source: icGREP/icgrep-devel/llvm-3.8.0.src/test/Analysis/BasicAA/phi-and-select.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

Upgrade to llvm 3.8

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Line 
1; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
2
3; BasicAA should detect NoAliases in PHIs and Selects.
4
5; CHECK: Function: foo
6; CHECK:  NoAlias: double* %a, double* %b
7; CHECK: Function: bar
8; CHECK:  NoAlias: double* %a, double* %b
9; CHECK: Function: qux
10; CHECK:  NoAlias: double* %a, double* %b
11; CHECK: Function: fin
12; CHECK:  NoAlias: double* %a, double* %b
13; CHECK: ===== Alias Analysis Evaluator Report =====
14
15; Two PHIs in the same block.
16define void @foo(i1 %m, double* noalias %x, double* noalias %y) {
17entry:
18  br i1 %m, label %true, label %false
19
20true:
21  br label %exit
22
23false:
24  br label %exit
25
26exit:
27  %a = phi double* [ %x, %true ], [ %y, %false ]
28  %b = phi double* [ %x, %false ], [ %y, %true ]
29  store volatile double 0.0, double* %a
30  store volatile double 1.0, double* %b
31  ret void
32}
33
34; Two selects with the same condition.
35define void @bar(i1 %m, double* noalias %x, double* noalias %y) {
36entry:
37  %a = select i1 %m, double* %x, double* %y
38  %b = select i1 %m, double* %y, double* %x
39  store volatile double 0.000000e+00, double* %a
40  store volatile double 1.000000e+00, double* %b
41  ret void
42}
43
44; Two PHIs with disjoint sets of inputs.
45define void @qux(i1 %m, double* noalias %x, double* noalias %y,
46                 i1 %n, double* noalias %v, double* noalias %w) {
47entry:
48  br i1 %m, label %true, label %false
49
50true:
51  br label %exit
52
53false:
54  br label %exit
55
56exit:
57  %a = phi double* [ %x, %true ], [ %y, %false ]
58  br i1 %n, label %ntrue, label %nfalse
59
60ntrue:
61  br label %nexit
62
63nfalse:
64  br label %nexit
65
66nexit:
67  %b = phi double* [ %v, %ntrue ], [ %w, %nfalse ]
68  store volatile double 0.0, double* %a
69  store volatile double 1.0, double* %b
70  ret void
71}
72
73; Two selects with disjoint sets of arms.
74define void @fin(i1 %m, double* noalias %x, double* noalias %y,
75                 i1 %n, double* noalias %v, double* noalias %w) {
76entry:
77  %a = select i1 %m, double* %x, double* %y
78  %b = select i1 %n, double* %v, double* %w
79  store volatile double 0.000000e+00, double* %a
80  store volatile double 1.000000e+00, double* %b
81  ret void
82}
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