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c2330deaf3
While this doesn't appear to help with the perf issue being exposed by D84108, the function as-is is very weird, convoluted, and what's worse, recursive. There was no need for `SpeculativelyAvaliableAndUsedForSpeculation`, tri-state choice is enough. We don't even ever check for that state. The basic idea here is that we need to perform a depth-first traversal of the predecessors of the basic block in question, either finding a preexisting state for the block in a map, or inserting a "placeholder" `SpeculativelyAvaliable`, If we encounter an `Unavaliable` block, then we need to give up search, and back-propagate the `Unavaliable` state to the each successor of said block, more specifically to the each `SpeculativelyAvaliable` we've just created. However, if we have traversed entirety of the predecessors and have not encountered an `Unavaliable` block, then it must mean the value is fully available. We could update each inserted `SpeculativelyAvaliable` into a `Avaliable`, but we don't need to, as assertion excersizes, because we can assume that if we see an `SpeculativelyAvaliable` entry, it is actually `Avaliable`, because during the time we've produced it, if we would have found that it has an `Unavaliable` predecessor, we would have updated it's successors, including this block, into `Unavaliable` Reviewed By: fhahn Differential Revision: https://reviews.llvm.org/D84181 |
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| .. | ||
| PRE | ||
| 2007-07-25-DominatedLoop.ll | ||
| 2007-07-25-InfiniteLoop.ll | ||
| 2007-07-25-Loop.ll | ||
| 2007-07-25-NestedLoop.ll | ||
| 2007-07-25-SinglePredecessor.ll | ||
| 2007-07-26-InterlockingLoops.ll | ||
| 2007-07-26-NonRedundant.ll | ||
| 2007-07-26-PhiErasure.ll | ||
| 2007-07-30-PredIDom.ll | ||
| 2007-07-31-NoDomInherit.ll | ||
| 2007-07-31-RedundantPhi.ll | ||
| 2008-02-12-UndefLoad.ll | ||
| 2008-02-13-NewPHI.ll | ||
| 2008-07-02-Unreachable.ll | ||
| 2008-12-09-SelfRemove.ll | ||
| 2008-12-12-RLE-Crash.ll | ||
| 2008-12-14-rle-reanalyze.ll | ||
| 2008-12-15-CacheVisited.ll | ||
| 2009-01-21-SortInvalidation.ll | ||
| 2009-01-22-SortInvalidation.ll | ||
| 2009-03-10-PREOnVoid.ll | ||
| 2009-07-13-MemDepSortFail.ll | ||
| 2009-11-12-MemDepMallocBitCast.ll | ||
| 2010-03-31-RedundantPHIs.ll | ||
| 2010-05-08-OneBit.ll | ||
| 2010-11-13-Simplify.ll | ||
| 2011-04-27-phioperands.ll | ||
| 2011-07-07-MatchIntrinsicExtract.ll | ||
| 2011-09-07-TypeIdFor.ll | ||
| 2012-05-22-PreCrash.ll | ||
| 2016-08-30-MaskedScatterGather.ll | ||
| addrspacecast.ll | ||
| assume-equal.ll | ||
| basic-undef-test.ll | ||
| basic.ll | ||
| big-endian.ll | ||
| bitcast-of-call.ll | ||
| br-identical.ll | ||
| callbr-loadpre-critedge.ll | ||
| callbr-scalarpre-critedge.ll | ||
| calloc-load-removal.ll | ||
| calls-nonlocal.ll | ||
| calls-readonly.ll | ||
| commute.ll | ||
| cond_br2.ll | ||
| cond_br.ll | ||
| condprop.ll | ||
| constexpr-vector-constainsundef-crash.ll | ||
| crash-no-aa.ll | ||
| crash.ll | ||
| critical-edge-split-indbr-pred-in-loop.ll | ||
| dbg-redundant-load.ll | ||
| debugloc.ll | ||
| edge.ll | ||
| equality-assume.ll | ||
| fence.ll | ||
| flags.ll | ||
| fold-const-expr.ll | ||
| fpmath.ll | ||
| freeze.ll | ||
| funclet.ll | ||
| int_sideeffect.ll | ||
| invariant.group.ll | ||
| invariant.start.ll | ||
| lifetime-simple.ll | ||
| load-constant-mem.ll | ||
| load-from-unreachable-predecessor.ll | ||
| loadpre-missed-opportunity.ll | ||
| malloc-load-removal.ll | ||
| MemdepMiscompile.ll | ||
| no_speculative_loads_with_asan.ll | ||
| no-mem-dep-info.ll | ||
| noalias.ll | ||
| non-integral-pointers.ll | ||
| non-local-offset.ll | ||
| nonescaping-malloc.ll | ||
| null-aliases-nothing.ll | ||
| opt-remarks.ll | ||
| phi-translate-partial-alias.ll | ||
| pr10820.ll | ||
| pr12979.ll | ||
| pr14166.ll | ||
| pr17732.ll | ||
| pr17852.ll | ||
| pr24397.ll | ||
| pr24426.ll | ||
| pr25440.ll | ||
| pr28562.ll | ||
| pr28879.ll | ||
| pr32314.ll | ||
| pr34908.ll | ||
| pr36063.ll | ||
| pr42605.ll | ||
| pr46054-md-nonlocaldefcache-cleanup.ll | ||
| pre-compare.ll | ||
| pre-new-inst.ll | ||
| preserve-analysis.ll | ||
| propagate-ir-flags.ll | ||
| range.ll | ||
| readattrs.ll | ||
| rle-must-alias.ll | ||
| rle-no-phi-translate.ll | ||
| rle-nonlocal.ll | ||
| stale-loop-info.ll | ||
| tbaa.ll | ||
| unreachable_block_infinite_loop.ll | ||
| unreachable-predecessor.ll | ||
| volatile-nonvolatile.ll | ||
| vscale.ll | ||