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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=instcombine -S < %s | FileCheck %s
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc18.0.0"
declare i32 @use(ptr)
; Should be able to sink %ptr load to %not.null block which is the NCD of %ptr users.
define i32 @test1(ptr %addr, i1 %c) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PTR:%.*]] = load ptr, ptr [[ADDR:%.*]], align 8
; CHECK-NEXT: br i1 false, label [[NULL:%.*]], label [[NOT_NULL:%.*]]
; CHECK: null:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: not.null:
; CHECK-NEXT: [[Y:%.*]] = call i32 @use(ptr [[PTR]])
; CHECK-NEXT: br i1 [[C:%.*]], label [[EXIT]], label [[NOT_NULL_2:%.*]]
; CHECK: not.null.2:
; CHECK-NEXT: [[Z:%.*]] = call i32 @use(ptr [[PTR]])
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[P:%.*]] = phi i32 [ poison, [[NULL]] ], [ [[Y]], [[NOT_NULL]] ], [ [[Z]], [[NOT_NULL_2]] ]
; CHECK-NEXT: ret i32 [[P]]
;
entry:
%ptr = load ptr, ptr %addr
%cond = icmp eq ptr %addr, null
br i1 %cond, label %null, label %not.null
null:
%x = call i32 @use(ptr null)
br label %exit
not.null:
%y = call i32 @use(ptr %ptr)
br i1 %c, label %exit, label %not.null.2
not.null.2:
%z = call i32 @use(ptr %ptr)
br label %exit
exit:
%p = phi i32 [ %x, %null ], [ %y, %not.null ], [ %z, %not.null.2 ]
ret i32 %p
}
; Should be able to sink %ptr load to %not.null block which is the NCD of %ptr users.
define i32 @test2(ptr %addr, i1 %c) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[COND:%.*]] = icmp eq ptr [[ADDR:%.*]], null
; CHECK-NEXT: br i1 [[COND]], label [[EXIT:%.*]], label [[LOAD_BB:%.*]]
; CHECK: load.bb:
; CHECK-NEXT: [[PTR:%.*]] = load ptr, ptr [[ADDR]], align 8
; CHECK-NEXT: br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK: left:
; CHECK-NEXT: [[X:%.*]] = call i32 @use(ptr null)
; CHECK-NEXT: br label [[EXIT]]
; CHECK: right:
; CHECK-NEXT: [[Y:%.*]] = call i32 @use(ptr [[PTR]])
; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[RIGHT_2:%.*]]
; CHECK: right.2:
; CHECK-NEXT: [[Z:%.*]] = call i32 @use(ptr [[PTR]])
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[P:%.*]] = phi i32 [ [[X]], [[LEFT]] ], [ [[Y]], [[RIGHT]] ], [ [[Z]], [[RIGHT_2]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: ret i32 [[P]]
;
entry:
%cond = icmp eq ptr %addr, null
br i1 %cond, label %exit, label %load.bb
load.bb:
%ptr = load ptr, ptr %addr
br i1 %c, label %left, label %right
left:
%x = call i32 @use(ptr null)
br label %exit
right:
%y = call i32 @use(ptr %ptr)
br i1 %c, label %exit, label %right.2
right.2:
%z = call i32 @use(ptr %ptr)
br label %exit
exit:
%p = phi i32 [ %x, %left ], [ %y, %right ], [ %z, %right.2 ], [ 0, %entry ]
ret i32 %p
}
|
