source: icGREP/icgrep-devel/llvm-3.8.0.src/test/Analysis/CFLAliasAnalysis/branch-alias.ll @ 5027

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

Upgrade to llvm 3.8

File size: 2.3 KB
Line 
1; Makes sure that we give up on some pathological cases with inttoptr/ptrtoint
2;
3; @ptr_test was generated from the following C code:
4;  void ptr_test() {
5;    int* A;
6;    unsigned long RefCopy = 0;
7;    for (int i = 0; i < 8*sizeof(&A); ++i) {
8;      if ((unsigned long)&A & (1UL << i))
9;        RefCopy |= 1UL << i;
10;    }
11;
12;    int** AliasA1 = (int**)RefCopy;
13;    int* ShouldAliasA = *AliasA1;
14;  }
15
16; RUN: opt < %s -disable-basicaa -cfl-aa -aa-eval -print-may-aliases -disable-output 2>&1 | FileCheck %s
17
18; CHECK: Function: ptr_test
19define void @ptr_test() #0 {
20  ; CHECK: MayAlias: i32** %A, i32** %ShouldAliasA
21  ; CHECK-NOT: %AliasA1
22entry:
23  %A = alloca i32*, align 8
24  %RefCopy = alloca i64, align 8
25  %i = alloca i32, align 4
26  %AliasA1 = alloca i32**, align 8
27  %ShouldAliasA = alloca i32*, align 8
28  store i64 0, i64* %RefCopy, align 8
29  store i32 0, i32* %i, align 4
30  br label %for.cond
31
32for.cond:                                         ; preds = %for.inc, %entry
33  %0 = load i32, i32* %i, align 4
34  %conv = sext i32 %0 to i64
35  %cmp = icmp ult i64 %conv, 64
36  br i1 %cmp, label %for.body, label %for.end
37
38for.body:                                         ; preds = %for.cond
39  %1 = ptrtoint i32** %A to i64
40  %2 = load i32, i32* %i, align 4
41  %sh_prom = zext i32 %2 to i64
42  %shl = shl i64 1, %sh_prom
43  %and = and i64 %1, %shl
44  %tobool = icmp ne i64 %and, 0
45  br i1 %tobool, label %if.then, label %if.end
46
47if.then:                                          ; preds = %for.body
48  %3 = load i32, i32* %i, align 4
49  %sh_prom2 = zext i32 %3 to i64
50  %shl3 = shl i64 1, %sh_prom2
51  %4 = load i64, i64* %RefCopy, align 8
52  %or = or i64 %4, %shl3
53  store i64 %or, i64* %RefCopy, align 8
54  br label %if.end
55
56if.end:                                           ; preds = %if.then, %for.body
57  br label %for.inc
58
59for.inc:                                          ; preds = %if.end
60  %5 = load i32, i32* %i, align 4
61  %inc = add nsw i32 %5, 1
62  store i32 %inc, i32* %i, align 4
63  br label %for.cond
64
65for.end:                                          ; preds = %for.cond
66  %6 = load i64, i64* %RefCopy, align 8
67  %7 = inttoptr i64 %6 to i32**
68  store i32** %7, i32*** %AliasA1, align 8
69  %8 = load i32**, i32*** %AliasA1, align 8
70  %9 = load i32*, i32** %8, align 8
71  store i32* %9, i32** %ShouldAliasA, align 8
72  ret void
73}
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