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-rw-r--r--compiler/optimizing/loop_optimization.cc9
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;