Add Uint32 representation

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
diff --git a/runtime/vm/intermediate_language.cc b/runtime/vm/intermediate_language.cc
index bc136fb6040e660e7e2b7eb0e01c48f03be1e435..8385f1ae5775a3a38f264fac42db5f9ac30db8e0 100644
--- a/runtime/vm/intermediate_language.cc
+++ b/runtime/vm/intermediate_language.cc
@@ -343,6 +343,45 @@ bool Value::BindsToConstant() const {
 }
 
 
+bool Value::BindsTo32BitMint() const {
+  if (!definition()->IsMintDefinition()) {
+    return false;
+  }
+  if (definition()->IsBinaryMintOp()) {
+    BinaryMintOpInstr* instr = definition()->AsBinaryMintOp();
+    return instr->is_32_bit();
+  } else if (definition()->IsShiftMintOp()) {
+    ShiftMintOpInstr* instr = definition()->AsShiftMintOp();
+    return instr->is_32_bit();
+  } else if (definition()->IsUnboxInteger()) {
+    UnboxIntegerInstr* instr = definition()->AsUnboxInteger();
+    return instr->is_32_bit();
+  } else if (definition()->IsUnaryMintOp()) {
+    UnaryMintOpInstr* instr = definition()->AsUnaryMintOp();
+    return instr->is_32_bit();
+  }
+  return false;
+}
+
+
+bool Value::BindsTo32BitMaskConstant() const {
+  if (!definition()->IsUnboxInteger()) {
+    return false;
+  }
+  UnboxIntegerInstr* instr = definition()->AsUnboxInteger();
+  if (!instr->value()->BindsToConstant()) {
+    return false;
+  }
+  const Object& obj = instr->value()->BoundConstant();
+  if (!obj.IsMint()) {
+    return false;
+  }
+  Mint& mint = Mint::Handle();
+  mint ^= obj.raw();
+  return mint.value() == kMaxUint32;
+}
+
+
 // Returns true if the value represents constant null.
 bool Value::BindsToConstantNull() const {
   ConstantInstr* constant = definition()->AsConstant();
@@ -3217,6 +3256,13 @@ void BinarySmiOpInstr::InferRange() {
 }
 
 
+Representation BinaryMintOpInstr::RequiredInputRepresentation(
+    intptr_t idx) const {
+  ASSERT((idx == 0) || (idx == 1));
+  return InputAt(idx)->BindsTo32BitMint() ? kUnboxedMint32 : kUnboxedMint;
+}
+
+
 void BinaryMintOpInstr::InferRange() {
   // TODO(vegorov): canonicalize BinaryMintOpInstr to always have constant on
   // the right and a non-constant on the left.
@@ -3410,12 +3456,25 @@ bool Range::And(const Range* left_range,
   ASSERT(result_min != NULL);
   ASSERT(result_max != NULL);
 
+  // Both ranges are >= 0.
+  if ((Range::ConstantMin(left_range).ConstantValue() >= 0) &&
+      (Range::ConstantMin(right_range).ConstantValue() >= 0)) {
+    *result_min = RangeBoundary::FromConstant(0);
+    // Take minimum value as new range.
+    *result_max = RangeBoundary::Min(Range::ConstantMax(left_range),
+                                     Range::ConstantMax(right_range),
+                                     RangeBoundary::kRangeBoundaryInt64);
+    return true;
+  }
+
+  // Right range is >= 0.
   if (Range::ConstantMin(right_range).ConstantValue() >= 0) {
     *result_min = RangeBoundary::FromConstant(0);
     *result_max = Range::ConstantMax(right_range);
     return true;
   }
 
+  // Left range is >= 0.
   if (Range::ConstantMin(left_range).ConstantValue() >= 0) {
     *result_min = RangeBoundary::FromConstant(0);
     *result_max = Range::ConstantMax(left_range);