From 6b69e0acb0e4c506ce2587e362c38e36e41e34ab Mon Sep 17 00:00:00 2001 From: Aart Bik Date: Wed, 11 Jan 2017 10:20:43 -0800 Subject: Complete unrolling of loops with small body and trip count one. Rationale: Avoids the unnecessary loop control overhead, suspend check, and exposes more opportunities for constant folding in the resulting loop body. Fully unrolls loop in execute() of the Dhrystone benchmark (3% to 8% improvements). Test: test-art-host Change-Id: If30f38caea9e9f87a929df041dfb7ed1c227aba3 --- compiler/optimizing/induction_var_range.cc | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'compiler/optimizing/induction_var_range.cc') diff --git a/compiler/optimizing/induction_var_range.cc b/compiler/optimizing/induction_var_range.cc index d5c4c2fa69..6d8ae75460 100644 --- a/compiler/optimizing/induction_var_range.cc +++ b/compiler/optimizing/induction_var_range.cc @@ -368,10 +368,14 @@ void InductionVarRange::Replace(HInstruction* instruction, } } -bool InductionVarRange::IsFinite(HLoopInformation* loop) const { +bool InductionVarRange::IsFinite(HLoopInformation* loop, /*out*/ int64_t* tc) const { HInductionVarAnalysis::InductionInfo *trip = induction_analysis_->LookupInfo(loop, GetLoopControl(loop)); - return trip != nullptr && !IsUnsafeTripCount(trip); + if (trip != nullptr && !IsUnsafeTripCount(trip)) { + IsConstant(trip->op_a, kExact, tc); + return true; + } + return false; } // -- cgit v1.2.3-59-g8ed1b