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Summary: RewriteStatepointsForGC collects parse points for further processing. During the collection if a callsite is found in an unreachable block (DominatorTree::isReachableFromEntry()) then all unreachable blocks are removed by removeUnreachableBlocks(). Some of the removed blocks could have been reachable according to DominatorTree::isReachableFromEntry(). In this case the collected parse points became stale and resulted in a crash when accessed. The fix is to unconditionally canonicalize the IR to removeUnreachableBlocks and then collect the parse points. The added test crashes with the old version and passes with this patch. Patch by Yevgeny Rouban! Reviewed by: Anna Differential Revision: https://reviews.llvm.org/D43929 llvm-svn: 326748
30 lines
1.1 KiB
LLVM
30 lines
1.1 KiB
LLVM
; RUN: opt -S -rewrite-statepoints-for-gc < %s | FileCheck %s
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; RUN: opt -S -passes=rewrite-statepoints-for-gc < %s | FileCheck %s
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;
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; A test to make sure that we can look through bitcasts of
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; vector types when a base pointer is contained in a vector.
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:1"
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target triple = "x86_64-unknown-linux-gnu"
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declare i8 addrspace(1)* @foo()
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; Function Attrs: uwtable
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define i32 @test() gc "statepoint-example" {
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; CHECK-LABEL: @test
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entry:
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; CHECK-LABEL: entry
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; CHECK: %bc = bitcast
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; CHECK: %[[p1:[A-Za-z0-9_]+]] = extractelement
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; CHECK: %[[p2:[A-Za-z0-9_]+]] = extractelement
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; CHECK: llvm.experimental.gc.statepoint
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; CHECK: %[[p2]].relocated = {{.+}} @llvm.experimental.gc.relocate
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; CHECK: %[[p1]].relocated = {{.+}} @llvm.experimental.gc.relocate
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; CHECK: load atomic
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%bc = bitcast <8 x i8 addrspace(1)*> undef to <8 x i32 addrspace(1)*>
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%ptr= extractelement <8 x i32 addrspace(1)*> %bc, i32 7
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%0 = call i8 addrspace(1)* @foo() [ "deopt"() ]
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%1 = load atomic i32, i32 addrspace(1)* %ptr unordered, align 4
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ret i32 %1
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}
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