Remove the nasty LABEL hack with a much less evil one. Now llvm.dbg.func.start implies a stoppoint is set. SelectionDAGISel records a new source line but does not create a ISD::LABEL node for this special stoppoint. Asm printer will magically print this label. This ensures nothing is emitted before.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46635 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
index aad1f87..3ecd623 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
@@ -711,28 +711,7 @@
}
}
- // Now that we have emitted all operands, emit this instruction itself.
- if (ISD::isDebugLabel(Node) &&
- !BB->empty() && &MF->front() == BB) {
- // If we are inserting a debug label and this happens to be the first
- // debug label in the entry block, it is the "function start" label.
- // Make sure there are no other instructions before it.
- unsigned NumLabels = 0;
- MachineBasicBlock::iterator MBBI = BB->begin();
- while (MBBI != BB->end()) {
- // FIXME: This is a nasty short term workaround. For now, we are
- // assuming there are two debug labels at the beginning of the
- // entry block: one for dbg_func_start, one for the first
- // dbg_stoppoint before actual code.
- if (!MBBI->isDebugLabel() || ++NumLabels > 1)
- break;
- ++MBBI;
- }
- if (NumLabels <= 1)
- BB->insert(BB->begin(), MI);
- else
- BB->push_back(MI);
- } else if (II.usesCustomDAGSchedInsertionHook())
+ if (II.usesCustomDAGSchedInsertionHook())
// Insert this instruction into the basic block using a target
// specific inserter which may returns a new basic block.
BB = DAG.getTargetLoweringInfo().EmitInstrWithCustomInserter(MI, BB);