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LoopUnroll: If we're doing partial unrolling, use the PartialThreshold to limit unrolling.

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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
This commit is contained in:
Benjamin Kramer
2014-05-04 19:12:38 +00:00
parent 28a739b4dc
commit 99b03e3401
2 changed files with 53 additions and 3 deletions
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9
lib/Transforms/Scalar/LoopUnrollPass.cpp
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@@ -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 "