ART: Ensure use counts updated when adding SSA reg

Ensure that matching data structures are updated when adding SSA
registers late in the compile.

Change-Id: I8e664dddf52c1a9095ba5b7a8df84e5a733bbc43
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/compiler/dex/mir_dataflow.cc b/compiler/dex/mir_dataflow.cc
index 2f17e08974..ed7e1f5edd 100644
--- a/compiler/dex/mir_dataflow.cc
+++ b/compiler/dex/mir_dataflow.cc
@@ -925,11 +925,17 @@ bool MIRGraph::FindLocalLiveIn(BasicBlock* bb) {
 int MIRGraph::AddNewSReg(int v_reg) {
   // Compiler temps always have a subscript of 0
   int subscript = (v_reg < 0) ? 0 : ++ssa_last_defs_[v_reg];
-  int ssa_reg = GetNumSSARegs();
+  uint32_t ssa_reg = GetNumSSARegs();
   SetNumSSARegs(ssa_reg + 1);
   ssa_base_vregs_->Insert(v_reg);
   ssa_subscripts_->Insert(subscript);
   DCHECK_EQ(ssa_base_vregs_->Size(), ssa_subscripts_->Size());
+  // If we are expanding very late, update use counts too.
+  if (ssa_reg > 0 && use_counts_.Size() == ssa_reg) {
+    // Need to expand the counts.
+    use_counts_.Insert(0);
+    raw_use_counts_.Insert(0);
+  }
   return ssa_reg;
 }