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restructure the top level non-local ptr dep query to handle
the first block of a query specially. This makes the "complete query caching" subsystem more effective, avoiding predecessor queries. This speeds up GVN another 4%. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60752 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -490,13 +490,9 @@ getNonLocalPointerDependency(Value *Pointer, bool isLoad, BasicBlock *FromBB,
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// While we have blocks to analyze, get their values.
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SmallPtrSet<BasicBlock*, 64> Visited;
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for (BasicBlock **PI = PredCache->GetPreds(FromBB); *PI; ++PI) {
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// TODO: PHI TRANSLATE.
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getNonLocalPointerDepFromBB(Pointer, PointeeSize, isLoad, *PI,
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getNonLocalPointerDepFromBB(Pointer, PointeeSize, isLoad, FromBB,
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Result, Visited);
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}
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}
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/// GetNonLocalInfoForBlock - Compute the memdep value for BB with
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/// Pointer/PointeeSize using either cached information in Cache or by doing a
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@ -611,9 +607,19 @@ getNonLocalPointerDepFromBB(Value *Pointer, uint64_t PointeeSize,
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// revisit blocks after we insert info for them.
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unsigned NumSortedEntries = Cache->size();
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// SkipFirstBlock - If this is the very first block that we're processing, we
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// don't want to skip or thing about its body, because the client was supposed
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// to do a local dependence query. Instead, just start processing it by
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// adding its predecessors to the worklist and iterating.
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bool SkipFirstBlock = Visited.empty();
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while (!Worklist.empty()) {
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BasicBlock *BB = Worklist.pop_back_val();
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// Skip the first block if we have it.
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if (SkipFirstBlock) {
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SkipFirstBlock = false;
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} else {
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// Analyze the dependency of *Pointer in FromBB. See if we already have
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// been here.
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if (!Visited.insert(BB))
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@ -629,6 +635,7 @@ getNonLocalPointerDepFromBB(Value *Pointer, uint64_t PointeeSize,
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Result.push_back(NonLocalDepEntry(BB, Dep));
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continue;
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}
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}
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// Otherwise, we have to process all the predecessors of this block to scan
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// them as well.
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