phi-aa.ll
3.19 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
; RUN: opt < %s -phi-values -basic-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
; RUN: opt < %s -aa-pipeline=basic-aa -passes='require<phi-values>,aa-eval' -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; rdar://7282591
@X = common global i32 0
@Y = common global i32 0
@Z = common global i32 0
; CHECK-LABEL: foo
; CHECK: NoAlias: i32* %P, i32* @Z
define void @foo(i32 %cond) nounwind {
entry:
%"alloca point" = bitcast i32 0 to i32
%tmp = icmp ne i32 %cond, 0
br i1 %tmp, label %bb, label %bb1
bb:
br label %bb2
bb1:
br label %bb2
bb2:
%P = phi i32* [ @X, %bb ], [ @Y, %bb1 ]
%tmp1 = load i32, i32* @Z, align 4
store i32 123, i32* %P, align 4
%tmp2 = load i32, i32* @Z, align 4
br label %return
return:
ret void
}
; Pointers can vary in between iterations of loops.
; PR18068
; CHECK-LABEL: pr18068
; CHECK: MayAlias: i32* %0, i32* %arrayidx5
; CHECK: NoAlias: i32* %arrayidx13, i32* %arrayidx5
define i32 @pr18068(i32* %jj7, i32* %j) {
entry:
%oa5 = alloca [100 x i32], align 16
br label %codeRepl
codeRepl:
%0 = phi i32* [ %arrayidx13, %for.body ], [ %j, %entry ]
%targetBlock = call i1 @cond(i32* %jj7)
br i1 %targetBlock, label %for.body, label %bye
for.body:
%1 = load i32, i32* %jj7, align 4
%idxprom4 = zext i32 %1 to i64
%arrayidx5 = getelementptr inbounds [100 x i32], [100 x i32]* %oa5, i64 0, i64 %idxprom4
%2 = load i32, i32* %arrayidx5, align 4
%sub6 = sub i32 %2, 6
store i32 %sub6, i32* %arrayidx5, align 4
; %0 and %arrayidx5 can alias! It is not safe to DSE the above store.
%3 = load i32, i32* %0, align 4
store i32 %3, i32* %arrayidx5, align 4
%sub11 = add i32 %1, -1
%idxprom12 = zext i32 %sub11 to i64
%arrayidx13 = getelementptr inbounds [100 x i32], [100 x i32]* %oa5, i64 0, i64 %idxprom12
call void @inc(i32* %jj7)
br label %codeRepl
bye:
%.reload = load i32, i32* %jj7, align 4
ret i32 %.reload
}
declare i1 @cond(i32*)
declare void @inc(i32*)
; When we have a chain of phis in nested loops we should recognise if there's
; actually only one underlying value.
; CHECK-LABEL: loop_phi_chain
; CHECK: NoAlias: i32* %val1, i32* @Y
; CHECK: NoAlias: i32* %val2, i32* @Y
; CHECK: NoAlias: i32* %val3, i32* @Y
define void @loop_phi_chain(i32 %a, i32 %b, i32 %c) {
entry:
br label %loop1
loop1:
%n1 = phi i32 [ 0, %entry ], [ %add1, %loop2 ]
%val1 = phi i32* [ @X, %entry ], [ %val2, %loop2 ]
%add1 = add i32 %n1, 1
%cmp1 = icmp ne i32 %n1, 32
br i1 %cmp1, label %loop2, label %end
loop2:
%n2 = phi i32 [ 0, %loop1 ], [ %add2, %loop3 ]
%val2 = phi i32* [ %val1, %loop1 ], [ %val3, %loop3 ]
%add2 = add i32 %n2, 1
%cmp2 = icmp ne i32 %n2, 32
br i1 %cmp2, label %loop3, label %loop1
loop3:
%n3 = phi i32 [ 0, %loop2 ], [ %add3, %loop3 ]
%val3 = phi i32* [ %val2, %loop2 ], [ %val3, %loop3 ]
store i32 0, i32* %val3, align 4
store i32 0, i32* @Y, align 4
%add3 = add i32 %n3, 1
%cmp3 = icmp ne i32 %n3, 32
br i1 %cmp3, label %loop3, label %loop2
end:
ret void
}