bolt/deps/llvm-18.1.8/llvm/test/Transforms/RewriteStatepointsForGC/unreachable-regression.ll

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2025-02-14 19:21:04 +01:00
; RUN: opt -S -passes=rewrite-statepoints-for-gc < %s | FileCheck %s
;
; Regression test:
; After the rewritable callsite collection if any callsite was found
; in a block that was reported unreachable by DominanceTree then
; removeUnreachableBlocks() was called. But it is stronger than
; DominatorTree::isReachableFromEntry(), i.e. removeUnreachableBlocks
; can remove some blocks for which isReachableFromEntry() returns true.
; This resulted in stale pointers to the collected but removed
; callsites. Such stale pointers caused crash when accessed.
declare void @f(ptr addrspace(1) %obj)
define void @test(ptr addrspace(1) %arg) gc "statepoint-example" {
; CHECK-LABEL: test(
; CHECK-NEXT: @f
call void @f(ptr addrspace(1) %arg) #1
br i1 true, label %not_zero, label %zero
not_zero:
ret void
; This block is reachable but removed by removeUnreachableBlocks()
zero:
; CHECK-NOT: @f
call void @f(ptr addrspace(1) %arg) #1
ret void
unreach:
call void @f(ptr addrspace(1) %arg) #1
ret void
}
attributes #1 = { norecurse noimplicitfloat }