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1; RUN: llc < %s -verify-coalescing
2; PR14732
3target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
4target triple = "x86_64-apple-macosx10"
5
6@c = common global i32 0, align 4
7@b = common global i32 0, align 4
8@a = common global i32 0, align 4
9@d = common global i32 0, align 4
10
11; This function creates an IMPLICIT_DEF with a long live range, even after
12; ProcessImplicitDefs.
13;
14; The coalescer should be able to deal with all kinds of IMPLICIT_DEF live
15; ranges, even if they are not common.
16
17define void @f() nounwind uwtable ssp {
18entry:
19  %i = alloca i32, align 4
20  br label %for.cond
21
22for.cond:                                         ; preds = %for.inc34, %entry
23  %i.0.load44 = phi i32 [ %inc35, %for.inc34 ], [ undef, %entry ]
24  %pi.0 = phi i32* [ %pi.4, %for.inc34 ], [ undef, %entry ]
25  %tobool = icmp eq i32 %i.0.load44, 0
26  br i1 %tobool, label %for.end36, label %for.body
27
28for.body:                                         ; preds = %for.cond
29  store i32 0, i32* @c, align 4
30  br label %for.body2
31
32for.body2:                                        ; preds = %for.body, %for.inc
33  %i.0.load45 = phi i32 [ %i.0.load44, %for.body ], [ 0, %for.inc ]
34  %tobool3 = icmp eq i32 %i.0.load45, 0
35  br i1 %tobool3, label %if.then10, label %if.then
36
37if.then:                                          ; preds = %for.body2
38  store i32 0, i32* %i, align 4
39  br label %for.body6
40
41for.body6:                                        ; preds = %if.then, %for.body6
42  store i32 0, i32* %i, align 4
43  br i1 true, label %for.body6, label %for.inc
44
45if.then10:                                        ; preds = %for.body2
46  store i32 1, i32* @b, align 4
47  ret void
48
49for.inc:                                          ; preds = %for.body6
50  br i1 undef, label %for.body2, label %if.end30
51
52while.condthread-pre-split:                       ; preds = %label.loopexit, %while.condthread-pre-split.lr.ph.lr.ph, %for.inc27.backedge
53  %0 = phi i32 [ %inc28, %for.inc27.backedge ], [ %inc285863, %while.condthread-pre-split.lr.ph.lr.ph ], [ %inc2858, %label.loopexit ]
54  %inc2060 = phi i32 [ %inc20, %for.inc27.backedge ], [ %a.promoted.pre, %while.condthread-pre-split.lr.ph.lr.ph ], [ %inc20, %label.loopexit ]
55  br label %while.cond
56
57while.cond:                                       ; preds = %while.condthread-pre-split, %while.cond
58  %p2.1.in = phi i32* [ %pi.3.ph, %while.cond ], [ %i, %while.condthread-pre-split ]
59  %p2.1 = bitcast i32* %p2.1.in to i16*
60  br i1 %tobool19, label %while.end, label %while.cond
61
62while.end:                                        ; preds = %while.cond
63  %inc20 = add nsw i32 %inc2060, 1
64  %tobool21 = icmp eq i32 %inc2060, 0
65  br i1 %tobool21, label %for.inc27.backedge, label %if.then22
66
67for.inc27.backedge:                               ; preds = %while.end, %if.then22
68  %inc28 = add nsw i32 %0, 1
69  store i32 %inc28, i32* @b, align 4
70  %tobool17 = icmp eq i32 %inc28, 0
71  br i1 %tobool17, label %for.inc27.if.end30.loopexit56_crit_edge, label %while.condthread-pre-split
72
73if.then22:                                        ; preds = %while.end
74  %1 = load i16, i16* %p2.1, align 2
75  %tobool23 = icmp eq i16 %1, 0
76  br i1 %tobool23, label %for.inc27.backedge, label %label.loopexit
77
78label.loopexit:                                   ; preds = %if.then22
79  store i32 %inc20, i32* @a, align 4
80  %inc2858 = add nsw i32 %0, 1
81  store i32 %inc2858, i32* @b, align 4
82  %tobool1759 = icmp eq i32 %inc2858, 0
83  br i1 %tobool1759, label %if.end30, label %while.condthread-pre-split
84
85for.inc27.if.end30.loopexit56_crit_edge:          ; preds = %for.inc27.backedge
86  store i32 %inc20, i32* @a, align 4
87  br label %if.end30
88
89if.end30:                                         ; preds = %for.inc27.if.end30.loopexit56_crit_edge, %label.loopexit, %label.preheader, %for.inc
90  %i.0.load46 = phi i32 [ 0, %for.inc ], [ %i.0.load4669, %label.preheader ], [ %i.0.load4669, %label.loopexit ], [ %i.0.load4669, %for.inc27.if.end30.loopexit56_crit_edge ]
91  %pi.4 = phi i32* [ %i, %for.inc ], [ %pi.3.ph, %label.preheader ], [ %pi.3.ph, %label.loopexit ], [ %pi.3.ph, %for.inc27.if.end30.loopexit56_crit_edge ]
92  %2 = load i32, i32* %pi.4, align 4
93  %tobool31 = icmp eq i32 %2, 0
94  br i1 %tobool31, label %for.inc34, label %label.preheader
95
96for.inc34:                                        ; preds = %if.end30
97  %inc35 = add nsw i32 %i.0.load46, 1
98  store i32 %inc35, i32* %i, align 4
99  br label %for.cond
100
101for.end36:                                        ; preds = %for.cond
102  store i32 1, i32* %i, align 4
103  %3 = load i32, i32* @c, align 4
104  %tobool37 = icmp eq i32 %3, 0
105  br i1 %tobool37, label %label.preheader, label %land.rhs
106
107land.rhs:                                         ; preds = %for.end36
108  store i32 0, i32* @a, align 4
109  br label %label.preheader
110
111label.preheader:                                  ; preds = %for.end36, %if.end30, %land.rhs
112  %i.0.load4669 = phi i32 [ 1, %land.rhs ], [ %i.0.load46, %if.end30 ], [ 1, %for.end36 ]
113  %pi.3.ph = phi i32* [ %pi.0, %land.rhs ], [ %pi.4, %if.end30 ], [ %pi.0, %for.end36 ]
114  %4 = load i32, i32* @b, align 4
115  %inc285863 = add nsw i32 %4, 1
116  store i32 %inc285863, i32* @b, align 4
117  %tobool175964 = icmp eq i32 %inc285863, 0
118  br i1 %tobool175964, label %if.end30, label %while.condthread-pre-split.lr.ph.lr.ph
119
120while.condthread-pre-split.lr.ph.lr.ph:           ; preds = %label.preheader
121  %.pr50 = load i32, i32* @d, align 4
122  %tobool19 = icmp eq i32 %.pr50, 0
123  %a.promoted.pre = load i32, i32* @a, align 4
124  br label %while.condthread-pre-split
125}
126