1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
; Test lib call simplification of __stpcpy_chk calls with various values
; for src, dst, and slen.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
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"
@a = common global [60 x i8] zeroinitializer, align 1
@b = common global [60 x i8] zeroinitializer, align 1
@.str = private constant [12 x i8] c"abcdefghijk\00"
; Check cases where slen >= strlen (src).
define void @test_simplify1() {
; CHECK-LABEL: @test_simplify1(
%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
%src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32
call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 60)
ret void
}
define void @test_simplify2() {
; CHECK-LABEL: @test_simplify2(
%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
%src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32
call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 12)
ret void
}
define void @test_simplify3() {
; CHECK-LABEL: @test_simplify3(
%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
%src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32
call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 -1)
ret void
}
; Check cases where there are no string constants.
define void @test_simplify4() {
; CHECK-LABEL: @test_simplify4(
%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
%src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0
; CHECK-NEXT: call i8* @stpcpy
call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 -1)
ret void
}
; Check case where the string length is not constant.
define i8* @test_simplify5() {
; CHECK-LABEL: @test_simplify5(
%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
%src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
; CHECK: @__memcpy_chk
%len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false)
%ret = call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 %len)
; CHECK: ret i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 11)
ret i8* %ret
}
; Check case where the source and destination are the same.
define i8* @test_simplify6() {
; CHECK-LABEL: @test_simplify6(
%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
; CHECK: [[LEN:%[a-z]+]] = call i32 @strlen
; CHECK-NEXT: getelementptr inbounds [60 x i8]* @a, i32 0, i32 [[LEN]]
%len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false)
%ret = call i8* @__stpcpy_chk(i8* %dst, i8* %dst, i32 %len)
ret i8* %ret
}
; Check case where slen < strlen (src).
define void @test_no_simplify1() {
; CHECK-LABEL: @test_no_simplify1(
%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
%src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0
; CHECK-NEXT: call i8* @__stpcpy_chk
call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 8)
ret void
}
declare i8* @__stpcpy_chk(i8*, i8*, i32) nounwind
declare i32 @llvm.objectsize.i32.p0i8(i8*, i1) nounwind readonly
|
