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Avoid a bug in the path count computation, preventing an infinite
loop repeatedlt making the same change. This is for rdar://11256239. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155160 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -3379,7 +3379,7 @@ ObjCARCOpt::PerformCodePlacement(DenseMap<const BasicBlock *, BBState>
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// Ok, everything checks out and we're all set. Let's move some code!
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Changed = true;
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AnyPairsCompletelyEliminated = NewCount == 0;
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AnyPairsCompletelyEliminated = OldCount != 0 && NewCount == 0;
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NumRRs += OldCount - NewCount;
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MoveCalls(Arg, RetainsToMove, ReleasesToMove,
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Retains, Releases, DeadInsts, M);
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48
test/Transforms/ObjCARC/split-backedge.ll
Normal file
48
test/Transforms/ObjCARC/split-backedge.ll
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@ -0,0 +1,48 @@
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; RUN: opt -S -objc-arc < %s | FileCheck %s
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; Handle a retain+release pair entirely contained within a split loop backedge.
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; rdar://11256239
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; CHECK: define void @test0
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; CHECK: call i8* @objc_retain(i8* %call) nounwind
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; CHECK: call i8* @objc_retain(i8* %call) nounwind
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; CHECK: call i8* @objc_retain(i8* %cond) nounwind
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; CHECK: call void @objc_release(i8* %call) nounwind
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; CHECK: call void @objc_release(i8* %call) nounwind
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; CHECK: call void @objc_release(i8* %cond) nounwind
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define void @test0() {
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entry:
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br label %while.body
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while.body: ; preds = %while.cond
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%call = invoke i8* @returner()
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to label %invoke.cont unwind label %lpad, !clang.arc.no_objc_arc_exceptions !0
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invoke.cont: ; preds = %while.body
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%t0 = call i8* @objc_retain(i8* %call) nounwind
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%t1 = call i8* @objc_retain(i8* %call) nounwind
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%call.i1 = invoke i8* @returner()
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to label %invoke.cont1 unwind label %lpad
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invoke.cont1: ; preds = %invoke.cont
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%cond = select i1 undef, i8* null, i8* %call
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%t2 = call i8* @objc_retain(i8* %cond) nounwind
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call void @objc_release(i8* %call) nounwind
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call void @objc_release(i8* %call) nounwind
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call void @use_pointer(i8* %cond)
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call void @objc_release(i8* %cond) nounwind
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br label %while.body
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lpad: ; preds = %invoke.cont, %while.body
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%t4 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__objc_personality_v0 to i8*)
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catch i8* null
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ret void
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}
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declare i8* @returner()
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declare i32 @__objc_personality_v0(...)
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declare void @objc_release(i8*)
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declare i8* @objc_retain(i8*)
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declare void @use_pointer(i8*)
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!0 = metadata !{}
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