1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; Test lib call simplification of __strcpy_chk calls with various values
3 ; for src, dst, and slen.
5 ; RUN: opt < %s -instcombine -S | FileCheck %s
7 target 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"
9 @a = common global [60 x i8] zeroinitializer, align 1
10 @b = common global [60 x i8] zeroinitializer, align 1
11 @.str = private constant [12 x i8] c"abcdefghijk\00"
13 ; Check cases where slen >= strlen (src).
15 define i8* @test_simplify1() {
16 ; CHECK-LABEL: @test_simplify1(
17 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* noundef nonnull align 1 dereferenceable(12) getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* noundef nonnull align 1 dereferenceable(12) getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 12, i1 false)
18 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0)
20 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
21 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
23 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 60)
27 define i8* @test_simplify2() {
28 ; CHECK-LABEL: @test_simplify2(
29 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* noundef nonnull align 1 dereferenceable(12) getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* noundef nonnull align 1 dereferenceable(12) getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 12, i1 false)
30 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0)
32 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
33 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
35 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 12)
39 define i8* @test_simplify3() {
40 ; CHECK-LABEL: @test_simplify3(
41 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* noundef nonnull align 1 dereferenceable(12) getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* noundef nonnull align 1 dereferenceable(12) getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 12, i1 false)
42 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0)
44 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
45 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
47 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1)
51 ; Check cases where there are no string constants.
53 define i8* @test_simplify4() {
54 ; CHECK-LABEL: @test_simplify4(
55 ; CHECK-NEXT: [[STRCPY:%.*]] = call i8* @strcpy(i8* noundef nonnull dereferenceable(1) getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* noundef nonnull dereferenceable(1) getelementptr inbounds ([60 x i8], [60 x i8]* @b, i32 0, i32 0))
56 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0)
58 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
59 %src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0
61 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1)
65 ; Check case where the string length is not constant.
67 define i8* @test_simplify5() {
68 ; CHECK-LABEL: @test_simplify5(
69 ; CHECK-NEXT: [[LEN:%.*]] = call i32 @llvm.objectsize.i32.p0i8(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i1 false, i1 false, i1 false)
70 ; CHECK-NEXT: [[TMP1:%.*]] = call i8* @__memcpy_chk(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 12, i32 [[LEN]])
71 ; CHECK-NEXT: ret i8* [[TMP1]]
73 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
74 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
76 %len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false, i1 false, i1 false)
77 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 %len)
81 ; Check case where the source and destination are the same.
83 define i8* @test_simplify6() {
84 ; CHECK-LABEL: @test_simplify6(
85 ; CHECK-NEXT: [[LEN:%.*]] = call i32 @llvm.objectsize.i32.p0i8(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i1 false, i1 false, i1 false)
86 ; CHECK-NEXT: [[RET:%.*]] = call i8* @__strcpy_chk(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i32 [[LEN]])
87 ; CHECK-NEXT: ret i8* [[RET]]
89 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
91 %len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false, i1 false, i1 false)
92 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %dst, i32 %len)
96 ; Check case where slen < strlen (src).
98 define i8* @test_no_simplify1() {
99 ; CHECK-LABEL: @test_no_simplify1(
100 ; CHECK-NEXT: [[RET:%.*]] = call i8* @__strcpy_chk(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* getelementptr inbounds ([60 x i8], [60 x i8]* @b, i32 0, i32 0), i32 8)
101 ; CHECK-NEXT: ret i8* [[RET]]
103 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
104 %src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0
106 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 8)
110 declare i8* @__strcpy_chk(i8*, i8*, i32) nounwind
111 declare i32 @llvm.objectsize.i32.p0i8(i8*, i1, i1, i1) nounwind readonly