1; Test that the strncat libcall simplifier works correctly.
2;
3; RUN: opt < %s -instcombine -S | FileCheck %s
4
5target 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"
6
7@hello = constant [6 x i8] c"hello\00"
8@empty = constant [1 x i8] c"\00"
9@a = common global [32 x i8] zeroinitializer, align 1
10
11declare i8* @strncat(i8*, i8*, i32)
12
13define void @test_simplify1() {
14; CHECK-LABEL: @test_simplify1(
15; CHECK-NOT: call i8* @strncat
16; CHECK: ret void
17
18  %dst = getelementptr [32 x i8]* @a, i32 0, i32 0
19  %src = getelementptr [6 x i8]* @hello, i32 0, i32 0
20  call i8* @strncat(i8* %dst, i8* %src, i32 13)
21  ret void
22}
23
24define void @test_simplify2() {
25; CHECK-LABEL: @test_simplify2(
26; CHECK-NEXT: ret void
27
28  %dst = getelementptr [32 x i8]* @a, i32 0, i32 0
29  %src = getelementptr [1 x i8]* @empty, i32 0, i32 0
30  call i8* @strncat(i8* %dst, i8* %src, i32 13)
31  ret void
32}
33
34define void @test_simplify3() {
35; CHECK-LABEL: @test_simplify3(
36; CHECK-NEXT: ret void
37
38  %dst = getelementptr [32 x i8]* @a, i32 0, i32 0
39  %src = getelementptr [6 x i8]* @hello, i32 0, i32 0
40  call i8* @strncat(i8* %dst, i8* %src, i32 0)
41  ret void
42}
43
44define void @test_nosimplify1() {
45; CHECK-LABEL: @test_nosimplify1(
46; CHECK: call i8* @strncat
47; CHECK: ret void
48
49  %dst = getelementptr [32 x i8]* @a, i32 0, i32 0
50  %src = getelementptr [6 x i8]* @hello, i32 0, i32 0
51  call i8* @strncat(i8* %dst, i8* %src, i32 1)
52  ret void
53}
54