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[SimplifyCFG] simplifySingleResume(): FoldReturnIntoUncondBranch() already knows how to preserve DomTree

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... so just ensure that we pass DomTreeUpdater it into it.

Apparently, there were no dedicated tests just for that functionality,
so i'm adding one here.
This commit is contained in:
Roman Lebedev 2020-12-19 18:09:10 +03:00
parent a314860e9c
commit 8e036d3e3a
2 changed files with 36 additions and 2 deletions
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5
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -4424,7 +4424,7 @@ bool SimplifyCFGOpt::simplifyReturn(ReturnInst *RI, IRBuilder<> &Builder) {
BasicBlock *Pred = UncondBranchPreds.pop_back_val();
LLVM_DEBUG(dbgs() << "FOLDING: " << *BB
<< "INTO UNCOND BRANCH PRED: " << *Pred);
(void)FoldReturnIntoUncondBranch(RI, BB, Pred);
(void)FoldReturnIntoUncondBranch(RI, BB, Pred, DTU);
}
// If we eliminated all predecessors of the block, delete the block now.
@ -4432,6 +4432,9 @@ bool SimplifyCFGOpt::simplifyReturn(ReturnInst *RI, IRBuilder<> &Builder) {
// We know there are no successors, so just nuke the block.
if (LoopHeaders)
LoopHeaders->erase(BB);
if (DTU)
DTU->deleteBB(BB);
else
BB->eraseFromParent();
}

31
test/Transforms/SimplifyCFG/duplicate-ret-into-uncond-br.ll Normal file
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@ -0,0 +1,31 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -simplifycfg-dup-ret -S | FileCheck %s
declare void @bar()
declare void @baz()
define void @foo(i1 %c) {
; CHECK-LABEL: @foo(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[C:%.*]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: ret void
; CHECK: false:
; CHECK-NEXT: call void @baz()
; CHECK-NEXT: ret void
;
entry:
br i1 %c, label %true, label %false
true:
call void @bar()
br label %end
false:
call void @baz()
br label %end
end:
ret void
}