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Recommit "[GlobalOpt] Pass DTU to removeUnreachableBlocks instead of recomputing." 

The cause for the revert should be fixed by r373513 /
a80b6c1542

This reverts commit 47dbcbd8ec.

llvm-svn: 373522
This commit is contained in:
Florian Hahn 2019-10-02 20:40:13 +00:00
parent 5a8b229c97
commit a03d7b0f24
1 changed files with 3 additions and 7 deletions
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10
llvm/lib/Transforms/IPO/GlobalOpt.cpp
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@ -2285,14 +2285,10 @@ OptimizeFunctions(Module &M,
// So, remove unreachable blocks from the function, because a) there's
// no point in analyzing them and b) GlobalOpt should otherwise grow
// some more complicated logic to break these cycles.
// Removing unreachable blocks might invalidate the dominator so we
// recalculate it.
if (!F->isDeclaration()) {
if (removeUnreachableBlocks(*F)) {
auto &DT = LookupDomTree(*F);
DT.recalculate(*F);
Changed = true;
}
auto &DT = LookupDomTree(*F);
DomTreeUpdater DTU(DT, DomTreeUpdater::UpdateStrategy::Lazy);
Changed |= removeUnreachableBlocks(*F, &DTU);
}
Changed |= processGlobal(*F, GetTLI, LookupDomTree);