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A couple style tweaks on top of 5c0d1b2f9 [nfc]

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This commit is contained in:
Philip Reames 2021-06-03 14:14:59 -07:00
parent 8c571feefd
commit 821fed9ea6
1 changed files with 7 additions and 3 deletions
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10
lib/Transforms/Utils/LoopUnroll.cpp
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@ -411,6 +411,10 @@ LoopUnrollResult llvm::UnrollLoop(Loop *L, UnrollLoopOptions ULO, LoopInfo *LI,
dbgs() << " No single exiting block\n";
});
// Warning: ExactTripCount is the exact trip count for the block ending in
// ExitingBI, not neccessarily an exact exit count *for the loop*. The
// distinction comes when we have an exiting latch, but the loop exits
// through another exit first.
const unsigned ExactTripCount = ExitingBI ?
SE->getSmallConstantTripCount(L,ExitingBI->getParent()) : 0;
const bool ExactUnroll = (ExactTripCount && ExactTripCount == ULO.Count);
@ -762,13 +766,13 @@ LoopUnrollResult llvm::UnrollLoop(Loop *L, UnrollLoopOptions ULO, LoopInfo *LI,
return None;
return j == 0;
}
if (ExactUnroll)
return j == 0;
// Full, but non-exact unrolling
// Complete (but possibly inexact) unrolling
if (j == 0)
return true;
if (MaxTripCount && j >= MaxTripCount)
return false;
// Warning: ExactTripCount is the trip count of the exiting
// block which ends in ExitingBI, not neccessarily the loop.
if (ExactTripCount && j != ExactTripCount)
return false;
return None;