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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -S -passes='simplifycfg<sink-common-insts;switch-to-lookup>' < %s | FileCheck %s
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
define void @pr104567(i8 %x, ptr %f) {
; CHECK-LABEL: define void @pr104567(
; CHECK-SAME: i8 [[X:%.*]], ptr [[F:%.*]]) {
; CHECK-NEXT: [[START:.*:]]
; CHECK-NEXT: [[Y:%.*]] = alloca [1 x i8], align 1
; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 1, ptr nonnull [[Y]])
; CHECK-NEXT: [[SWITCH_OFFSET:%.*]] = add nsw i8 [[X]], 4
; CHECK-NEXT: store i8 [[SWITCH_OFFSET]], ptr [[Y]], align 1
; CHECK-NEXT: call void [[F]](ptr [[Y]])
; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 1, ptr nonnull [[Y]])
; CHECK-NEXT: ret void
;
start:
%y = alloca [1 x i8], align 1
call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %y)
switch i8 %x, label %default.unreachable [
i8 0, label %bb4
i8 1, label %bb3
i8 2, label %bb2
]
default.unreachable:
unreachable
bb4:
store i8 4, ptr %y, align 1
br label %bb5
bb3:
store i8 5, ptr %y, align 1
br label %bb5
bb2:
store i8 6, ptr %y, align 1
br label %bb5
bb5:
call void %f(ptr %y)
call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %y)
ret void
}
define i64 @dont_make_div_variable(i64 noundef %x, i64 noundef %i) {
; CHECK-LABEL: define i64 @dont_make_div_variable(
; CHECK-SAME: i64 noundef [[X:%.*]], i64 noundef [[I:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: switch i64 [[I]], label %[[SW_DEFAULT:.*]] [
; CHECK-NEXT: i64 9, label %[[SW_BB:.*]]
; CHECK-NEXT: i64 10, label %[[SW_BB1:.*]]
; CHECK-NEXT: i64 11, label %[[SW_BB3:.*]]
; CHECK-NEXT: i64 12, label %[[SW_BB5:.*]]
; CHECK-NEXT: ]
; CHECK: [[SW_BB]]:
; CHECK-NEXT: [[DIV:%.*]] = udiv i64 [[X]], 9
; CHECK-NEXT: br label %[[RETURN:.*]]
; CHECK: [[SW_BB1]]:
; CHECK-NEXT: [[DIV2:%.*]] = udiv i64 [[X]], 10
; CHECK-NEXT: br label %[[RETURN]]
; CHECK: [[SW_BB3]]:
; CHECK-NEXT: [[DIV4:%.*]] = udiv i64 [[X]], 11
; CHECK-NEXT: br label %[[RETURN]]
; CHECK: [[SW_BB5]]:
; CHECK-NEXT: [[DIV7:%.*]] = udiv i64 [[X]], 12
; CHECK-NEXT: br label %[[RETURN]]
; CHECK: [[SW_DEFAULT]]:
; CHECK-NEXT: unreachable
; CHECK: [[RETURN]]:
; CHECK-NEXT: [[DIV6:%.*]] = phi i64 [ [[DIV7]], %[[SW_BB5]] ], [ [[DIV4]], %[[SW_BB3]] ], [ [[DIV2]], %[[SW_BB1]] ], [ [[DIV]], %[[SW_BB]] ]
; CHECK-NEXT: ret i64 [[DIV6]]
;
entry:
switch i64 %i, label %sw.default [
i64 9, label %sw.bb
i64 10, label %sw.bb1
i64 11, label %sw.bb3
i64 12, label %sw.bb5
]
sw.bb:
%div = udiv i64 %x, 9
br label %return
sw.bb1:
%div2 = udiv i64 %x, 10
br label %return
sw.bb3:
%div4 = udiv i64 %x, 11
br label %return
sw.bb5:
%div6 = udiv i64 %x, 12
br label %return
sw.default:
unreachable
return:
%retval.0 = phi i64 [ %div6, %sw.bb5 ], [ %div4, %sw.bb3 ], [ %div2, %sw.bb1 ], [ %div, %sw.bb ]
ret i64 %retval.0
}
define i64 @okay_to_make_div_variable(i64 noundef %x, i64 noundef %i) {
; CHECK-LABEL: define i64 @okay_to_make_div_variable(
; CHECK-SAME: i64 noundef [[X:%.*]], i64 noundef [[I:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[SWITCH_TABLEIDX:%.*]] = sub nsw i64 [[I]], 9
; CHECK-NEXT: [[SWITCH_OFFSET:%.*]] = add nsw i64 [[SWITCH_TABLEIDX]], 9
; CHECK-NEXT: [[DIV6:%.*]] = udiv i64 [[SWITCH_OFFSET]], [[X]]
; CHECK-NEXT: ret i64 [[DIV6]]
;
entry:
switch i64 %i, label %sw.default [
i64 9, label %sw.bb
i64 10, label %sw.bb1
i64 11, label %sw.bb3
i64 12, label %sw.bb5
]
sw.bb:
%div = udiv i64 9, %x
br label %return
sw.bb1:
%div2 = udiv i64 10, %x
br label %return
sw.bb3:
%div4 = udiv i64 11, %x
br label %return
sw.bb5:
%div6 = udiv i64 12, %x
br label %return
sw.default:
unreachable
return:
%retval.0 = phi i64 [ %div6, %sw.bb5 ], [ %div4, %sw.bb3 ], [ %div2, %sw.bb1 ], [ %div, %sw.bb ]
ret i64 %retval.0
}
|
