1; RUN: opt -debug-pass=Executions -phi-values -memcpyopt -instcombine -disable-output < %s 2>&1 | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-MEMCPY
2; RUN: opt -debug-pass=Executions -memdep -instcombine -disable-output < %s 2>&1 | FileCheck %s -check-prefix=CHECK
3
4; Check that phi values is not run when it's not already available, and that
5; basicaa is not freed after a pass that preserves CFG, as it preserves CFG.
6
7; CHECK: Executing Pass 'Phi Values Analysis'
8; CHECK: Executing Pass 'Basic Alias Analysis (stateless AA impl)'
9; CHECK: Executing Pass 'Memory Dependence Analysis'
10; CHECK-MEMCPY: Executing Pass 'MemCpy Optimization'
11; CHECK-MEMCPY-DAG: Freeing Pass 'MemCpy Optimization'
12; CHECK-DAG: Freeing Pass 'Phi Values Analysis'
13; CHECK-DAG: Freeing Pass 'Memory Dependence Analysis'
14; CHECK-MEMCPY-NOT: Freeing Pass 'Basic Alias Analysis (stateless AA impl)'
15; CHECK-NOT: Executing Pass 'Phi Values Analysis'
16; CHECK-NOT: Executing Pass 'Basic Alias Analysis (stateless AA impl)'
17; CHECK: Executing Pass 'Combine redundant instructions'
18
19target datalayout = "p:8:8-n8"
20
21declare void @otherfn([4 x i8]*)
22declare i32 @__gxx_personality_v0(...)
23declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)
24@c = external global i8*, align 1
25
26; This function is one where if we didn't free basicaa after memcpyopt then the
27; usage of basicaa in instcombine would cause a segfault due to stale phi-values
28; results being used.
29define void @fn(i8* %this, i64* %ptr) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
30entry:
31  %arr = alloca [4 x i8], align 8
32  %gep1 = getelementptr inbounds [4 x i8], [4 x i8]* %arr, i64 0, i32 0
33  br i1 undef, label %then, label %if
34
35if:
36  br label %then
37
38then:
39  %phi = phi i64* [ %ptr, %if ], [ null, %entry ]
40  store i8 1, i8* %gep1, align 8
41  %load = load i64, i64* %phi, align 8
42  %gep2 = getelementptr inbounds i8, i8* undef, i64 %load
43  %gep3 = getelementptr inbounds i8, i8* %gep2, i64 40
44  invoke i32 undef(i8* undef)
45     to label %invoke unwind label %lpad
46
47invoke:
48  unreachable
49
50lpad:
51  landingpad { i8*, i32 }
52     catch i8* null
53  call void @otherfn([4 x i8]* nonnull %arr)
54  unreachable
55}
56
57; When running instcombine after memdep, the basicaa used by instcombine uses
58; the phivalues that memdep used. This would then cause a segfault due to
59; instcombine deleting a phi whose values had been cached.
60define void @fn2() {
61entry:
62  %a = alloca i8, align 1
63  %0 = load i8*, i8** @c, align 1
64  %1 = bitcast i8* %0 to i8**
65  br label %for.cond
66
67for.cond:                                         ; preds = %for.body, %entry
68  %d.0 = phi i8** [ %1, %entry ], [ null, %for.body ]
69  br i1 undef, label %for.body, label %for.cond.cleanup
70
71for.body:                                         ; preds = %for.cond
72  store volatile i8 undef, i8* %a, align 1
73  br label %for.cond
74
75for.cond.cleanup:                                 ; preds = %for.cond
76  call void @llvm.lifetime.end.p0i8(i64 1, i8* %a)
77  %2 = load i8*, i8** %d.0, align 1
78  store i8* %2, i8** @c, align 1
79  ret void
80}
81