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[CodeLayout] Do not rebuild chains with -apply-ext-tsp-for-size #115934

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Merged
merged 1 commit into from
Nov 18, 2024
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[CodeLayout] Do not rebuild chains with -apply-ext-tsp-for-size #115934

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12 changes: 7 additions & 5 deletions llvm/lib/CodeGen/MachineBlockPlacement.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3558,14 +3558,16 @@ bool MachineBlockPlacement::runOnMachineFunction(MachineFunction &MF) {

if (BF.OptimizeFunction(MF, TII, MF.getSubtarget().getRegisterInfo(), MLI,
/*AfterPlacement=*/true)) {
// Redo the layout if tail merging creates/removes/moves blocks.
BlockToChain.clear();
ComputedEdges.clear();
// Must redo the post-dominator tree if blocks were changed.
if (MPDT)
MPDT->recalculate(MF);
ChainAllocator.DestroyAll();
buildCFGChains();
if (!UseExtTspForSize) {
// Redo the layout if tail merging creates/removes/moves blocks.
BlockToChain.clear();
ComputedEdges.clear();
ChainAllocator.DestroyAll();
buildCFGChains();
}
}
}

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