Remove special-casing of return blocks for liveness.
Now that return value registers are return instruction uses, there is no
need for special treatment of return blocks.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174416 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AggressiveAntiDepBreaker.cpp b/lib/CodeGen/AggressiveAntiDepBreaker.cpp
index 152d9fa..c50f8b5 100644
--- a/lib/CodeGen/AggressiveAntiDepBreaker.cpp
+++ b/lib/CodeGen/AggressiveAntiDepBreaker.cpp
@@ -151,23 +151,7 @@
std::vector<unsigned> &KillIndices = State->GetKillIndices();
std::vector<unsigned> &DefIndices = State->GetDefIndices();
- // Determine the live-out physregs for this block.
- if (IsReturnBlock) {
- // In a return block, examine the function live-out regs.
- for (MachineRegisterInfo::liveout_iterator I = MRI.liveout_begin(),
- E = MRI.liveout_end(); I != E; ++I) {
- for (MCRegAliasIterator AI(*I, TRI, true); AI.isValid(); ++AI) {
- unsigned Reg = *AI;
- State->UnionGroups(Reg, 0);
- KillIndices[Reg] = BB->size();
- DefIndices[Reg] = ~0u;
- }
- }
- }
-
- // In a non-return block, examine the live-in regs of all successors.
- // Note a return block can have successors if the return instruction is
- // predicated.
+ // Examine the live-in regs of all successors.
for (MachineBasicBlock::succ_iterator SI = BB->succ_begin(),
SE = BB->succ_end(); SI != SE; ++SI)
for (MachineBasicBlock::livein_iterator I = (*SI)->livein_begin(),