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98 lines
3.1 KiB
LLVM
98 lines
3.1 KiB
LLVM
; RUN: opt -S -rewrite-statepoints-for-gc < %s | FileCheck %s
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; constants don't get relocated.
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@G = addrspace(1) global i8 5
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declare void @foo()
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define i8 @test() gc "statepoint-example" {
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; CHECK-LABEL: @test
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; CHECK: gc.statepoint
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; CHECK-NEXT: load i8, i8 addrspace(1)* inttoptr (i64 15 to i8 addrspace(1)*)
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; Mostly just here to show reasonable code test can come from.
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entry:
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call void @foo() [ "deopt"() ]
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%res = load i8, i8 addrspace(1)* inttoptr (i64 15 to i8 addrspace(1)*)
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ret i8 %res
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}
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define i8 @test2(i8 addrspace(1)* %p) gc "statepoint-example" {
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; CHECK-LABEL: @test2
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; CHECK: gc.statepoint
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; CHECK-NEXT: gc.relocate
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; CHECK-NEXT: icmp
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; Globals don't move and thus don't get relocated
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entry:
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call void @foo() [ "deopt"() ]
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%cmp = icmp eq i8 addrspace(1)* %p, null
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br i1 %cmp, label %taken, label %not_taken
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taken: ; preds = %not_taken, %entry
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ret i8 0
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not_taken: ; preds = %entry
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%cmp2 = icmp ne i8 addrspace(1)* %p, null
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br i1 %cmp2, label %taken, label %dead
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dead: ; preds = %not_taken
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%addr = getelementptr i8, i8 addrspace(1)* %p, i32 15
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%res = load i8, i8 addrspace(1)* %addr
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ret i8 %res
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}
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define i8 @test3(i1 %always_true) gc "statepoint-example" {
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; CHECK-LABEL: @test3
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; CHECK: gc.statepoint
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; CHECK-NEXT: load i8, i8 addrspace(1)* @G
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entry:
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call void @foo() [ "deopt"() ]
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%res = load i8, i8 addrspace(1)* @G, align 1
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ret i8 %res
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}
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; Even for source languages without constant references, we can
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; see constants can show up along paths where the value is dead.
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; This is particular relevant when computing bases of PHIs.
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define i8 addrspace(1)* @test4(i8 addrspace(1)* %p) gc "statepoint-example" {
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; CHECK-LABEL: @test4
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entry:
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%is_null = icmp eq i8 addrspace(1)* %p, null
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br i1 %is_null, label %split, label %join
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split:
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call void @foo()
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%arg_value_addr.i = getelementptr inbounds i8, i8 addrspace(1)* %p, i64 8
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%arg_value_addr_casted.i = bitcast i8 addrspace(1)* %arg_value_addr.i to i8 addrspace(1)* addrspace(1)*
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br label %join
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join:
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; CHECK-LABEL: join
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; CHECK: %addr2.base =
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%addr2 = phi i8 addrspace(1)* addrspace(1)* [ %arg_value_addr_casted.i, %split ], [ inttoptr (i64 8 to i8 addrspace(1)* addrspace(1)*), %entry ]
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;; NOTE: This particular example can be jump-threaded, but in general,
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;; we can't, and have to deal with the resulting IR.
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br i1 %is_null, label %early-exit, label %use
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early-exit:
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ret i8 addrspace(1)* null
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use:
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; CHECK-LABEL: use:
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; CHECK: gc.statepoint
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; CHECK: gc.relocate
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call void @foo()
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%res = load i8 addrspace(1)*, i8 addrspace(1)* addrspace(1)* %addr2, align 1
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ret i8 addrspace(1)* %res
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}
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; Globals don't move and thus don't get relocated
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define i8 addrspace(1)* @test5(i1 %always_true) gc "statepoint-example" {
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; CHECK-LABEL: @test5
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; CHECK: gc.statepoint
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; CHECK-NEXT: %res = extractelement <2 x i8 addrspace(1)*> <i8 addrspace(1)* @G, i8 addrspace(1)* @G>, i32 0
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entry:
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call void @foo()
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%res = extractelement <2 x i8 addrspace(1)*> <i8 addrspace(1)* @G, i8 addrspace(1)* @G>, i32 0
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ret i8 addrspace(1)* %res
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}
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