Initiate a constant propagation pass in the optimizing compiler.

- Perform constant folding on int and long additions and subtractions in
  the optimizing compiler.
- Apply constant folding to conditions and comparisons.

Change-Id: Ic88783a3c975fda777c74c531e257fa777be42eb

1 files changed, 12 insertions, 0 deletions

diff --git a/compiler/optimizing/nodes.cc b/compiler/optimizing/nodes.cc
index 7b5a78eb39..82827952ba 100644
--- a/compiler/optimizing/nodes.cc
+++ b/compiler/optimizing/nodes.cc
@@ -505,6 +505,18 @@ void HGraphVisitor::VisitBasicBlock(HBasicBlock* block) {
   }
 }
 
+HConstant* HBinaryOperation::TryStaticEvaluation(ArenaAllocator* allocator) const {
+  if (GetLeft()->IsIntConstant() && GetRight()->IsIntConstant()) {
+    int32_t value = Evaluate(GetLeft()->AsIntConstant()->GetValue(),
+                             GetRight()->AsIntConstant()->GetValue());
+    return new(allocator) HIntConstant(value);
+  } else if (GetLeft()->IsLongConstant() && GetRight()->IsLongConstant()) {
+    int64_t value = Evaluate(GetLeft()->AsLongConstant()->GetValue(),
+                             GetRight()->AsLongConstant()->GetValue());
+    return new(allocator) HLongConstant(value);
+  }
+  return nullptr;
+}
 
 bool HCondition::NeedsMaterialization() const {
   if (!HasOnlyOneUse()) {