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-rw-r--r--llvm/lib/CodeGen/MachineBlockPlacement.cpp26
1 files changed, 0 insertions, 26 deletions
diff --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index ae0f5bd..e4ddb04 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -68,13 +68,6 @@ ExitBlockBias("block-placement-exit-block-bias",
"over the original exit to be considered the new exit."),
cl::init(0), cl::Hidden);
-static cl::opt<bool> PlaceLastSuccessor(
- "place-last-successor",
- cl::desc("When selecting a non-successor block, choose the last block to "
- "have been a successor. This represents the block whose "
- "predecessor was most recently placed."),
- cl::init(false), cl::Hidden);
-
static cl::opt<bool> OutlineOptionalBranches(
"outline-optional-branches",
cl::desc("Put completely optional branches, i.e. branches with a common "
@@ -450,25 +443,6 @@ MachineBasicBlock *MachineBlockPlacement::selectBestSuccessor(
MachineBasicBlock *MachineBlockPlacement::selectBestCandidateBlock(
BlockChain &Chain, SmallVectorImpl<MachineBasicBlock *> &WorkList,
const BlockFilterSet *BlockFilter) {
- if (PlaceLastSuccessor) {
- // If we're just placing the last successor as the best candidate, the
- // logic is super simple. We skip the already placed entries on the
- // worklist and return the most recently added entry that isn't placed.
- while (!WorkList.empty()) {
- MachineBasicBlock *SuccBB = WorkList.pop_back_val();
- BlockChain &SuccChain = *BlockToChain.lookup(SuccBB);
- if (&SuccChain == &Chain) {
- DEBUG(dbgs() << " " << getBlockName(SuccBB)
- << " -> Already merged!\n");
- continue;
- }
- assert(SuccChain.LoopPredecessors == 0 && "Found CFG-violating block");
- return SuccBB;
- }
-
- return nullptr;
- }
-
// Once we need to walk the worklist looking for a candidate, cleanup the
// worklist of already placed entries.
// FIXME: If this shows up on profiles, it could be folded (at the cost of