1; Test that the strcpy library call simplifier works correctly.
2; rdar://6839935
3; RUN: opt < %s -instcombine -S | FileCheck %s
4;
5; This transformation requires the pointer size, as it assumes that size_t is
6; the size of a pointer.
7target 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"
8
9@hello = constant [6 x i8] c"hello\00"
10@a = common global [32 x i8] zeroinitializer, align 1
11@b = common global [32 x i8] zeroinitializer, align 1
12
13declare i8* @strcpy(i8*, i8*)
14
15define void @test_simplify1() {
16; CHECK-LABEL: @test_simplify1(
17
18  %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
19  %src = getelementptr [6 x i8], [6 x i8]* @hello, i32 0, i32 0
20
21  call i8* @strcpy(i8* %dst, i8* %src)
22; CHECK: @llvm.memcpy.p0i8.p0i8.i32
23  ret void
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* @strcpy(i8* %dst, i8* %dst)
32; CHECK: ret i8* getelementptr inbounds ([32 x i8], [32 x i8]* @a, i32 0, i32 0)
33  ret i8* %ret
34}
35
36define i8* @test_no_simplify1() {
37; CHECK-LABEL: @test_no_simplify1(
38
39  %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
40  %src = getelementptr [32 x i8], [32 x i8]* @b, i32 0, i32 0
41
42  %ret = call i8* @strcpy(i8* %dst, i8* %src)
43; CHECK: call i8* @strcpy
44  ret i8* %ret
45}
46