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
21 lines
900 B
LLVM
21 lines
900 B
LLVM
; RUN: opt %s -rewrite-statepoints-for-gc -spp-print-base-pointers -S 2>&1 | FileCheck %s
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; CHECK: derived %next base %base_obj
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declare i1 @runtime_value()
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define void @maybe_GEP(i64 addrspace(1)* %base_obj) gc "statepoint-example" {
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entry:
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br label %loop
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loop:
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%current = phi i64 addrspace(1)* [ %base_obj, %entry ], [ %next, %loop ]
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%condition = call i1 @runtime_value()
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%maybe_next = getelementptr i64, i64 addrspace(1)* %current, i32 1
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%next = select i1 %condition, i64 addrspace(1)* %maybe_next, i64 addrspace(1)* %current
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%safepoint_token = call token (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)
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br label %loop
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}
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declare void @do_safepoint()
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declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...) |