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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
; Test lib call simplification of __memset_chk calls with various values
; for dstlen and len.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
; rdar://7719085
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
%struct.T = type { [100 x i32], [100 x i32], [1024 x i8] }
@t = common global %struct.T zeroinitializer
; Check cases where dstlen >= len.
define i8* @test_simplify1() {
; CHECK-LABEL: @test_simplify1(
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.T* @t to i8*), i8 0, i64 1824, i32 4, i1 false)
; CHECK-NEXT: ret i8* bitcast (%struct.T* @t to i8*)
%ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 1824)
ret i8* %ret
}
define i8* @test_simplify2() {
; CHECK-LABEL: @test_simplify2(
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.T* @t to i8*), i8 0, i64 1824, i32 4, i1 false)
; CHECK-NEXT: ret i8* bitcast (%struct.T* @t to i8*)
%ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 3648)
ret i8* %ret
}
define i8* @test_simplify3() {
; CHECK-LABEL: @test_simplify3(
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.T* @t to i8*), i8 0, i64 1824, i32 4, i1 false)
; CHECK-NEXT: ret i8* bitcast (%struct.T* @t to i8*)
%ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 -1)
ret i8* %ret
}
; Check cases where dstlen < len.
define i8* @test_no_simplify1() {
; CHECK-LABEL: @test_no_simplify1(
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: %ret = call i8* @__memset_chk(i8* bitcast (%struct.T* @t to i8*), i32 0, i64 1824, i64 400)
; CHECK-NEXT: ret i8* %ret
%ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 400)
ret i8* %ret
}
define i8* @test_no_simplify2() {
; CHECK-LABEL: @test_no_simplify2(
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: %ret = call i8* @__memset_chk(i8* bitcast (%struct.T* @t to i8*), i32 0, i64 1824, i64 0)
; CHECK-NEXT: ret i8* %ret
%ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 0)
ret i8* %ret
}
; Test that RAUW in SimplifyLibCalls for __memset_chk generates valid IR
define i32 @test_rauw(i8* %a, i8* %b, i8** %c) {
; CHECK-LABEL: test_rauw
entry:
%call49 = call i64 @strlen(i8* %a)
%add180 = add i64 %call49, 1
%yo107 = call i64 @llvm.objectsize.i64.p0i8(i8* %b, i1 false, i1 false)
%call50 = call i8* @__memmove_chk(i8* %b, i8* %a, i64 %add180, i64 %yo107)
; CHECK: %strlen = call i64 @strlen(i8* %b)
; CHECK-NEXT: %strchr2 = getelementptr i8, i8* %b, i64 %strlen
%call51i = call i8* @strrchr(i8* %b, i32 0)
%d = load i8*, i8** %c, align 8
%sub182 = ptrtoint i8* %d to i64
%sub183 = ptrtoint i8* %b to i64
%sub184 = sub i64 %sub182, %sub183
%add52.i.i = add nsw i64 %sub184, 1
; CHECK: call void @llvm.memset.p0i8.i64(i8* %strchr2
%call185 = call i8* @__memset_chk(i8* %call51i, i32 0, i64 %add52.i.i, i64 -1)
ret i32 4
}
declare i8* @__memmove_chk(i8*, i8*, i64, i64)
declare i8* @strrchr(i8*, i32)
declare i64 @strlen(i8* nocapture)
declare i64 @llvm.objectsize.i64.p0i8(i8*, i1, i1)
declare i8* @__memset_chk(i8*, i32, i64, i64)
; FIXME: memset(malloc(x), 0, x) -> calloc(1, x)
define float* @pr25892(i64 %size) #0 {
entry:
%call = tail call i8* @malloc(i64 %size) #1
%cmp = icmp eq i8* %call, null
br i1 %cmp, label %cleanup, label %if.end
if.end:
%bc = bitcast i8* %call to float*
%call2 = tail call i64 @llvm.objectsize.i64.p0i8(i8* nonnull %call, i1 false, i1 false)
%call3 = tail call i8* @__memset_chk(i8* nonnull %call, i32 0, i64 %size, i64 %call2) #1
br label %cleanup
cleanup:
%retval.0 = phi float* [ %bc, %if.end ], [ null, %entry ]
ret float* %retval.0
; CHECK-LABEL: @pr25892(
; CHECK: entry:
; CHECK-NEXT: %call = tail call i8* @malloc(i64 %size)
; CHECK-NEXT: %cmp = icmp eq i8* %call, null
; CHECK-NEXT: br i1 %cmp, label %cleanup, label %if.end
; CHECK: if.end:
; CHECK-NEXT: %bc = bitcast i8* %call to float*
; CHECK-NEXT: %call2 = tail call i64 @llvm.objectsize.i64.p0i8(i8* nonnull %call, i1 false, i1 false)
; CHECK-NEXT: %call3 = tail call i8* @__memset_chk(i8* nonnull %call, i32 0, i64 %size, i64 %call2)
; CHECK-NEXT: br label %cleanup
; CHECK: cleanup:
; CHECK-NEXT: %retval.0 = phi float* [ %bc, %if.end ], [ null, %entry ]
; CHECK-NEXT: ret float* %retval.0
}
declare noalias i8* @malloc(i64) #1
attributes #0 = { nounwind ssp uwtable }
attributes #1 = { nounwind }
attributes #2 = { nounwind readnone }
|
