From 0686d1ae4170c0656f24d5971750beddd7d781ae Mon Sep 17 00:00:00 2001
From: Max Kazantsev <max.kazantsev@azul.com>
Date: Tue, 12 Feb 2019 06:14:27 +0000
Subject: [NFC] Add parameter for keeping one-input Phis in DeleteDeadBlock(s)

llvm-svn: 353799
---
 llvm/lib/Transforms/Utils/BasicBlockUtils.cpp | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

(limited to 'llvm/lib/Transforms/Utils/BasicBlockUtils.cpp')

diff --git a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
index 2410f652fd7..c0148b94cba 100644
--- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -49,13 +49,14 @@ using namespace llvm;
 
 void llvm::DetatchDeadBlocks(
     ArrayRef<BasicBlock *> BBs,
-    SmallVectorImpl<DominatorTree::UpdateType> *Updates) {
+    SmallVectorImpl<DominatorTree::UpdateType> *Updates,
+    bool DontDeleteUselessPHIs) {
   for (auto *BB : BBs) {
     // Loop through all of our successors and make sure they know that one
     // of their predecessors is going away.
     SmallPtrSet<BasicBlock *, 4> UniqueSuccessors;
     for (BasicBlock *Succ : successors(BB)) {
-      Succ->removePredecessor(BB);
+      Succ->removePredecessor(BB, DontDeleteUselessPHIs);
       if (Updates && UniqueSuccessors.insert(Succ).second)
         Updates->push_back({DominatorTree::Delete, BB, Succ});
     }
@@ -80,12 +81,13 @@ void llvm::DetatchDeadBlocks(
   }
 }
 
-void llvm::DeleteDeadBlock(BasicBlock *BB, DomTreeUpdater *DTU) {
-  DeleteDeadBlocks({BB}, DTU);
+void llvm::DeleteDeadBlock(BasicBlock *BB, DomTreeUpdater *DTU,
+                           bool DontDeleteUselessPHIs) {
+  DeleteDeadBlocks({BB}, DTU, DontDeleteUselessPHIs);
 }
 
-void llvm::DeleteDeadBlocks(ArrayRef <BasicBlock *> BBs,
-                            DomTreeUpdater *DTU) {
+void llvm::DeleteDeadBlocks(ArrayRef <BasicBlock *> BBs, DomTreeUpdater *DTU,
+                            bool DontDeleteUselessPHIs) {
 #ifndef NDEBUG
   // Make sure that all predecessors of each dead block is also dead.
   SmallPtrSet<BasicBlock *, 4> Dead(BBs.begin(), BBs.end());
@@ -96,7 +98,7 @@ void llvm::DeleteDeadBlocks(ArrayRef <BasicBlock *> BBs,
 #endif
 
   SmallVector<DominatorTree::UpdateType, 4> Updates;
-  DetatchDeadBlocks(BBs, DTU ? &Updates : nullptr);
+  DetatchDeadBlocks(BBs, DTU ? &Updates : nullptr, DontDeleteUselessPHIs);
 
   if (DTU)
     DTU->applyUpdates(Updates, /*ForceRemoveDuplicates*/ true);
-- 
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