VM: Speculative inlining in precompiled code.

runtime/vm/flow_graph_range_analysis.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_range_analysis.h"
 
 #include "vm/bit_vector.h"
+#include "vm/compiler.h"
 #include "vm/il_printer.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, array_bounds_check_elimination, true,
     "Eliminate redundant bounds checks.");
 DEFINE_FLAG(bool, trace_range_analysis, false, "Trace range analysis progress");
 DEFINE_FLAG(bool, trace_integer_ir_selection, false,
     "Print integer IR selection optimization pass.");
 DECLARE_FLAG(bool, trace_constant_propagation);
@@ skipping 1503 matching lines @@
 
   RangeAnalysis* range_analysis_;
   FlowGraph* flow_graph_;
   Scheduler scheduler_;
 };
 
 
 void RangeAnalysis::EliminateRedundantBoundsChecks() {
   if (FLAG_array_bounds_check_elimination) {
     const Function& function = flow_graph_->function();
+    // Generalization only if we have not deoptimized on a generalized
+    // check earlier, or we're compiling precompiled code (no
+    // optimistic hoisting of checks possible)
     const bool try_generalization =
-        function.allows_bounds_check_generalization();
+        function.allows_bounds_check_generalization() &&
+        !Compiler::always_optimize();
 
     BoundsCheckGeneralizer generalizer(this, flow_graph_);
 
     for (intptr_t i = 0; i < bounds_checks_.length(); i++) {
       CheckArrayBoundInstr* check = bounds_checks_[i];
       RangeBoundary array_length =
           RangeBoundary::FromDefinition(check->length()->definition());
       if (check->IsRedundant(array_length)) {
         check->RemoveFromGraph();
       } else if (try_generalization) {
@@ skipping 1610 matching lines @@
     }
   } while (CanonicalizeMaxBoundary(&max) ||
            CanonicalizeMinBoundary(&canonical_length));
 
   // Failed to prove that maximum is bounded with array length.
   return false;
 }
 
 
 }  // namespace dart