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[LoopUnroll] Enable advanced unrolling analysis by default. 

Summary:
This patch turns on LoopUnrollAnalyzer by default. To mitigate compile
time regressions, I chose very conservative thresholds for now. Later we
can make them more aggressive, but it might require being smarter in
which loops we're optimizing. E.g. currently the biggest issue is that
with more agressive thresholds we unroll many cold loops, which
increases compile time for no performance benefit (performance of those
loops is improved, but it doesn't matter since they are cold).

Test results for compile time(using 4 samples to reduce noise):
```
MultiSource/Benchmarks/VersaBench/ecbdes/ecbdes 5.19%
SingleSource/Benchmarks/Polybench/medley/reg_detect/reg_detect  4.19%
MultiSource/Benchmarks/FreeBench/fourinarow/fourinarow  3.39%
MultiSource/Applications/JM/lencod/lencod 1.47%
MultiSource/Benchmarks/Fhourstones-3_1/fhourstones3_1 -6.06%
```

I didn't see any performance changes in the testsuite, but it improves
some internal tests.

Reviewers: hfinkel, chandlerc

Subscribers: llvm-commits, mzolotukhin

Differential Revision: http://reviews.llvm.org/D20482

llvm-svn: 270478
This commit is contained in:
Michael Zolotukhin 2016-05-23 19:10:19 +00:00
parent f6f4a2a972
commit be080fc51d
2 changed files with 4 additions and 4 deletions
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6
llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
View File

@ -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::Hidden,
"unroll-percent-dynamic-cost-saved-threshold", cl::init(50), 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::Hidden,
"unroll-dynamic-cost-savings-discount", cl::init(100), 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(0), cl::Hidden,
"unroll-max-iteration-count-to-analyze", cl::init(10), cl::Hidden,
cl::desc("Don't allow loop unrolling to simulate more than this number of"
"iterations when checking full unroll profitability"));

2
llvm/test/Transforms/LoopUnroll/partial-unroll-const-bounds.ll
View File

@ -1,4 +1,4 @@
; RUN: opt < %s -S -unroll-threshold=20 -loop-unroll -unroll-allow-partial -unroll-runtime | FileCheck %s
; RUN: opt < %s -S -unroll-threshold=20 -loop-unroll -unroll-allow-partial -unroll-runtime -unroll-dynamic-cost-savings-discount=0 | 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.