[PATCH] D43931: [LoopUnroll] Ignore ephemeral values when checking full unroll profitability.
Andrei Elovikov via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Mar 1 01:59:10 PST 2018
a.elovikov created this revision.
a.elovikov added reviewers: mzolotukhin, evstupac, sanjoy.
Before this patch call graph is like this in the LoopUnrollPass:
tryToUnrollLoop
ApproximateLoopSize
collectEphemeralValues
/* Use collected ephemeral values */
computeUnrollCount
analyzeLoopUnrollCost
/* Bail out from the analysis if loop contains CallInst */
This patch moves collection of the ephemeral values to the tryToUnrollLoop
function and passes the collected values into both ApproximateLoopsize (as
before) and additionally starts using them in analyzeLoopUnrollCost:
tryToUnrollLoop
collectEphemeralValues
ApproximateLoopSize(EphValues)
/* Use EphValues */
computeUnrollCount(EphValues)
analyzeLoopUnrollCost(EphValues)
/* Ignore ephemeral values - they don't contribute to the final cost */
/* Bail out from the analysis if loop contains CallInst */
Repository:
rL LLVM
https://reviews.llvm.org/D43931
Files:
lib/Transforms/Scalar/LoopUnrollPass.cpp
test/Transforms/LoopUnroll/complete_unroll_profitability_with_assume.ll
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