1 ; Test lib call simplification of __strcpy_chk calls with various values
2 ; for src, dst, and slen.
4 ; RUN: opt < %s -instcombine -S | FileCheck %s
6 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"
8 @a = common global [60 x i8] zeroinitializer, align 1
9 @b = common global [60 x i8] zeroinitializer, align 1
10 @.str = private constant [12 x i8] c"abcdefghijk\00"
12 ; Check cases where slen >= strlen (src).
14 define i8* @test_simplify1() {
15 ; CHECK-LABEL: @test_simplify1(
16 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
17 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
19 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* align 1 getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 12, i1 false)
20 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0)
21 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 60)
25 define i8* @test_simplify2() {
26 ; CHECK-LABEL: @test_simplify2(
27 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
28 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
30 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* align 1 getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 12, i1 false)
31 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0)
32 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 12)
36 define i8* @test_simplify3() {
37 ; CHECK-LABEL: @test_simplify3(
38 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
39 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
41 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* align 1 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)
43 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1)
47 ; Check cases where there are no string constants.
49 define i8* @test_simplify4() {
50 ; CHECK-LABEL: @test_simplify4(
51 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
52 %src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0
54 ; CHECK-NEXT: %strcpy = call i8* @strcpy(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))
55 ; CHECK-NEXT: ret i8* %strcpy
56 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1)
60 ; Check case where the string length is not constant.
62 define i8* @test_simplify5() {
63 ; CHECK-LABEL: @test_simplify5(
64 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
65 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
67 ; 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)
68 ; CHECK-NEXT: %1 = 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)
69 ; CHECK-NEXT: ret i8* %1
70 %len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false, i1 false, i1 false)
71 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 %len)
75 ; Check case where the source and destination are the same.
77 define i8* @test_simplify6() {
78 ; CHECK-LABEL: @test_simplify6(
79 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
81 ; 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)
82 ; 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)
83 ; CHECK-NEXT: ret i8* %ret
84 %len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false, i1 false, i1 false)
85 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %dst, i32 %len)
89 ; Check case where slen < strlen (src).
91 define i8* @test_no_simplify1() {
92 ; CHECK-LABEL: @test_no_simplify1(
93 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
94 %src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0
96 ; 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)
97 ; CHECK-NEXT: ret i8* %ret
98 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 8)
102 declare i8* @__strcpy_chk(i8*, i8*, i32) nounwind
103 declare i32 @llvm.objectsize.i32.p0i8(i8*, i1, i1, i1) nounwind readonly