Generalize bounds checks.

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
diff --git a/runtime/vm/intermediate_language_mips.cc b/runtime/vm/intermediate_language_mips.cc
index ccd135852723baae64889b375680cb106ebbb10c..737f5f56cbd12db5fa8f3366c69a2acc289e6d5e 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -4319,10 +4319,10 @@ LocationSummary* CheckClassInstr::MakeLocationSummary(Isolate* isolate,
 
 
 void CheckClassInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  const ICData::DeoptReasonId deopt_reason = licm_hoisted_ ?
-      ICData::kDeoptHoistedCheckClass : ICData::kDeoptCheckClass;
+  Label* deopt = compiler->AddDeoptStub(deopt_id(),
+                                        ICData::kDeoptCheckClass,
+                                        licm_hoisted_ ? ICData::kHoisted : 0);
   if (IsNullCheck()) {
-    Label* deopt = compiler->AddDeoptStub(deopt_id(), deopt_reason);
     __ BranchEqual(locs()->in(0).reg(),
         reinterpret_cast<int32_t>(Object::null()), deopt);
     return;
@@ -4332,7 +4332,6 @@ void CheckClassInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
          (unary_checks().NumberOfChecks() > 1));
   Register value = locs()->in(0).reg();
   Register temp = locs()->temp(0).reg();
-  Label* deopt = compiler->AddDeoptStub(deopt_id(), deopt_reason);
   Label is_ok;
   intptr_t cix = 0;
   if (unary_checks().GetReceiverClassIdAt(cix) == kSmiCid) {
@@ -4430,8 +4429,10 @@ LocationSummary* CheckArrayBoundInstr::MakeLocationSummary(Isolate* isolate,
 
 
 void CheckArrayBoundInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  Label* deopt = compiler->AddDeoptStub(deopt_id(),
-                                        ICData::kDeoptCheckArrayBound);
+  Label* deopt = compiler->AddDeoptStub(
+      deopt_id(),
+      ICData::kDeoptCheckArrayBound,
+      generalized_ ? ICData::kGeneralized : 0);
 
   Location length_loc = locs()->in(kLengthPos);
   Location index_loc = locs()->in(kIndexPos);
@@ -4454,8 +4455,12 @@ void CheckArrayBoundInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   } else if (length_loc.IsConstant()) {
     const Smi& length = Smi::Cast(length_loc.constant());
     Register index = index_loc.reg();
-    __ BranchUnsignedGreaterEqual(
-        index, reinterpret_cast<int32_t>(length.raw()), deopt);
+    if (length.Value() == Smi::kMaxValue) {
+      __ BranchSignedLess(index, 0, deopt);
+    } else {
+      __ BranchUnsignedGreaterEqual(
+          index, reinterpret_cast<int32_t>(length.raw()), deopt);
+    }
   } else {
     Register length = length_loc.reg();
     Register index = index_loc.reg();