sext.ll
4.19 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
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -correlated-propagation -S | FileCheck %s
; Check that debug locations are preserved. For more info see:
; https://llvm.org/docs/SourceLevelDebugging.html#fixing-errors
; RUN: opt < %s -enable-debugify -correlated-propagation -S 2>&1 | \
; RUN: FileCheck %s -check-prefix=DEBUG
; DEBUG: CheckModuleDebugify: PASS
declare void @use64(i64)
define void @test1(i32 %n) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: [[A:%.*]] = phi i32 [ [[N:%.*]], [[ENTRY:%.*]] ], [ [[EXT:%.*]], [[FOR_BODY:%.*]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[A]], -1
; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[EXT_WIDE1:%.*]] = zext i32 [[A]] to i64
; CHECK-NEXT: call void @use64(i64 [[EXT_WIDE1]])
; CHECK-NEXT: [[EXT]] = trunc i64 [[EXT_WIDE1]] to i32
; CHECK-NEXT: br label [[FOR_COND]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
br label %for.cond
for.cond: ; preds = %for.body, %entry
%a = phi i32 [ %n, %entry ], [ %ext, %for.body ]
%cmp = icmp sgt i32 %a, -1
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
%ext.wide = sext i32 %a to i64
call void @use64(i64 %ext.wide)
%ext = trunc i64 %ext.wide to i32
br label %for.cond
for.end: ; preds = %for.cond
ret void
}
;; Negative test to show transform doesn't happen unless n >= 0.
define void @test2(i32 %n) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: [[A:%.*]] = phi i32 [ [[N:%.*]], [[ENTRY:%.*]] ], [ [[EXT:%.*]], [[FOR_BODY:%.*]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[A]], -2
; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[EXT_WIDE:%.*]] = sext i32 [[A]] to i64
; CHECK-NEXT: call void @use64(i64 [[EXT_WIDE]])
; CHECK-NEXT: [[EXT]] = trunc i64 [[EXT_WIDE]] to i32
; CHECK-NEXT: br label [[FOR_COND]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
br label %for.cond
for.cond: ; preds = %for.body, %entry
%a = phi i32 [ %n, %entry ], [ %ext, %for.body ]
%cmp = icmp sgt i32 %a, -2
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
%ext.wide = sext i32 %a to i64
call void @use64(i64 %ext.wide)
%ext = trunc i64 %ext.wide to i32
br label %for.cond
for.end: ; preds = %for.cond
ret void
}
;; Non looping test case.
define void @test3(i32 %n) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[N:%.*]], -1
; CHECK-NEXT: br i1 [[CMP]], label [[BB:%.*]], label [[EXIT:%.*]]
; CHECK: bb:
; CHECK-NEXT: [[EXT_WIDE1:%.*]] = zext i32 [[N]] to i64
; CHECK-NEXT: call void @use64(i64 [[EXT_WIDE1]])
; CHECK-NEXT: [[EXT:%.*]] = trunc i64 [[EXT_WIDE1]] to i32
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
entry:
%cmp = icmp sgt i32 %n, -1
br i1 %cmp, label %bb, label %exit
bb:
%ext.wide = sext i32 %n to i64
call void @use64(i64 %ext.wide)
%ext = trunc i64 %ext.wide to i32
br label %exit
exit:
ret void
}
;; Non looping negative test case.
define void @test4(i32 %n) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[N:%.*]], -2
; CHECK-NEXT: br i1 [[CMP]], label [[BB:%.*]], label [[EXIT:%.*]]
; CHECK: bb:
; CHECK-NEXT: [[EXT_WIDE:%.*]] = sext i32 [[N]] to i64
; CHECK-NEXT: call void @use64(i64 [[EXT_WIDE]])
; CHECK-NEXT: [[EXT:%.*]] = trunc i64 [[EXT_WIDE]] to i32
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
entry:
%cmp = icmp sgt i32 %n, -2
br i1 %cmp, label %bb, label %exit
bb:
%ext.wide = sext i32 %n to i64
call void @use64(i64 %ext.wide)
%ext = trunc i64 %ext.wide to i32
br label %exit
exit:
ret void
}