1; Test that the stpcpy library call simplifier works correctly.
2; RUN: opt < %s -instcombine -S | FileCheck %s
3;
4; This transformation requires the pointer size, as it assumes that size_t is
5; the size of a pointer.
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-n8:16:32"
7
8@hello = constant [6 x i8] c"hello\00"
9@a = common global [32 x i8] zeroinitializer, align 1
10@b = common global [32 x i8] zeroinitializer, align 1
11
12declare i8* @stpcpy(i8*, i8*)
13
14define i8* @test_simplify1() {
15; CHECK-LABEL: @test_simplify1(
16
17  %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
18  %src = getelementptr [6 x i8], [6 x i8]* @hello, i32 0, i32 0
19
20  %ret = call i8* @stpcpy(i8* %dst, i8* %src)
21; CHECK: @llvm.memcpy.p0i8.p0i8.i32
22; CHECK-NEXT: getelementptr inbounds ([32 x i8], [32 x i8]* @a, i32 0, i32 5)
23  ret i8* %ret
24}
25
26define i8* @test_simplify2() {
27; CHECK-LABEL: @test_simplify2(
28
29  %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
30
31  %ret = call i8* @stpcpy(i8* %dst, i8* %dst)
32; CHECK: [[LEN:%[a-z]+]] = call i32 @strlen
33; CHECK-NEXT: getelementptr inbounds [32 x i8], [32 x i8]* @a, i32 0, i32 [[LEN]]
34  ret i8* %ret
35}
36
37define i8* @test_no_simplify1() {
38; CHECK-LABEL: @test_no_simplify1(
39
40  %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
41  %src = getelementptr [32 x i8], [32 x i8]* @b, i32 0, i32 0
42
43  %ret = call i8* @stpcpy(i8* %dst, i8* %src)
44; CHECK: call i8* @stpcpy
45  ret i8* %ret
46}
47