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
|
; RUN: opt -debug-pass-manager -aa-pipeline=basic-aa -passes='require<phi-values>,memcpyopt,instcombine' -disable-output < %s 2>&1 | FileCheck %s
; Check that phi values is not run when it's not already available, and that
; basicaa is not freed after a pass that preserves CFG, as it preserves CFG.
; CHECK-DAG: Running analysis: PhiValuesAnalysis
; CHECK-DAG: Running analysis: BasicAA
; CHECK-DAG: Running analysis: MemorySSA
; CHECK: Running pass: MemCpyOptPass
; CHECK-NOT: Invalidating analysis
; CHECK: Running pass: InstCombinePass
target datalayout = "p:8:8-n8"
declare void @otherfn(ptr)
declare i32 @__gxx_personality_v0(...)
declare void @llvm.lifetime.end.p0(i64, ptr nocapture)
@c = external global ptr, align 1
; This function is one where if we didn't free basicaa after memcpyopt then the
; usage of basicaa in instcombine would cause a segfault due to stale phi-values
; results being used.
define void @fn(ptr %this, ptr %ptr) personality ptr @__gxx_personality_v0 {
entry:
%arr = alloca [4 x i8], align 8
br i1 undef, label %then, label %if
if:
br label %then
then:
%phi = phi ptr [ %ptr, %if ], [ null, %entry ]
store i8 1, ptr %arr, align 8
%load = load i64, ptr %phi, align 8
%gep2 = getelementptr inbounds i8, ptr undef, i64 %load
%gep3 = getelementptr inbounds i8, ptr %gep2, i64 40
invoke i32 undef(ptr undef)
to label %invoke unwind label %lpad
invoke:
unreachable
lpad:
landingpad { ptr, i32 }
catch ptr null
call void @otherfn(ptr nonnull %arr)
unreachable
}
; When running instcombine after memdep, the basicaa used by instcombine uses
; the phivalues that memdep used. This would then cause a segfault due to
; instcombine deleting a phi whose values had been cached.
define void @fn2() {
entry:
%a = alloca i8, align 1
%0 = load ptr, ptr @c, align 1
br label %for.cond
for.cond: ; preds = %for.body, %entry
%d.0 = phi ptr [ %0, %entry ], [ null, %for.body ]
br i1 undef, label %for.body, label %for.cond.cleanup
for.body: ; preds = %for.cond
store volatile i8 undef, ptr %a, align 1
br label %for.cond
for.cond.cleanup: ; preds = %for.cond
call void @llvm.lifetime.end.p0(i64 1, ptr %a)
%1 = load ptr, ptr %d.0, align 1
store ptr %1, ptr @c, align 1
ret void
}
|
