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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
| ; RUN: opt -tbaa -basicaa -licm -S < %s | FileCheck %s
; RUN: opt -aa-pipeline=type-based-aa,basic-aa -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' -S %s | FileCheck %s
; If we can prove a local is thread local, we can insert stores during
; promotion which wouldn't be legal otherwise.
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-S128"
target triple = "x86_64-linux-generic"
@p = external global i8*
declare i8* @malloc(i64)
; Exercise the TLS case
; CHECK-LABEL: @test
define i32* @test(i32 %n) {
entry:
;; ignore the required null check for simplicity
%mem = call dereferenceable(16) noalias i8* @malloc(i64 16)
%addr = bitcast i8* %mem to i32*
br label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
; CHECK-LABEL: for.body.lr.ph:
; CHECK-NEXT: %addr.promoted = load i32, i32* %addr, align 4
br label %for.header
for.header:
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%old = load i32, i32* %addr, align 4
; deliberate impossible to analyze branch
%guard = load atomic i8*, i8** @p monotonic, align 8
%exitcmp = icmp eq i8* %guard, null
br i1 %exitcmp, label %for.body, label %early-exit
early-exit:
; CHECK-LABEL: early-exit:
; CHECK: store i32 %new1.lcssa, i32* %addr, align 4
ret i32* null
for.body:
%new = add i32 %old, 1
store i32 %new, i32* %addr, align 4
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %n
br i1 %cmp, label %for.header, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
; CHECK-LABEL: for.cond.for.end_crit_edge:
; CHECK: store i32 %new.lcssa, i32* %addr, align 4
%split = phi i32* [ %addr, %for.body ]
ret i32* null
}
; Stack allocations can also be thread-local
; CHECK-LABEL: @test2
define i32* @test2(i32 %n) {
entry:
%mem = alloca i8, i32 16
%addr = bitcast i8* %mem to i32*
br label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
; CHECK-LABEL: for.body.lr.ph:
; CHECK-NEXT: %addr.promoted = load i32, i32* %addr, align 4
br label %for.header
for.header:
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%old = load i32, i32* %addr, align 4
; deliberate impossible to analyze branch
%guard = load atomic i8*, i8** @p monotonic, align 8
%exitcmp = icmp eq i8* %guard, null
br i1 %exitcmp, label %for.body, label %early-exit
early-exit:
; CHECK-LABEL: early-exit:
; CHECK: store i32 %new1.lcssa, i32* %addr, align 4
ret i32* null
for.body:
%new = add i32 %old, 1
store i32 %new, i32* %addr, align 4
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %n
br i1 %cmp, label %for.header, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
; CHECK-LABEL: for.cond.for.end_crit_edge:
; CHECK: store i32 %new.lcssa, i32* %addr, align 4
%split = phi i32* [ %addr, %for.body ]
ret i32* null
}
declare i8* @not_malloc(i64)
; Negative test - not TLS
; CHECK-LABEL: @test_neg
define i32* @test_neg(i32 %n) {
entry:
;; ignore the required null check for simplicity
%mem = call dereferenceable(16) noalias i8* @not_malloc(i64 16)
%addr = bitcast i8* %mem to i32*
br label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
br label %for.header
for.header:
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%old = load i32, i32* %addr, align 4
; deliberate impossible to analyze branch
%guard = load volatile i8*, i8** @p
%exitcmp = icmp eq i8* %guard, null
br i1 %exitcmp, label %for.body, label %early-exit
early-exit:
; CHECK-LABEL: early-exit:
; CHECK-NOT: store
ret i32* null
for.body:
; CHECK-LABEL: for.body:
; CHECK: store i32 %new, i32* %addr, align 4
%new = add i32 %old, 1
store i32 %new, i32* %addr, align 4
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %n
br i1 %cmp, label %for.header, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
; CHECK-LABEL: for.cond.for.end_crit_edge:
; CHECK-NOT: store
%split = phi i32* [ %addr, %for.body ]
ret i32* null
}
; Negative test - can't speculate load since branch
; may control alignment
; CHECK-LABEL: @test_neg2
define i32* @test_neg2(i32 %n) {
entry:
;; ignore the required null check for simplicity
%mem = call dereferenceable(16) noalias i8* @malloc(i64 16)
%addr = bitcast i8* %mem to i32*
br label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
br label %for.header
for.header:
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
; deliberate impossible to analyze branch
%guard = load volatile i8*, i8** @p
%exitcmp = icmp eq i8* %guard, null
br i1 %exitcmp, label %for.body, label %early-exit
early-exit:
; CHECK-LABEL: early-exit:
; CHECK-NOT: store
ret i32* null
for.body:
; CHECK-LABEL: for.body:
; CHECK: store i32 %new, i32* %addr, align 4
%old = load i32, i32* %addr, align 4
%new = add i32 %old, 1
store i32 %new, i32* %addr, align 4
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %n
br i1 %cmp, label %for.header, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
; CHECK-LABEL: for.cond.for.end_crit_edge:
; CHECK-NOT: store
%split = phi i32* [ %addr, %for.body ]
ret i32* null
}
|