i32 0
34  %rslt3 = call i8* @strcat(i8* %rslt2, i8* %arg4)
35
36  call i32 @puts( i8* %rslt3 )
37  ret i32 0
38}
39