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[MBP] Split placement and alignment into two functions. NFC. 

Cut and Paste.

llvm-svn: 268067
This commit is contained in:
Haicheng Wu 2016-04-29 17:06:44 +00:00
parent 38e496b175
commit e749ce53d4
1 changed files with 5 additions and 0 deletions
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5
llvm/lib/CodeGen/MachineBlockPlacement.cpp
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@ -300,6 +300,7 @@ class MachineBlockPlacement : public MachineFunctionPass {
void rotateLoopWithProfile(BlockChain &LoopChain, MachineLoop &L,
const BlockFilterSet &LoopBlockSet);
void buildCFGChains(MachineFunction &F);
void alignBlocks(MachineFunction &F);
public:
static char ID; // Pass identification, replacement for typeid
@ -1357,7 +1358,9 @@ void MachineBlockPlacement::buildCFGChains(MachineFunction &F) {
MachineBasicBlock *TBB = nullptr, *FBB = nullptr; // For AnalyzeBranch.
if (!TII->AnalyzeBranch(F.back(), TBB, FBB, Cond))
F.back().updateTerminator();
}
void MachineBlockPlacement::alignBlocks(MachineFunction &F) {
// Walk through the backedges of the function now that we have fully laid out
// the basic blocks and align the destination of each backedge. We don't rely
// exclusively on the loop info here so that we can align backedges in
@ -1366,6 +1369,7 @@ void MachineBlockPlacement::buildCFGChains(MachineFunction &F) {
// FIXME: Use Function::optForSize().
if (F.getFunction()->hasFnAttribute(Attribute::OptimizeForSize))
return;
BlockChain &FunctionChain = *BlockToChain[&F.front()];
if (FunctionChain.begin() == FunctionChain.end())
return; // Empty chain.
@ -1442,6 +1446,7 @@ bool MachineBlockPlacement::runOnMachineFunction(MachineFunction &F) {
assert(BlockToChain.empty());
buildCFGChains(F);
alignBlocks(F);
BlockToChain.clear();
ChainAllocator.DestroyAll();