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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2014-05-04 19:12:38 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2014-05-04 19:12:38 +0000 |
| commit | 99b03e3401c303f4115258b812e1d96e20f04945 (patch) | |
| tree | 784f826d03b612470e83d2b0863d6bd49da53556 /lib/Transforms/Scalar/LoopUnrollPass.cpp | |
| parent | 28a739b4dcd88fc55adc521d2017a831ca7286c9 (diff) | |
| download | llvm-99b03e3401c303f4115258b812e1d96e20f04945.tar.gz llvm-99b03e3401c303f4115258b812e1d96e20f04945.tar.bz2 llvm-99b03e3401c303f4115258b812e1d96e20f04945.tar.xz | |
LoopUnroll: If we're doing partial unrolling, use the PartialThreshold to limit unrolling.
Otherwise we use the same threshold as for complete unrolling, which is
way too high. This made us unroll any loop smaller than 150 instructions
by 8 times, but only if someone specified -march=core2 or better,
which happens to be the default on darwin.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207940 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/LoopUnrollPass.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LoopUnrollPass.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/Transforms/Scalar/LoopUnrollPass.cpp b/lib/Transforms/Scalar/LoopUnrollPass.cpp index 3290c6ff45..fc28fd2bdc 100644 --- a/lib/Transforms/Scalar/LoopUnrollPass.cpp +++ b/lib/Transforms/Scalar/LoopUnrollPass.cpp @@ -238,9 +238,12 @@ bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) { return false; } uint64_t Size = (uint64_t)LoopSize*Count; - if (TripCount != 1 && Size > Threshold) { - DEBUG(dbgs() << " Too large to fully unroll with count: " << Count - << " because size: " << Size << ">" << Threshold << "\n"); + if (TripCount != 1 && + (Size > Threshold || (Count != TripCount && Size > PartialThreshold))) { + if (Size > Threshold) + DEBUG(dbgs() << " Too large to fully unroll with count: " << Count + << " because size: " << Size << ">" << Threshold << "\n"); + bool AllowPartial = UserAllowPartial ? CurrentAllowPartial : UP.Partial; if (!AllowPartial && !(Runtime && TripCount == 0)) { DEBUG(dbgs() << " will not try to unroll partially because " |