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Revert r114919, which caused some serious regressions on ARM. 

llvm-svn: 115053
This commit is contained in:
Owen Anderson 2010-09-29 18:05:19 +00:00
parent 2e566e040a
commit d67ca0ed4c
1 changed files with 1 additions and 6 deletions
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7
llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
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@ -158,12 +158,7 @@ bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
DEBUG(dbgs() << " Not unrolling loop with inlinable calls.\n"); DEBUG(dbgs() << " Not unrolling loop with inlinable calls.\n");
return false; return false;
} }
uint64_t Size = (uint64_t)LoopSize*Count;
// NOTE: We multiply by the loop depth because unrolling inner loops of
// very deep nests tends to result in high register pressure, which we don't
// currently recover from very well. When and if the register allocator/
// spiller improves to compensate, this should be re-evaluated.
uint64_t Size = (uint64_t)LoopSize*Count*L->getLoopDepth();
if (TripCount != 1 && Size > CurrentThreshold) { if (TripCount != 1 && Size > CurrentThreshold) {
DEBUG(dbgs() << " Too large to fully unroll with count: " << Count DEBUG(dbgs() << " Too large to fully unroll with count: " << Count
<< " because size: " << Size << ">" << CurrentThreshold << "\n"); << " because size: " << Size << ">" << CurrentThreshold << "\n");