1; RUN: opt < %s -enable-loop-distribute -passes='loop-distribute,loop-mssa(simple-loop-unswitch<nontrivial>),loop-distribute' -o /dev/null -S -debug-pass-manager=verbose 2>&1 | FileCheck %s
2
3
4; Running loop-distribute will result in LoopAccessAnalysis being required and
5; cached in the LoopAnalysisManagerFunctionProxy.
6;
7; CHECK: Running analysis: LoopAccessAnalysis on Loop at depth 2 containing: %loop_a_inner<header><latch><exiting>
8
9
10; Then simple-loop-unswitch is removing/replacing some loops (resulting in
11; Loop objects used as key in the analyses cache is destroyed). So here we
12; want to see that any analysis results cached on the destroyed loop is
13; cleared. A special case here is that loop_a_inner is destroyed when
14; unswitching the parent loop.
15;
16; The bug solved and verified by this test case was related to the
17; SimpleLoopUnswitch not marking the Loop as removed, so we missed clearing
18; the analysis caches.
19;
20; CHECK: Running pass: SimpleLoopUnswitchPass on Loop at depth 1 containing: %loop_begin<header>,%loop_b,%loop_b_inner,%loop_b_inner_exit,%loop_a,%loop_a_inner,%loop_a_inner_exit,%latch<latch><exiting>
21; CHECK-NEXT: Clearing all analysis results for: loop_a_inner
22
23
24; When running loop-distribute the second time we can see that loop_a_inner
25; isn't analysed because the loop no longer exists (instead we find a new loop,
26; loop_a_inner.us). This kind of verifies that it was correct to remove the
27; loop_a_inner related analysis above.
28;
29; CHECK: Running analysis: LoopAccessAnalysis on Loop at depth 2 containing: %loop_a_inner.us<header><latch><exiting>
30
31
32define i32 @test6(i1* %ptr, i1 %cond1, i32* %a.ptr, i32* %b.ptr) {
33entry:
34  br label %loop_begin
35
36loop_begin:
37  %v = load i1, i1* %ptr
38  br i1 %cond1, label %loop_a, label %loop_b
39
40loop_a:
41  br label %loop_a_inner
42
43loop_a_inner:
44  %va = load i1, i1* %ptr
45  %a = load i32, i32* %a.ptr
46  br i1 %va, label %loop_a_inner, label %loop_a_inner_exit
47
48loop_a_inner_exit:
49  %a.lcssa = phi i32 [ %a, %loop_a_inner ]
50  br label %latch
51
52loop_b:
53  br label %loop_b_inner
54
55loop_b_inner:
56  %vb = load i1, i1* %ptr
57  %b = load i32, i32* %b.ptr
58  br i1 %vb, label %loop_b_inner, label %loop_b_inner_exit
59
60loop_b_inner_exit:
61  %b.lcssa = phi i32 [ %b, %loop_b_inner ]
62  br label %latch
63
64latch:
65  %ab.phi = phi i32 [ %a.lcssa, %loop_a_inner_exit ], [ %b.lcssa, %loop_b_inner_exit ]
66  br i1 %v, label %loop_begin, label %loop_exit
67
68loop_exit:
69  %ab.lcssa = phi i32 [ %ab.phi, %latch ]
70  ret i32 %ab.lcssa
71}
72