1; RUN: opt -hexagon-loop-idiom -loop-deletion -gvn -S < %s
2; REQUIRES: asserts
3
4; This tests that the HexagonLoopIdiom pass does not mark LCSSA information
5; as preserved. The pass calls SimplifyInstruction is a couple of places,
6; which can invalidate LCSSA. Specifically, the uses of a LCSSA phi variable
7; are replaced by the incoming value.
8
9define hidden void @test() local_unnamed_addr #0 {
10entry:
11  br label %if.then63
12
13if.then63:
14  br i1 undef, label %do.body311, label %if.end375
15
16do.body311:
17  br i1 undef, label %do.end318, label %do.body311
18
19do.end318:
20  br i1 undef, label %if.end322, label %if.end375
21
22if.end322:
23  %sub325 = sub i32 undef, undef
24  br i1 undef, label %do.end329, label %do.body311
25
26do.end329:
27  %sub325.lcssa = phi i32 [ %sub325, %if.end322 ]
28  br label %do.body330
29
30do.body330:
31  %row_width.7 = phi i32 [ %sub325.lcssa, %do.end329 ], [ %dec334, %do.body330 ]
32  %sp.5 = phi i8* [ undef, %do.end329 ], [ %incdec.ptr331, %do.body330 ]
33  %dp.addr.5 = phi i8* [ undef, %do.end329 ], [ %incdec.ptr332, %do.body330 ]
34  %0 = load i8, i8* %sp.5, align 1
35  store i8 %0, i8* %dp.addr.5, align 1
36  %incdec.ptr332 = getelementptr inbounds i8, i8* %dp.addr.5, i32 1
37  %incdec.ptr331 = getelementptr inbounds i8, i8* %sp.5, i32 1
38  %dec334 = add i32 %row_width.7, -1
39  %cmp335 = icmp eq i32 %dec334, 0
40  br i1 %cmp335, label %if.end375, label %do.body330
41
42if.end375:
43  ret void
44}
45
46attributes #0 = { nounwind }
47