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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=mergeicmps -verify-dom-info -mtriple=x86_64-unknown-unknown -S | FileCheck %s --check-prefix=X86
%S = type { i32, i32, i32, i32 }
declare void @foo(...)
; We can split %entry and create a memcmp(16 bytes).
define zeroext i1 @opeq1(
; X86-LABEL: @opeq1(
; X86-NEXT: "entry+land.rhs.i+land.rhs.i.2+land.rhs.i.3":
; X86-NEXT: call void (...) @foo() #[[ATTR2:[0-9]+]]
; X86-NEXT: [[MEMCMP:%.*]] = call i32 @memcmp(ptr [[A:%.*]], ptr [[B:%.*]], i64 16)
; X86-NEXT: [[TMP2:%.*]] = icmp eq i32 [[MEMCMP]], 0
; X86-NEXT: br label [[OPEQ1_EXIT:%.*]]
; X86: opeq1.exit:
; X86-NEXT: ret i1 [[TMP2]]
;
; Make sure this call is moved to the beginning of the entry block.
ptr nocapture readonly dereferenceable(16) %a,
ptr nocapture readonly dereferenceable(16) %b) local_unnamed_addr nofree nosync {
entry:
%0 = load i32, ptr %a, align 4
%1 = load i32, ptr %b, align 4
; Does other work.
call void (...) @foo() inaccessiblememonly
%cmp.i = icmp eq i32 %0, %1
br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit
land.rhs.i:
%second.i = getelementptr inbounds %S, ptr %a, i64 0, i32 1
%2 = load i32, ptr %second.i, align 4
%second2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 1
%3 = load i32, ptr %second2.i, align 4
%cmp2.i = icmp eq i32 %2, %3
br i1 %cmp2.i, label %land.rhs.i.2, label %opeq1.exit
land.rhs.i.2:
%third.i = getelementptr inbounds %S, ptr %a, i64 0, i32 2
%4 = load i32, ptr %third.i, align 4
%third2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 2
%5 = load i32, ptr %third2.i, align 4
%cmp3.i = icmp eq i32 %4, %5
br i1 %cmp3.i, label %land.rhs.i.3, label %opeq1.exit
land.rhs.i.3:
%fourth.i = getelementptr inbounds %S, ptr %a, i64 0, i32 3
%6 = load i32, ptr %fourth.i, align 4
%fourth2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 3
%7 = load i32, ptr %fourth2.i, align 4
%cmp4.i = icmp eq i32 %6, %7
br label %opeq1.exit
opeq1.exit:
%8 = phi i1 [ false, %entry ], [ false, %land.rhs.i] , [ false, %land.rhs.i.2 ], [ %cmp4.i, %land.rhs.i.3 ]
ret i1 %8
}
; We will not be able to merge anything, make sure the call is not moved out.
define zeroext i1 @opeq1_discontiguous(
; X86-LABEL: @opeq1_discontiguous(
; X86-NEXT: entry:
; X86-NEXT: [[FIRST_I:%.*]] = getelementptr inbounds [[S:%.*]], ptr [[A:%.*]], i64 0, i32 1
; X86-NEXT: [[TMP0:%.*]] = load i32, ptr [[FIRST_I]], align 4
; X86-NEXT: [[TMP1:%.*]] = load i32, ptr [[B:%.*]], align 4
; X86-NEXT: call void (...) @foo() #[[ATTR2]]
; X86-NEXT: [[CMP_I:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
; X86-NEXT: br i1 [[CMP_I]], label [[LAND_RHS_I:%.*]], label [[OPEQ1_EXIT:%.*]]
; X86: land.rhs.i:
; X86-NEXT: [[SECOND_I:%.*]] = getelementptr inbounds [[S]], ptr [[A]], i64 0, i32 2
; X86-NEXT: [[TMP2:%.*]] = load i32, ptr [[SECOND_I]], align 4
; X86-NEXT: [[SECOND2_I:%.*]] = getelementptr inbounds [[S]], ptr [[B]], i64 0, i32 1
; X86-NEXT: [[TMP3:%.*]] = load i32, ptr [[SECOND2_I]], align 4
; X86-NEXT: [[CMP2_I:%.*]] = icmp eq i32 [[TMP2]], [[TMP3]]
; X86-NEXT: br i1 [[CMP2_I]], label [[LAND_RHS_I_2:%.*]], label [[OPEQ1_EXIT]]
; X86: land.rhs.i.2:
; X86-NEXT: [[THIRD_I:%.*]] = getelementptr inbounds [[S]], ptr [[A]], i64 0, i32 2
; X86-NEXT: [[TMP4:%.*]] = load i32, ptr [[THIRD_I]], align 4
; X86-NEXT: [[THIRD2_I:%.*]] = getelementptr inbounds [[S]], ptr [[B]], i64 0, i32 3
; X86-NEXT: [[TMP5:%.*]] = load i32, ptr [[THIRD2_I]], align 4
; X86-NEXT: [[CMP3_I:%.*]] = icmp eq i32 [[TMP4]], [[TMP5]]
; X86-NEXT: br i1 [[CMP3_I]], label [[LAND_RHS_I_3:%.*]], label [[OPEQ1_EXIT]]
; X86: land.rhs.i.3:
; X86-NEXT: [[FOURTH_I:%.*]] = getelementptr inbounds [[S]], ptr [[A]], i64 0, i32 1
; X86-NEXT: [[TMP6:%.*]] = load i32, ptr [[FOURTH_I]], align 4
; X86-NEXT: [[FOURTH2_I:%.*]] = getelementptr inbounds [[S]], ptr [[B]], i64 0, i32 3
; X86-NEXT: [[TMP7:%.*]] = load i32, ptr [[FOURTH2_I]], align 4
; X86-NEXT: [[CMP4_I:%.*]] = icmp eq i32 [[TMP6]], [[TMP7]]
; X86-NEXT: br label [[OPEQ1_EXIT]]
; X86: opeq1.exit:
; X86-NEXT: [[TMP8:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ false, [[LAND_RHS_I]] ], [ false, [[LAND_RHS_I_2]] ], [ [[CMP4_I]], [[LAND_RHS_I_3]] ]
; X86-NEXT: ret i1 [[TMP8]]
;
; Make sure this call is moved in the entry block.
ptr nocapture readonly dereferenceable(16) %a,
ptr nocapture readonly dereferenceable(16) %b) local_unnamed_addr #0 {
entry:
%first.i = getelementptr inbounds %S, ptr %a, i64 0, i32 1
%0 = load i32, ptr %first.i, align 4
%1 = load i32, ptr %b, align 4
; Does other work.
call void (...) @foo() inaccessiblememonly
%cmp.i = icmp eq i32 %0, %1
br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit
land.rhs.i:
%second.i = getelementptr inbounds %S, ptr %a, i64 0, i32 2
%2 = load i32, ptr %second.i, align 4
%second2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 1
%3 = load i32, ptr %second2.i, align 4
%cmp2.i = icmp eq i32 %2, %3
br i1 %cmp2.i, label %land.rhs.i.2, label %opeq1.exit
land.rhs.i.2:
%third.i = getelementptr inbounds %S, ptr %a, i64 0, i32 2
%4 = load i32, ptr %third.i, align 4
%third2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 3
%5 = load i32, ptr %third2.i, align 4
%cmp3.i = icmp eq i32 %4, %5
br i1 %cmp3.i, label %land.rhs.i.3, label %opeq1.exit
land.rhs.i.3:
%fourth.i = getelementptr inbounds %S, ptr %a, i64 0, i32 1
%6 = load i32, ptr %fourth.i, align 4
%fourth2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 3
%7 = load i32, ptr %fourth2.i, align 4
%cmp4.i = icmp eq i32 %6, %7
br label %opeq1.exit
opeq1.exit:
%8 = phi i1 [ false, %entry ], [ false, %land.rhs.i] , [ false, %land.rhs.i.2 ], [ %cmp4.i, %land.rhs.i.3 ]
ret i1 %8
}
; The call happens before the loads, so it cannot clobber them.
define zeroext i1 @opeq1_call_before_loads(
; X86-LABEL: @opeq1_call_before_loads(
; X86-NEXT: "entry+land.rhs.i+land.rhs.i.2+land.rhs.i.3":
; X86-NEXT: call void (...) @foo()
; X86-NEXT: [[MEMCMP:%.*]] = call i32 @memcmp(ptr [[A:%.*]], ptr [[B:%.*]], i64 16)
; X86-NEXT: [[TMP2:%.*]] = icmp eq i32 [[MEMCMP]], 0
; X86-NEXT: br label [[OPEQ1_EXIT:%.*]]
; X86: opeq1.exit:
; X86-NEXT: ret i1 [[TMP2]]
;
; Make sure this call is moved to the beginning of the entry block.
ptr nocapture readonly dereferenceable(16) %a,
ptr nocapture readonly dereferenceable(16) %b) local_unnamed_addr nofree nosync {
entry:
call void (...) @foo()
%0 = load i32, ptr %a, align 4
%1 = load i32, ptr %b, align 4
%cmp.i = icmp eq i32 %0, %1
br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit
land.rhs.i:
%second.i = getelementptr inbounds %S, ptr %a, i64 0, i32 1
%2 = load i32, ptr %second.i, align 4
%second2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 1
%3 = load i32, ptr %second2.i, align 4
%cmp2.i = icmp eq i32 %2, %3
br i1 %cmp2.i, label %land.rhs.i.2, label %opeq1.exit
land.rhs.i.2:
%third.i = getelementptr inbounds %S, ptr %a, i64 0, i32 2
%4 = load i32, ptr %third.i, align 4
%third2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 2
%5 = load i32, ptr %third2.i, align 4
%cmp3.i = icmp eq i32 %4, %5
br i1 %cmp3.i, label %land.rhs.i.3, label %opeq1.exit
land.rhs.i.3:
%fourth.i = getelementptr inbounds %S, ptr %a, i64 0, i32 3
%6 = load i32, ptr %fourth.i, align 4
%fourth2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 3
%7 = load i32, ptr %fourth2.i, align 4
%cmp4.i = icmp eq i32 %6, %7
br label %opeq1.exit
opeq1.exit:
%8 = phi i1 [ false, %entry ], [ false, %land.rhs.i] , [ false, %land.rhs.i.2 ], [ %cmp4.i, %land.rhs.i.3 ]
ret i1 %8
}
; Call happens after the loads, and may clobber them.
define zeroext i1 @opeq1_call_after_loads(
; X86-LABEL: @opeq1_call_after_loads(
; X86-NEXT: entry:
; X86-NEXT: [[TMP0:%.*]] = load i32, ptr [[A:%.*]], align 4
; X86-NEXT: [[TMP1:%.*]] = load i32, ptr [[B:%.*]], align 4
; X86-NEXT: call void (...) @foo()
; X86-NEXT: [[CMP_I:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
; X86-NEXT: br i1 [[CMP_I]], label %"land.rhs.i+land.rhs.i.2+land.rhs.i.3", label [[OPEQ1_EXIT:%.*]]
; X86: "land.rhs.i+land.rhs.i.2+land.rhs.i.3":
; X86-NEXT: [[TMP2:%.*]] = getelementptr inbounds [[S]], ptr [[A]], i64 0, i32 1
; X86-NEXT: [[TMP3:%.*]] = getelementptr inbounds [[S]], ptr [[B]], i64 0, i32 1
; X86-NEXT: [[MEMCMP:%.*]] = call i32 @memcmp(ptr [[TMP2]], ptr [[TMP3]], i64 12)
; X86-NEXT: [[TMP4:%.*]] = icmp eq i32 [[MEMCMP]], 0
; X86-NEXT: br label [[OPEQ1_EXIT]]
; X86: opeq1.exit:
; X86-NEXT: [[TMP5:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[TMP4]], %"land.rhs.i+land.rhs.i.2+land.rhs.i.3" ]
; X86-NEXT: ret i1 [[TMP5]]
;
; Make sure this call is moved to the beginning of the entry block.
ptr nocapture readonly dereferenceable(16) %a,
ptr nocapture readonly dereferenceable(16) %b) local_unnamed_addr nofree nosync {
entry:
%0 = load i32, ptr %a, align 4
%1 = load i32, ptr %b, align 4
call void (...) @foo()
%cmp.i = icmp eq i32 %0, %1
br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit
land.rhs.i:
%second.i = getelementptr inbounds %S, ptr %a, i64 0, i32 1
%2 = load i32, ptr %second.i, align 4
%second2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 1
%3 = load i32, ptr %second2.i, align 4
%cmp2.i = icmp eq i32 %2, %3
br i1 %cmp2.i, label %land.rhs.i.2, label %opeq1.exit
land.rhs.i.2:
%third.i = getelementptr inbounds %S, ptr %a, i64 0, i32 2
%4 = load i32, ptr %third.i, align 4
%third2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 2
%5 = load i32, ptr %third2.i, align 4
%cmp3.i = icmp eq i32 %4, %5
br i1 %cmp3.i, label %land.rhs.i.3, label %opeq1.exit
land.rhs.i.3:
%fourth.i = getelementptr inbounds %S, ptr %a, i64 0, i32 3
%6 = load i32, ptr %fourth.i, align 4
%fourth2.i = getelementptr inbounds %S, ptr %b, i64 0, i32 3
%7 = load i32, ptr %fourth2.i, align 4
%cmp4.i = icmp eq i32 %6, %7
br label %opeq1.exit
opeq1.exit:
%8 = phi i1 [ false, %entry ], [ false, %land.rhs.i] , [ false, %land.rhs.i.2 ], [ %cmp4.i, %land.rhs.i.3 ]
ret i1 %8
}
|
