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Remove special-casing of return blocks for liveness.

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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
This commit is contained in:
Jakob Stoklund Olesen
2013-02-05 18:21:52 +00:00
parent baa3c50a7b
commit b45e4deb10
6 changed files with 7 additions and 142 deletions
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lib/CodeGen/CriticalAntiDepBreaker.cpp
+1 -17
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@@ -57,23 +57,7 @@ void CriticalAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
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(),