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
|
; RUN: llc < %s -march=x86-64 | FileCheck %s
%struct.obj = type { i64 }
; CHECK: _Z7releaseP3obj
define void @_Z7releaseP3obj(%struct.obj* nocapture %o) nounwind uwtable ssp {
entry:
; CHECK: decq (%{{rdi|rcx}})
; CHECK-NEXT: je
%refcnt = getelementptr inbounds %struct.obj, %struct.obj* %o, i64 0, i32 0
%0 = load i64, i64* %refcnt, align 8
%dec = add i64 %0, -1
store i64 %dec, i64* %refcnt, align 8
%tobool = icmp eq i64 %dec, 0
br i1 %tobool, label %if.end, label %return
if.end: ; preds = %entry
%1 = bitcast %struct.obj* %o to i8*
tail call void @free(i8* %1)
br label %return
return: ; preds = %entry, %if.end
ret void
}
@c = common global i64 0, align 8
@a = common global i32 0, align 4
@.str = private unnamed_addr constant [5 x i8] c"%ld\0A\00", align 1
@b = common global i32 0, align 4
; CHECK: test
define i32 @test() nounwind uwtable ssp {
entry:
; CHECK: decq
; CHECK-NOT: decq
%0 = load i64, i64* @c, align 8
%dec.i = add nsw i64 %0, -1
store i64 %dec.i, i64* @c, align 8
%tobool.i = icmp ne i64 %dec.i, 0
%lor.ext.i = zext i1 %tobool.i to i32
store i32 %lor.ext.i, i32* @a, align 4
%call = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i64 %dec.i) nounwind
ret i32 0
}
; CHECK: test2
define i32 @test2() nounwind uwtable ssp {
entry:
; CHECK-NOT: decq ({{.*}})
%0 = load i64, i64* @c, align 8
%dec.i = add nsw i64 %0, -1
store i64 %dec.i, i64* @c, align 8
%tobool.i = icmp ne i64 %0, 0
%lor.ext.i = zext i1 %tobool.i to i32
store i32 %lor.ext.i, i32* @a, align 4
%call = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i64 %dec.i) nounwind
ret i32 0
}
declare i32 @printf(i8* nocapture, ...) nounwind
declare void @free(i8* nocapture) nounwind
%struct.obj2 = type { i64, i32, i16, i8 }
declare void @other(%struct.obj2* ) nounwind;
; CHECK: example_dec
define void @example_dec(%struct.obj2* %o) nounwind uwtable ssp {
; 64 bit dec
entry:
%s64 = getelementptr inbounds %struct.obj2, %struct.obj2* %o, i64 0, i32 0
; CHECK-NOT: load
%0 = load i64, i64* %s64, align 8
; CHECK: decq ({{.*}})
%dec = add i64 %0, -1
store i64 %dec, i64* %s64, align 8
%tobool = icmp eq i64 %dec, 0
br i1 %tobool, label %if.end, label %return
; 32 bit dec
if.end:
%s32 = getelementptr inbounds %struct.obj2, %struct.obj2* %o, i64 0, i32 1
; CHECK-NOT: load
%1 = load i32, i32* %s32, align 4
; CHECK: decl {{[0-9][0-9]*}}({{.*}})
%dec1 = add i32 %1, -1
store i32 %dec1, i32* %s32, align 4
%tobool2 = icmp eq i32 %dec1, 0
br i1 %tobool2, label %if.end1, label %return
; 16 bit dec
if.end1:
%s16 = getelementptr inbounds %struct.obj2, %struct.obj2* %o, i64 0, i32 2
; CHECK-NOT: load
%2 = load i16, i16* %s16, align 2
; CHECK: decw {{[0-9][0-9]*}}({{.*}})
%dec2 = add i16 %2, -1
store i16 %dec2, i16* %s16, align 2
%tobool3 = icmp eq i16 %dec2, 0
br i1 %tobool3, label %if.end2, label %return
; 8 bit dec
if.end2:
%s8 = getelementptr inbounds %struct.obj2, %struct.obj2* %o, i64 0, i32 3
; CHECK-NOT: load
%3 = load i8, i8* %s8
; CHECK: decb {{[0-9][0-9]*}}({{.*}})
%dec3 = add i8 %3, -1
store i8 %dec3, i8* %s8
%tobool4 = icmp eq i8 %dec3, 0
br i1 %tobool4, label %if.end4, label %return
if.end4:
tail call void @other(%struct.obj2* %o) nounwind
br label %return
return: ; preds = %if.end4, %if.end, %entry
ret void
}
; CHECK: example_inc
define void @example_inc(%struct.obj2* %o) nounwind uwtable ssp {
; 64 bit inc
entry:
%s64 = getelementptr inbounds %struct.obj2, %struct.obj2* %o, i64 0, i32 0
; CHECK-NOT: load
%0 = load i64, i64* %s64, align 8
; CHECK: incq ({{.*}})
%inc = add i64 %0, 1
store i64 %inc, i64* %s64, align 8
%tobool = icmp eq i64 %inc, 0
br i1 %tobool, label %if.end, label %return
; 32 bit inc
if.end:
%s32 = getelementptr inbounds %struct.obj2, %struct.obj2* %o, i64 0, i32 1
; CHECK-NOT: load
%1 = load i32, i32* %s32, align 4
; CHECK: incl {{[0-9][0-9]*}}({{.*}})
%inc1 = add i32 %1, 1
store i32 %inc1, i32* %s32, align 4
%tobool2 = icmp eq i32 %inc1, 0
br i1 %tobool2, label %if.end1, label %return
; 16 bit inc
if.end1:
%s16 = getelementptr inbounds %struct.obj2, %struct.obj2* %o, i64 0, i32 2
; CHECK-NOT: load
%2 = load i16, i16* %s16, align 2
; CHECK: incw {{[0-9][0-9]*}}({{.*}})
%inc2 = add i16 %2, 1
store i16 %inc2, i16* %s16, align 2
%tobool3 = icmp eq i16 %inc2, 0
br i1 %tobool3, label %if.end2, label %return
; 8 bit inc
if.end2:
%s8 = getelementptr inbounds %struct.obj2, %struct.obj2* %o, i64 0, i32 3
; CHECK-NOT: load
%3 = load i8, i8* %s8
; CHECK: incb {{[0-9][0-9]*}}({{.*}})
%inc3 = add i8 %3, 1
store i8 %inc3, i8* %s8
%tobool4 = icmp eq i8 %inc3, 0
br i1 %tobool4, label %if.end4, label %return
if.end4:
tail call void @other(%struct.obj2* %o) nounwind
br label %return
return:
ret void
}
; Deal with TokenFactor chain
; rdar://11236106
@foo = external global i64*, align 8
define void @test3() nounwind ssp {
entry:
; CHECK-LABEL: test3:
; CHECK: decq 16(%rax)
%0 = load i64*, i64** @foo, align 8
%arrayidx = getelementptr inbounds i64, i64* %0, i64 2
%1 = load i64, i64* %arrayidx, align 8
%dec = add i64 %1, -1
store i64 %dec, i64* %arrayidx, align 8
%cmp = icmp eq i64 %dec, 0
br i1 %cmp, label %if.then, label %if.end
if.then:
tail call void @baz() nounwind
br label %if.end
if.end:
ret void
}
declare void @baz()
; Avoid creating a cycle in the DAG which would trigger an assert in the
; scheduler.
; PR12565
; rdar://11451474
@x = external global i32, align 4
@y = external global i32, align 4
@z = external global i32, align 4
define void @test4() nounwind uwtable ssp {
entry:
%0 = load i32, i32* @x, align 4
%1 = load i32, i32* @y, align 4
%dec = add nsw i32 %1, -1
store i32 %dec, i32* @y, align 4
%tobool.i = icmp ne i32 %dec, 0
%cond.i = select i1 %tobool.i, i32 %0, i32 0
store i32 %cond.i, i32* @z, align 4
ret void
}
|
