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1; RUN: opt %s -rewrite-statepoints-for-gc -S 2>&1 | FileCheck %s
2
3declare i64 addrspace(1)* @generate_obj()
4declare void @use_obj(i64 addrspace(1)*)
5
6; The rewriting needs to make %obj loop variant by inserting a phi
7; of the original value and it's relocation.
8define void @def_use_safepoint() gc "statepoint-example" {
9; CHECK-LABEL: def_use_safepoint
10entry:
11  %obj = call i64 addrspace(1)* @generate_obj()
12  br label %loop
13
14loop:
15; CHECK: phi i64 addrspace(1)*
16; CHECK-DAG: [ %obj.relocated.casted, %loop ]
17; CHECK-DAG: [ %obj, %entry ]
18  call void @use_obj(i64 addrspace(1)* %obj)
19  %safepoint_token = call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @do_safepoint, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
20  br label %loop
21}
22
23declare void @do_safepoint()
24
25declare void @parse_point(i64 addrspace(1)*)
26
27define i64 addrspace(1)* @test1(i32 %caller, i8 addrspace(1)* %a, i8 addrspace(1)* %b, i32 %unknown) gc "statepoint-example" {
28; CHECK-LABEL: test1
29 entry:
30  br i1 undef, label %left, label %right
31
32 left:
33  %a.cast = bitcast i8 addrspace(1)* %a to i64 addrspace(1)*
34; CHECK: left:
35; CHECK-NEXT: %a.cast = bitcast i8 addrspace(1)* %a to i64 addrspace(1)*
36; CHECK-NEXT: [[CAST_L:%.*]] = bitcast i8 addrspace(1)* %a to i64 addrspace(1)*
37
38; Our safepoint placement pass calls removeUnreachableBlocks, which does a bunch
39; of simplifications to branch instructions.  This bug is visible only when
40; there are multiple branches into the same block from the same predecessor, and
41; the following ceremony is to make that artefact survive a call to
42; removeUnreachableBlocks.  As an example, "br i1 undef, label %merge, label %merge"
43; will get simplified to "br label %merge" by removeUnreachableBlocks.
44  switch i32 %unknown, label %right [ i32 0, label %merge
45                                      i32 1, label %merge
46                                      i32 5, label %merge
47                                      i32 3, label %right ]
48
49 right:
50  %b.cast = bitcast i8 addrspace(1)* %b to i64 addrspace(1)*
51  br label %merge
52; CHECK: right:
53; CHECK-NEXT: %b.cast = bitcast i8 addrspace(1)* %b to i64 addrspace(1)*
54; CHECK-NEXT: [[CAST_R:%.*]] = bitcast i8 addrspace(1)* %b to i64 addrspace(1)*
55
56 merge:
57; CHECK: merge:
58; CHECK-NEXT: %value.base = phi i64 addrspace(1)* [ [[CAST_L]], %left ], [ [[CAST_L]], %left ], [ [[CAST_L]], %left ], [ [[CAST_R]], %right ], !is_base_value !0
59  %value = phi i64 addrspace(1)* [ %a.cast, %left], [ %a.cast, %left], [ %a.cast, %left], [ %b.cast, %right]
60  %safepoint_token = call i32 (i64, i32, void (i64 addrspace(1)*)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(i64 0, i32 0, void (i64 addrspace(1)*)* @parse_point, i32 1, i32 0, i64 addrspace(1)* %value, i32 0, i32 5, i32 0, i32 0, i32 0, i32 0, i32 0)
61
62  ret i64 addrspace(1)* %value
63}
64
65;; The purpose of this test is to ensure that when two live values share a
66;;  base defining value with inherent conflicts, we end up with a *single*
67;;  base phi/select per such node.  This is testing an optimization, not a
68;;  fundemental correctness criteria
69define void @test2(i1 %cnd, i64 addrspace(1)* %base_obj, i64 addrspace(1)* %base_arg2)  gc "statepoint-example" {
70; CHECK-LABEL: @test2
71entry:
72  %obj = getelementptr i64, i64 addrspace(1)* %base_obj, i32 1
73  br label %loop
74
75loop:                                             ; preds = %loop, %entry
76; CHECK-LABEL: loop
77; CHECK:   %current.base = phi i64 addrspace(1)*
78; CHECK-DAG: [ %base_obj, %entry ]
79; Given the two selects are equivelent, so are their base phis - ideally,
80; we'd have commoned these, but that's a missed optimization, not correctness.
81; CHECK-DAG: [ [[DISCARD:%.*.base.relocated.casted]], %loop ]
82; CHECK-NOT: extra.base
83; CHECK: next = select
84; CHECK: extra2.base = select
85; CHECK: extra2 = select
86; CHECK: statepoint
87;; Both 'next' and 'extra2' are live across the backedge safepoint...
88  %current = phi i64 addrspace(1)* [ %obj, %entry ], [ %next, %loop ]
89  %extra = phi i64 addrspace(1)* [ %obj, %entry ], [ %extra2, %loop ]
90  %nexta = getelementptr i64, i64 addrspace(1)* %current, i32 1
91  %next = select i1 %cnd, i64 addrspace(1)* %nexta, i64 addrspace(1)* %base_arg2
92  %extra2 = select i1 %cnd, i64 addrspace(1)* %nexta, i64 addrspace(1)* %base_arg2
93  %safepoint_token = call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
94  br label %loop
95}
96
97define i64 addrspace(1)* @test3(i1 %cnd, i64 addrspace(1)* %obj,
98                                i64 addrspace(1)* %obj2)
99    gc "statepoint-example" {
100; CHECK-LABEL: @test3
101entry:
102  br i1 %cnd, label %merge, label %taken
103taken:
104  br label %merge
105merge:
106; CHECK-LABEL: merge:
107; CHECK-NEXT: %bdv = phi
108; CHECK-NEXT: gc.statepoint
109  %bdv = phi i64 addrspace(1)* [ %obj, %entry ], [ %obj2, %taken ]
110  %safepoint_token = call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
111  ret i64 addrspace(1)* %bdv
112}
113
114define i64 addrspace(1)* @test4(i1 %cnd, i64 addrspace(1)* %obj,
115                                i64 addrspace(1)* %obj2)
116    gc "statepoint-example" {
117; CHECK-LABEL: @test4
118entry:
119  br i1 %cnd, label %merge, label %taken
120taken:
121  br label %merge
122merge:
123; CHECK-LABEL: merge:
124; CHECK-NEXT: %bdv = phi
125; CHECK-NEXT: gc.statepoint
126  %bdv = phi i64 addrspace(1)* [ %obj, %entry ], [ %obj, %taken ]
127  %safepoint_token = call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
128  ret i64 addrspace(1)* %bdv
129}
130
131define i64 addrspace(1)* @test5(i1 %cnd, i64 addrspace(1)* %obj,
132                                i64 addrspace(1)* %obj2)
133    gc "statepoint-example" {
134; CHECK-LABEL: @test5
135entry:
136  br label %merge
137merge:
138; CHECK-LABEL: merge:
139; CHECK-NEXT: %bdv = phi
140; CHECK-NEXT: br i1
141  %bdv = phi i64 addrspace(1)* [ %obj, %entry ], [ %obj2, %merge ]
142  br i1 %cnd, label %merge, label %next
143next:
144  %safepoint_token = call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
145  ret i64 addrspace(1)* %bdv
146}
147
148
149declare void @foo()
150declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
151declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(i64, i32, void (i64 addrspace(1)*)*, i32, i32, ...)
152