1 ; A collection of liveness test cases to ensure we're reporting the
2 ; correct live values at statepoints
3 ; RUN: opt -rewrite-statepoints-for-gc -S < %s | FileCheck %s
6 ; Tests to make sure we consider %obj live in both the taken and untaken
7 ; predeccessor of merge.
8 define i64 addrspace(1)* @test1(i1 %cmp, i64 addrspace(1)* %obj) gc "statepoint-example" {
11 br i1 %cmp, label %taken, label %untaken
15 ; CHECK-NEXT: gc.statepoint
16 ; CHECK-NEXT: %obj.relocated = call coldcc i64 addrspace(1)*
17 ; CHECK-NEXT: br label %merge
18 call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0)
22 ; CHECK-LABEL: untaken:
23 ; CHECK-NEXT: gc.statepoint
24 ; CHECK-NEXT: %obj.relocated1 = call coldcc i64 addrspace(1)*
25 ; CHECK-NEXT: br label %merge
26 call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0)
31 ; CHECK-NEXT: %.0 = phi i64 addrspace(1)* [ %obj.relocated, %taken ], [ %obj.relocated1, %untaken ]
32 ; CHECK-NEXT: ret i64 addrspace(1)* %.0
33 ret i64 addrspace(1)* %obj
36 ; A local kill should not effect liveness in predecessor block
37 define i64 addrspace(1)* @test2(i1 %cmp, i64 addrspace(1)** %loc) gc "statepoint-example" {
41 ; CHECK-NEXT: gc.statepoint
43 call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0)
44 br i1 %cmp, label %taken, label %untaken
48 ; CHECK-NEXT: %obj = load
49 ; CHECK-NEXT: gc.statepoint
50 ; CHECK-NEXT: gc.relocate
51 ; CHECK-NEXT: ret i64 addrspace(1)* %obj.relocated
53 %obj = load i64 addrspace(1)*, i64 addrspace(1)** %loc
54 call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0)
55 ret i64 addrspace(1)* %obj
58 ret i64 addrspace(1)* null
61 ; A local kill should effect values live from a successor phi. Also, we
62 ; should only propagate liveness from a phi to the appropriate predecessors.
63 define i64 addrspace(1)* @test3(i1 %cmp, i64 addrspace(1)** %loc) gc "statepoint-example" {
66 br i1 %cmp, label %taken, label %untaken
70 ; CHECK-NEXT: gc.statepoint
71 ; CHECK-NEXT: %obj = load
72 ; CHECK-NEXT: gc.statepoint
73 ; CHECK-NEXT: %obj.relocated = call coldcc i64 addrspace(1)*
74 ; CHECK-NEXT: br label %merge
75 call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0)
76 %obj = load i64 addrspace(1)*, i64 addrspace(1)** %loc
77 call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0)
82 ; CHECK-NEXT: gc.statepoint
83 ; CHECK-NEXT: br label %merge
84 call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0)
88 %phi = phi i64 addrspace(1)* [ %obj, %taken ], [ null, %untaken ]
89 ret i64 addrspace(1)* %phi
92 ; A base pointer must be live if it is needed at a later statepoint,
93 ; even if the base pointer is otherwise unused.
94 define i64 addrspace(1)* @test4(i1 %cmp, i64 addrspace(1)* %obj) gc "statepoint-example" {
98 ; CHECK-NEXT: %derived = getelementptr
99 ; CHECK-NEXT: gc.statepoint
100 ; CHECK-NEXT: %derived.relocated =
101 ; CHECK-NEXT: %obj.relocated =
102 ; CHECK-NEXT: gc.statepoint
103 ; CHECK-NEXT: %derived.relocated1 =
104 ; Note: It's legal to relocate obj again, but not strictly needed
105 ; CHECK-NEXT: %obj.relocated2 =
106 ; CHECK-NEXT: ret i64 addrspace(1)* %derived.relocated1
108 %derived = getelementptr i64, i64 addrspace(1)* %obj, i64 8
109 call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0)
111 call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0)
112 ret i64 addrspace(1)* %derived
115 declare void @consume(...) readonly
117 ; Make sure that a phi def visited during iteration is considered a kill.
118 ; Also, liveness after base pointer analysis can change based on new uses,
120 define i64 addrspace(1)* @test5(i1 %cmp, i64 addrspace(1)* %obj) gc "statepoint-example" {
121 ; CHECK-LABEL: @test5
123 br i1 %cmp, label %taken, label %untaken
126 ; CHECK-LABEL: taken:
127 ; CHECK-NEXT: gc.statepoint
128 ; CHECK-NEXT: %obj.relocated = call coldcc i64 addrspace(1)*
129 ; CHECK-NEXT: br label %merge
130 call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0)
134 ; CHECK-LABEL: untaken:
135 ; CHECK-NEXT: br label %merge
139 ; CHECK-LABEL: merge:
140 ; CHECK-NEXT: %.0 = phi i64 addrspace(1)*
141 ; CHECK-NEXT: %obj2a = phi
142 ; CHECK-NEXT: @consume
143 ; CHECK-NEXT: br label %final
144 %obj2a = phi i64 addrspace(1)* [ %obj, %taken ], [null, %untaken]
145 call void (...)* @consume(i64 addrspace(1)* %obj2a)
148 ; CHECK-LABEL: final:
149 ; CHECK-NEXT: @consume
150 ; CHECK-NEXT: ret i64 addrspace(1)* %.0
151 call void (...)* @consume(i64 addrspace(1)* %obj2a)
152 ret i64 addrspace(1)* %obj
157 declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()*, i32, i32, ...)