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| author | Florian Hahn <flo@fhahn.com> | 2024-08-21 08:28:52 +0100 |
|---|---|---|
| committer | Florian Hahn <flo@fhahn.com> | 2024-08-21 08:28:52 +0100 |
| commit | d7c84d7b71fc5ea89b87480ff5d727496288799c (patch) | |
| tree | 11ce65abea2edd02ae0a1c6adc130fd9091ef900 /llvm/lib/Analysis/LoopAccessAnalysis.cpp | |
| parent | 89b1468345a74d2095616a8be2306cf0b08fa43a (diff) | |
| download | llvm-d7c84d7b71fc5ea89b87480ff5d727496288799c.zip llvm-d7c84d7b71fc5ea89b87480ff5d727496288799c.tar.gz llvm-d7c84d7b71fc5ea89b87480ff5d727496288799c.tar.bz2 | |
[LAA] Collect loop guards only once in MemoryDepChecker (NFCI).
This on its own gives small compile-time improvements in some configs
and enables using loop guards at more places in the future while keeping
compile-time impact low.
https://llvm-compile-time-tracker.com/compare.php?from=c44202574ff9a8c0632aba30c2765b134557435f&to=55ffc3dd920fa9af439fd39f8f9cc13509531420&stat=instructions:u
Diffstat (limited to 'llvm/lib/Analysis/LoopAccessAnalysis.cpp')
| -rw-r--r-- | llvm/lib/Analysis/LoopAccessAnalysis.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/llvm/lib/Analysis/LoopAccessAnalysis.cpp b/llvm/lib/Analysis/LoopAccessAnalysis.cpp index 872bc52..980f142 100644 --- a/llvm/lib/Analysis/LoopAccessAnalysis.cpp +++ b/llvm/lib/Analysis/LoopAccessAnalysis.cpp @@ -2054,8 +2054,12 @@ MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx, LLVM_DEBUG(dbgs() << "LAA: Strided accesses are independent\n"); return Dependence::NoDep; } - } else - Dist = SE.applyLoopGuards(Dist, InnermostLoop); + } else { + if (!LoopGuards) + LoopGuards.emplace( + ScalarEvolution::LoopGuards::collect(InnermostLoop, SE)); + Dist = SE.applyLoopGuards(Dist, *LoopGuards); + } // Negative distances are not plausible dependencies. if (SE.isKnownNonPositive(Dist)) { |