diff options
Diffstat (limited to 'compiler/optimizing/loop_analysis.cc')
| -rw-r--r-- | compiler/optimizing/loop_analysis.cc | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/compiler/optimizing/loop_analysis.cc b/compiler/optimizing/loop_analysis.cc index efb23e7d3e..d355cedb35 100644 --- a/compiler/optimizing/loop_analysis.cc +++ b/compiler/optimizing/loop_analysis.cc @@ -84,6 +84,8 @@ class ArchDefaultLoopHelper : public ArchNoOptsLoopHelper { static constexpr uint32_t kScalarHeuristicMaxBodySizeInstr = 17; // Loop's maximum basic block count. Loops with higher count will not be peeled/unrolled. static constexpr uint32_t kScalarHeuristicMaxBodySizeBlocks = 6; + // Maximum number of instructions to be created as a result of full unrolling. + static constexpr uint32_t kScalarHeuristicFullyUnrolledMaxInstrThreshold = 35; bool IsLoopNonBeneficialForScalarOpts(LoopAnalysisInfo* analysis_info) const OVERRIDE { return analysis_info->HasLongTypeInstructions() || @@ -108,6 +110,14 @@ class ArchDefaultLoopHelper : public ArchNoOptsLoopHelper { bool IsLoopPeelingEnabled() const OVERRIDE { return true; } + bool IsFullUnrollingBeneficial(LoopAnalysisInfo* analysis_info) const OVERRIDE { + int64_t trip_count = analysis_info->GetTripCount(); + // We assume that trip count is known. + DCHECK_NE(trip_count, LoopAnalysisInfo::kUnknownTripCount); + size_t instr_num = analysis_info->GetNumberOfInstructions(); + return (trip_count * instr_num < kScalarHeuristicFullyUnrolledMaxInstrThreshold); + } + protected: bool IsLoopTooBig(LoopAnalysisInfo* loop_analysis_info, size_t instr_threshold, |