single-access-no-preloop.ll
8.11 KB
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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
; RUN: opt -verify-loop-info -irce -S < %s | FileCheck %s
; RUN: opt -verify-loop-info -passes='require<branch-prob>,loop(irce)' -S < %s | FileCheck %s
define void @single_access_no_preloop_no_offset(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
entry:
%len = load i32, i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%abc = icmp slt i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; CHECK-LABEL: @single_access_no_preloop_no_offset(
; CHECK: loop:
; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
; CHECK: main.exit.selector:
; CHECK-NEXT: %idx.next.lcssa = phi i32 [ %idx.next, %in.bounds ]
; CHECK-NEXT: [[continue:%[^ ]+]] = icmp slt i32 %idx.next.lcssa, %n
; CHECK-NEXT: br i1 [[continue]], label %main.pseudo.exit, label %exit.loopexit
; CHECK: main.pseudo.exit:
; CHECK-NEXT: %idx.copy = phi i32 [ 0, %loop.preheader ], [ %idx.next.lcssa, %main.exit.selector ]
; CHECK-NEXT: %indvar.end = phi i32 [ 0, %loop.preheader ], [ %idx.next.lcssa, %main.exit.selector ]
; CHECK-NEXT: br label %postloop
; CHECK: postloop:
; CHECK-NEXT: br label %loop.postloop
; CHECK: loop.postloop:
; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.next.postloop, %in.bounds.postloop ], [ %idx.copy, %postloop ]
; CHECK-NEXT: %idx.next.postloop = add i32 %idx.postloop, 1
; CHECK-NEXT: %abc.postloop = icmp slt i32 %idx.postloop, %len
; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds
; CHECK: in.bounds.postloop:
; CHECK-NEXT: %addr.postloop = getelementptr i32, i32* %arr, i32 %idx.postloop
; CHECK-NEXT: store i32 0, i32* %addr.postloop
; CHECK-NEXT: %next.postloop = icmp slt i32 %idx.next.postloop, %n
; CHECK-NEXT: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
define void @single_access_no_preloop_with_offset(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
entry:
%len = load i32, i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%idx.for.abc = add i32 %idx, 4
%abc = icmp slt i32 %idx.for.abc, %len
br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx.for.abc
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; CHECK-LABEL: @single_access_no_preloop_with_offset(
; CHECK: loop.preheader:
; CHECK: [[safe_range_end:[^ ]+]] = add nsw i32 %len, -4
; CHECK: [[exit_main_loop_at_hiclamp_cmp:[^ ]+]] = icmp slt i32 %n, [[safe_range_end]]
; CHECK: [[exit_main_loop_at_hiclamp:[^ ]+]] = select i1 [[exit_main_loop_at_hiclamp_cmp]], i32 %n, i32 [[safe_range_end]]
; CHECK: [[exit_main_loop_at_loclamp_cmp:[^ ]+]] = icmp sgt i32 [[exit_main_loop_at_hiclamp]], 0
; CHECK: [[exit_main_loop_at_loclamp:[^ ]+]] = select i1 [[exit_main_loop_at_loclamp_cmp]], i32 [[exit_main_loop_at_hiclamp]], i32 0
; CHECK: [[enter_main_loop:[^ ]+]] = icmp slt i32 0, [[exit_main_loop_at_loclamp]]
; CHECK: br i1 [[enter_main_loop]], label %[[loop_preheader:[^ ,]+]], label %main.pseudo.exit
; CHECK: loop:
; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
; CHECK: in.bounds:
; CHECK: [[continue_main_loop:[^ ]+]] = icmp slt i32 %idx.next, [[exit_main_loop_at_loclamp]]
; CHECK: br i1 [[continue_main_loop]], label %loop, label %main.exit.selector
; CHECK: main.pseudo.exit:
; CHECK: %idx.copy = phi i32 [ 0, %loop.preheader ], [ %idx.next.lcssa, %main.exit.selector ]
; CHECK: br label %postloop
; CHECK: loop.postloop:
; CHECK: %idx.postloop = phi i32 [ %idx.next.postloop, %in.bounds.postloop ], [ %idx.copy, %postloop ]
; CHECK: in.bounds.postloop:
; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n
; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
; Make sure that we do not do IRCE if we know that the safe iteration range of
; the main loop is empty.
define void @single_access_empty_range(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
entry:
%len = load i32, i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%abc = icmp slt i32 %idx, 0
br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; CHECK-LABEL: @single_access_empty_range(
; CHECK-NOT: br i1 false
; CHECK-NOT: preloop
; CHECK-NOT: postloop
define void @single_access_empty_range_2(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
entry:
%len = load i32, i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds2 ]
%idx.next = add i32 %idx, 1
%abc = icmp slt i32 %idx, 60
br i1 %abc, label %in.bounds1, label %out.of.bounds, !prof !1
in.bounds1:
%def = icmp slt i32 %idx, 0
br i1 %def, label %in.bounds2, label %out.of.bounds, !prof !1
in.bounds2:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; CHECK-LABEL: @single_access_empty_range_2(
; CHECK-NOT: br i1 false
; CHECK-NOT: preloop
define void @single_access_no_preloop_no_offset_phi_len(i32 *%arr, i32 *%a_len_ptr, i32 *%b_len_ptr, i32 %n, i1 %unknown_cond) {
entry:
br i1 %unknown_cond, label %if.true, label %if.false
if.true:
%len_a = load i32, i32* %a_len_ptr, !range !0
br label %merge
if.false:
%len_b = load i32, i32* %b_len_ptr, !range !0
br label %merge
merge:
%len = phi i32 [ %len_a, %if.true ], [ %len_b, %if.false ]
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %merge ] , [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%abc = icmp slt i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; CHECK-LABEL: @single_access_no_preloop_no_offset_phi_len(
; CHECK: loop:
; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
; CHECK: main.exit.selector:
; CHECK-NEXT: %idx.next.lcssa = phi i32 [ %idx.next, %in.bounds ]
; CHECK-NEXT: [[continue:%[^ ]+]] = icmp slt i32 %idx.next.lcssa, %n
; CHECK-NEXT: br i1 [[continue]], label %main.pseudo.exit, label %exit.loopexit
; CHECK: main.pseudo.exit:
; CHECK-NEXT: %idx.copy = phi i32 [ 0, %loop.preheader ], [ %idx.next.lcssa, %main.exit.selector ]
; CHECK-NEXT: %indvar.end = phi i32 [ 0, %loop.preheader ], [ %idx.next.lcssa, %main.exit.selector ]
; CHECK-NEXT: br label %postloop
; CHECK: postloop:
; CHECK-NEXT: br label %loop.postloop
; CHECK: loop.postloop:
; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.next.postloop, %in.bounds.postloop ], [ %idx.copy, %postloop ]
; CHECK-NEXT: %idx.next.postloop = add i32 %idx.postloop, 1
; CHECK-NEXT: %abc.postloop = icmp slt i32 %idx.postloop, %len
; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds
; CHECK: in.bounds.postloop:
; CHECK-NEXT: %addr.postloop = getelementptr i32, i32* %arr, i32 %idx.postloop
; CHECK-NEXT: store i32 0, i32* %addr.postloop
; CHECK-NEXT: %next.postloop = icmp slt i32 %idx.next.postloop, %n
; CHECK-NEXT: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
!0 = !{i32 0, i32 2147483647}
!1 = !{!"branch_weights", i32 64, i32 4}