source: icGREP/icgrep-devel/llvm-3.8.0.src/test/CodeGen/ARM/2011-08-25-ldmia_ret.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

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1; RUN: llc < %s -mtriple=thumbv7-apple-ios -mcpu=cortex-a9 | FileCheck %s
2; Test that ldmia_ret preserves implicit operands for return values.
3;
4; This CFG is reduced from a benchmark miscompile. With current
5; if-conversion heuristics, one of the return paths is if-converted
6; into sw.bb18 resulting in an ldmia_ret in the middle of the
7; block. The postra scheduler needs to know that the return implicitly
8; uses the return register, otherwise its antidep breaker scavenges
9; the register in order to hoist the constant load required to test
10; the switch.
11
12declare i32 @getint()
13declare i1 @getbool()
14declare void @foo(i32)
15declare i32 @bar(i32)
16
17define i32 @test(i32 %in1, i32 %in2) nounwind {
18entry:
19  %call = tail call zeroext i1 @getbool() nounwind
20  br i1 %call, label %sw.bb18, label %sw.bb2
21
22sw.bb2:                                           ; preds = %entry
23  %cmp = tail call zeroext i1 @getbool() nounwind
24  br i1 %cmp, label %sw.epilog58, label %land.lhs.true
25
26land.lhs.true:                                    ; preds = %sw.bb2
27  %cmp13 = tail call zeroext i1 @getbool() nounwind
28  br i1 %cmp13, label %if.then, label %sw.epilog58
29
30if.then:                                          ; preds = %land.lhs.true
31  tail call void @foo(i32 %in1) nounwind
32  br label %sw.epilog58
33
34; load the return value
35; CHECK: movs   [[RRET:r.]], #2
36; hoist the switch constant without clobbering RRET
37; CHECK: movw
38; CHECK-NOT: [[RRET]]
39; CHECK: , #63707
40; CHECK-NOT: [[RRET]]
41; CHECK: tst
42; If-convert the return
43; CHECK: it     ne
44; Fold the CSR+return into a pop
45; CHECK: pop {r4, r5, r7, pc}
46sw.bb18:
47  %call20 = tail call i32 @bar(i32 %in2) nounwind
48  switch i32 %call20, label %sw.default56 [
49    i32 168, label %sw.bb21
50    i32 165, label %sw.bb21
51    i32 261, label %sw.epilog58
52    i32 188, label %sw.epilog58
53    i32 187, label %sw.epilog58
54    i32 186, label %sw.epilog58
55    i32 185, label %sw.epilog58
56    i32 184, label %sw.epilog58
57    i32 175, label %sw.epilog58
58    i32 174, label %sw.epilog58
59    i32 173, label %sw.epilog58
60    i32 172, label %sw.epilog58
61    i32 171, label %sw.epilog58
62    i32 167, label %sw.epilog58
63    i32 166, label %sw.epilog58
64    i32 164, label %sw.epilog58
65    i32 163, label %sw.epilog58
66    i32 161, label %sw.epilog58
67    i32 160, label %sw.epilog58
68    i32 -1, label %sw.bb33
69  ]
70
71sw.bb21:                                          ; preds = %sw.bb18, %sw.bb18
72  tail call void @foo(i32 %in2) nounwind
73  %call28 = tail call i32 @getint() nounwind
74  %tobool = icmp eq i32 %call28, 0
75  br i1 %tobool, label %if.then29, label %sw.epilog58
76
77if.then29:                                        ; preds = %sw.bb21
78  tail call void @foo(i32 %in2) nounwind
79  br label %sw.epilog58
80
81sw.bb33:                                          ; preds = %sw.bb18
82  %cmp42 = tail call zeroext i1 @getbool() nounwind
83  br i1 %cmp42, label %sw.default56, label %land.lhs.true44
84
85land.lhs.true44:                                  ; preds = %sw.bb33
86  %call50 = tail call i32 @getint() nounwind
87  %cmp51 = icmp slt i32 %call50, 0
88  br i1 %cmp51, label %if.then53, label %sw.default56
89
90if.then53:                                        ; preds = %land.lhs.true44
91  tail call void @foo(i32 %in2) nounwind
92  br label %sw.default56
93
94sw.default56:                                     ; preds = %sw.bb33, %land.lhs.true44, %if.then53, %sw.bb18
95  br label %sw.epilog58
96
97sw.epilog58:
98  %retval.0 = phi i32 [ 4, %sw.default56 ], [ 2, %sw.bb21 ], [ 2, %if.then29 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb2 ], [ 2, %land.lhs.true ], [ 2, %if.then ]
99  ret i32 %retval.0
100}
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