diff options
Diffstat (limited to 'compiler/optimizing/loop_optimization.cc')
-rw-r--r-- | compiler/optimizing/loop_optimization.cc | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/compiler/optimizing/loop_optimization.cc b/compiler/optimizing/loop_optimization.cc index 8d698d6c82..215986910b 100644 --- a/compiler/optimizing/loop_optimization.cc +++ b/compiler/optimizing/loop_optimization.cc @@ -1094,9 +1094,16 @@ bool HLoopOptimization::TryFullUnrolling(LoopAnalysisInfo* analysis_info, bool g bool HLoopOptimization::TryLoopScalarOpts(LoopNode* node) { HLoopInformation* loop_info = node->loop_info; int64_t trip_count = LoopAnalysis::GetLoopTripCount(loop_info, &induction_range_); + if (trip_count == 0) { + // Mark the loop as dead. + HIf* loop_hif = loop_info->GetHeader()->GetLastInstruction()->AsIf(); + int32_t constant = loop_info->Contains(*loop_hif->IfTrueSuccessor()) ? 0 : 1; + loop_hif->ReplaceInput(graph_->GetIntConstant(constant), 0u); + return true; + } + LoopAnalysisInfo analysis_info(loop_info); LoopAnalysis::CalculateLoopBasicProperties(loop_info, &analysis_info, trip_count); - if (analysis_info.HasInstructionsPreventingScalarOpts() || arch_loop_helper_->IsLoopNonBeneficialForScalarOpts(&analysis_info)) { return false; |