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