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author | Owen Anderson <resistor@mac.com> | 2010-09-29 18:05:19 +0000 |
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committer | Owen Anderson <resistor@mac.com> | 2010-09-29 18:05:19 +0000 |
commit | 69daca59fff6c1275a52eb7d32948a88200a1807 (patch) | |
tree | cf3b5cb98b6ca53db9bd91f148d0fcda33ce375f /lib/Transforms/Scalar/LoopUnrollPass.cpp | |
parent | 1619beb4e2edb69aeb78cd2338a00dc201974f89 (diff) | |
download | external_llvm-69daca59fff6c1275a52eb7d32948a88200a1807.zip external_llvm-69daca59fff6c1275a52eb7d32948a88200a1807.tar.gz external_llvm-69daca59fff6c1275a52eb7d32948a88200a1807.tar.bz2 |
Revert r114919, which caused some serious regressions on ARM.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115053 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/LoopUnrollPass.cpp')
-rw-r--r-- | lib/Transforms/Scalar/LoopUnrollPass.cpp | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/lib/Transforms/Scalar/LoopUnrollPass.cpp b/lib/Transforms/Scalar/LoopUnrollPass.cpp index 99a38b1..7da2b52 100644 --- a/lib/Transforms/Scalar/LoopUnrollPass.cpp +++ b/lib/Transforms/Scalar/LoopUnrollPass.cpp @@ -158,12 +158,7 @@ bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) { DEBUG(dbgs() << " Not unrolling loop with inlinable calls.\n"); return false; } - - // 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(); + uint64_t Size = (uint64_t)LoopSize*Count; if (TripCount != 1 && Size > CurrentThreshold) { DEBUG(dbgs() << " Too large to fully unroll with count: " << Count << " because size: " << Size << ">" << CurrentThreshold << "\n"); |