1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; Test that the strcpy library call simplifier works correctly.
3; rdar://6839935
4; RUN: opt < %s -instcombine -S | FileCheck %s
5;
6; This transformation requires the pointer size, as it assumes that size_t is
7; the size of a pointer.
8target 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"
9
10@hello = constant [6 x i8] c"hello\00"
11@a = common global [32 x i8] zeroinitializer, align 1
12@b = common global [32 x i8] zeroinitializer, align 1
13
14declare i8* @strcpy(i8*, i8*)
15
16define void @test_simplify1() {
17; CHECK-LABEL: @test_simplify1(
18; CHECK-NEXT:    call void @llvm.memcpy.p0i8.p0i8.i32(i8* nonnull align 1 dereferenceable(6) getelementptr inbounds ([32 x i8], [32 x i8]* @a, i32 0, i32 0), i8* nonnull align 1 dereferenceable(6) getelementptr inbounds ([6 x i8], [6 x i8]* @hello, i32 0, i32 0), i32 6, i1 false)
19; CHECK-NEXT:    ret void
20;
21
22  %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
23  %src = getelementptr [6 x i8], [6 x i8]* @hello, i32 0, i32 0
24
25  call i8* @strcpy(i8* %dst, i8* %src)
26  ret void
27}
28
29define i8* @test_simplify2() {
30; CHECK-LABEL: @test_simplify2(
31; CHECK-NEXT:    ret i8* getelementptr inbounds ([32 x i8], [32 x i8]* @a, i32 0, i32 0)
32;
33
34  %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
35
36  %ret = call i8* @strcpy(i8* %dst, i8* %dst)
37  ret i8* %ret
38}
39
40
41define void @test_simplify3(i8* %dst) {
42; CHECK-LABEL: @test_simplify3(
43; CHECK-NEXT:    call void @llvm.memcpy.p0i8.p0i8.i32(i8* nonnull align 1 dereferenceable(80) [[DST:%.*]], i8* nonnull align 1 dereferenceable(6) getelementptr inbounds ([6 x i8], [6 x i8]* @hello, i32 0, i32 0), i32 6, i1 false)
44; CHECK-NEXT:    ret void
45;
46
47  %src = getelementptr [6 x i8], [6 x i8]* @hello, i32 0, i32 0
48
49  call i8* @strcpy(i8* dereferenceable(80) %dst, i8* %src)
50  ret void
51}
52
53define i8* @test_no_simplify1() {
54; CHECK-LABEL: @test_no_simplify1(
55; CHECK-NEXT:    [[RET:%.*]] = call i8* @strcpy(i8* nonnull dereferenceable(1) getelementptr inbounds ([32 x i8], [32 x i8]* @a, i32 0, i32 0), i8* nonnull dereferenceable(1) getelementptr inbounds ([32 x i8], [32 x i8]* @b, i32 0, i32 0))
56; CHECK-NEXT:    ret i8* [[RET]]
57;
58
59  %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
60  %src = getelementptr [32 x i8], [32 x i8]* @b, i32 0, i32 0
61
62  %ret = call i8* @strcpy(i8* %dst, i8* %src)
63  ret i8* %ret
64}
65