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/CriticalAntiDepBreaker.cpp b/lib/CodeGen/CriticalAntiDepBreaker.cpp
index ee31dde..0eb74a4 100644
--- a/lib/CodeGen/CriticalAntiDepBreaker.cpp
+++ b/lib/CodeGen/CriticalAntiDepBreaker.cpp
@@ -57,23 +57,7 @@
bool IsReturnBlock = (BBSize != 0 && BB->back().isReturn());
- // 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;
- Classes[Reg] = reinterpret_cast<TargetRegisterClass *>(-1);
- KillIndices[Reg] = BBSize;
- 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(),