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| author | Hans Wennborg <hans@hanshq.net> | 2016-05-23 23:42:35 +0000 |
|---|---|---|
| committer | Hans Wennborg <hans@hanshq.net> | 2016-05-23 23:42:35 +0000 |
| commit | f82506b889bbf9d0ef11729d853ff68e101d019a (patch) | |
| tree | accb64bc9acacaf9df208340b508937b9938f21c | |
| parent | 24466fcd2c598109ad3c1a511212e2608cb064ba (diff) | |
Revert r270478 "[LoopUnroll] Enable advanced unrolling analysis by default."
This caused PR27847.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270512 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Transforms/Scalar/LoopUnrollPass.cpp | 6 | ||||
| -rw-r--r-- | test/Transforms/LoopUnroll/partial-unroll-const-bounds.ll | 2 |
2 files changed, 4 insertions, 4 deletions
diff --git a/lib/Transforms/Scalar/LoopUnrollPass.cpp b/lib/Transforms/Scalar/LoopUnrollPass.cpp index 8e65af9559e..d167c44c19c 100644 --- a/lib/Transforms/Scalar/LoopUnrollPass.cpp +++ b/lib/Transforms/Scalar/LoopUnrollPass.cpp @@ -45,18 +45,18 @@ static cl::opt<unsigned> cl::desc("The baseline cost threshold for loop unrolling")); static cl::opt<unsigned> UnrollPercentDynamicCostSavedThreshold( - "unroll-percent-dynamic-cost-saved-threshold", cl::init(50), cl::Hidden, + "unroll-percent-dynamic-cost-saved-threshold", cl::Hidden, cl::desc("The percentage of estimated dynamic cost which must be saved by " "unrolling to allow unrolling up to the max threshold.")); static cl::opt<unsigned> UnrollDynamicCostSavingsDiscount( - "unroll-dynamic-cost-savings-discount", cl::init(100), cl::Hidden, + "unroll-dynamic-cost-savings-discount", cl::Hidden, cl::desc("This is the amount discounted from the total unroll cost when " "the unrolled form has a high dynamic cost savings (triggered by " "the '-unroll-perecent-dynamic-cost-saved-threshold' flag).")); static cl::opt<unsigned> UnrollMaxIterationsCountToAnalyze( - "unroll-max-iteration-count-to-analyze", cl::init(10), cl::Hidden, + "unroll-max-iteration-count-to-analyze", cl::init(0), cl::Hidden, cl::desc("Don't allow loop unrolling to simulate more than this number of" "iterations when checking full unroll profitability")); diff --git a/test/Transforms/LoopUnroll/partial-unroll-const-bounds.ll b/test/Transforms/LoopUnroll/partial-unroll-const-bounds.ll index 5646aeaa7b9..c22a143c751 100644 --- a/test/Transforms/LoopUnroll/partial-unroll-const-bounds.ll +++ b/test/Transforms/LoopUnroll/partial-unroll-const-bounds.ll @@ -1,4 +1,4 @@ -; RUN: opt < %s -S -unroll-threshold=20 -loop-unroll -unroll-allow-partial -unroll-runtime -unroll-dynamic-cost-savings-discount=0 | FileCheck %s +; RUN: opt < %s -S -unroll-threshold=20 -loop-unroll -unroll-allow-partial -unroll-runtime | FileCheck %s ; The Loop TripCount is 9. However unroll factors 3 or 9 exceed given threshold. ; The test checks that we choose a smaller, power-of-two, unroll count and do not give up on unrolling. |