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; RUN: opt -S -rewrite-statepoints-for-gc < %s | FileCheck %s
; 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(i8 addrspace(1)* %obj)

define void @test(i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK-LABEL: test(
 call void @f(i8 addrspace(1)* %arg) #1
 br i1 true, label %not_zero, label %zero

 ret void

; This block is reachable but removed by removeUnreachableBlocks()
 call void @f(i8 addrspace(1)* %arg) #1
 ret void

 call void @f(i8 addrspace(1)* %arg) #1
 ret void

attributes #1 = { norecurse noimplicitfloat }