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Differential D64183 Diff 219578 llvm/lib/CodeGen/MachineBlockPlacement.cpp

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llvm/lib/CodeGen/MachineBlockPlacement.cpp

Show First 20 Lines • Show All 3,032 Lines • ▼ Show 20 Lines bool EnableTailMerge = !MF.getTarget().requiresStructuredCFG() &&
PassConfig->getEnableTailMerge() && PassConfig->getEnableTailMerge() &&
BranchFoldPlacement; BranchFoldPlacement;
// No tail merging opportunities if the block number is less than four. // No tail merging opportunities if the block number is less than four.
if (MF.size() > 3 && EnableTailMerge) { if (MF.size() > 3 && EnableTailMerge) {
unsigned TailMergeSize = TailDupSize + 1; unsigned TailMergeSize = TailDupSize + 1;
BranchFolder BF(/*EnableTailMerge=*/true, /*CommonHoist=*/false, *MBFI, BranchFolder BF(/*EnableTailMerge=*/true, /*CommonHoist=*/false, *MBFI,
*MBPI, TailMergeSize); *MBPI, TailMergeSize);
auto *MMIWP = getAnalysisIfAvailable<MachineModuleInfoWrapperPass>();
if (BF.OptimizeFunction(MF, TII, MF.getSubtarget().getRegisterInfo(), if (BF.OptimizeFunction(MF, TII, MF.getSubtarget().getRegisterInfo(),
getAnalysisIfAvailable<MachineModuleInfo>(), MLI, MMIWP ? &MMIWP->getMMI() : nullptr, MLI,
/*AfterPlacement=*/true)) { /*AfterPlacement=*/true)) {
// Redo the layout if tail merging creates/removes/moves blocks. // Redo the layout if tail merging creates/removes/moves blocks.
BlockToChain.clear(); BlockToChain.clear();
arsenmUnsubmitted
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ComputedEdges.clear(); ComputedEdges.clear();
// Must redo the post-dominator tree if blocks were changed. // Must redo the post-dominator tree if blocks were changed.
if (MPDT) if (MPDT)
MPDT->runOnMachineFunction(MF); MPDT->runOnMachineFunction(MF);
ChainAllocator.DestroyAll(); ChainAllocator.DestroyAll();
buildCFGChains(); buildCFGChains();
} }
} }
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