d71999ef1b
Summary: This patch changes gc.statepoint intrinsic's return type to token type instead of i32 type. Using token types could prevent LLVM to merge different gc.statepoint nodes into PHI nodes and cause further problems with gc relocations. The patch also changes the way on how gc.relocate and gc.result look for their corresponding gc.statepoint on unwind path. The current implementation uses the selector value extracted from a { i8*, i32 } landingpad as a hook to find the gc.statepoint, while the patch directly uses a token type landingpad (http://reviews.llvm.org/D15405) to find the gc.statepoint.
Reviewers: sanjoy, JosephTremoulet, pgavlin, igor-laevsky, mjacob
Subscribers: reames, mjacob, sanjoy, llvm-commits
Differential Revision: http://reviews.llvm.org/D15662
llvm-svn: 256443
66 lines
2.2 KiB
LLVM
66 lines
2.2 KiB
LLVM
; RUN: opt -rewrite-statepoints-for-gc -S < %s | FileCheck %s
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declare void @consume(...)
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; Test to make sure we destroy LCSSA's single entry phi nodes before
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; running liveness
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define void @test6(i64 addrspace(1)* %obj) gc "statepoint-example" {
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; CHECK-LABEL: @test6
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entry:
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br label %next
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next:
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; CHECK-LABEL: next:
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; CHECK-NEXT: gc.statepoint
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; CHECK-NEXT: gc.relocate
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; CHECK-NEXT: bitcast
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; CHECK-NEXT: @consume(i64 addrspace(1)* %obj.relocated.casted)
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; CHECK-NEXT: @consume(i64 addrspace(1)* %obj.relocated.casted)
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%obj2 = phi i64 addrspace(1)* [ %obj, %entry ]
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call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0)
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call void (...) @consume(i64 addrspace(1)* %obj2)
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call void (...) @consume(i64 addrspace(1)* %obj)
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ret void
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}
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declare void @some_call(i64 addrspace(1)*)
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; Need to delete unreachable gc.statepoint call
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define void @test7() gc "statepoint-example" {
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; CHECK-LABEL: test7
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; CHECK-NOT: gc.statepoint
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ret void
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unreached:
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%obj = phi i64 addrspace(1)* [null, %unreached]
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call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0)
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call void (...) @consume(i64 addrspace(1)* %obj)
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br label %unreached
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}
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; Need to delete unreachable gc.statepoint invoke - tested seperately given
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; a correct implementation could only remove the instructions, not the block
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define void @test8() gc "statepoint-example" personality i32 ()* undef {
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; CHECK-LABEL: test8
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; CHECK-NOT: gc.statepoint
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ret void
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unreached:
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invoke token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0)
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to label %normal_return unwind label %exceptional_return
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normal_return: ; preds = %entry
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ret void
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exceptional_return: ; preds = %entry
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%landing_pad4 = landingpad { i8*, i32 }
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cleanup
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ret void
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}
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declare void @foo()
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; Bound the last check-not
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; CHECK-LABEL: @foo
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declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
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