MIPS: [turbofan] Materialize JSFunction from frame if possible.

src/compiler/mips/code-generator-mips.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/mips/macro-assembler-mips.h"
 #include "src/scopes.h"
@@ skipping 1120 matching lines @@
           break;
         case Constant::kInt64:
           UNREACHABLE();
           break;
         case Constant::kFloat64:
           __ li(dst, isolate()->factory()->NewNumber(src.ToFloat64(), TENURED));
           break;
         case Constant::kExternalReference:
           __ li(dst, Operand(src.ToExternalReference()));
           break;
-        case Constant::kHeapObject:
-          __ li(dst, src.ToHeapObject());
+        case Constant::kHeapObject: {
+          Handle<HeapObject> src_object = src.ToHeapObject();
+          if (info()->IsOptimizing() &&
+              src_object.is_identical_to(info()->context())) {
+            // Loading the context from the frame is way cheaper than
+            // materializing the actual context heap object address.
+            __ lw(dst, MemOperand(fp, StandardFrameConstants::kContextOffset));
+          } else if (info()->IsOptimizing() &&
+                     src_object.is_identical_to(info()->closure())) {
+            // Loading the JSFunction from the frame is way cheaper than
+            // materializing the actual JSFunction heap object address.
+            __ lw(dst,
+                  MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+          } else {
+            __ li(dst, src_object);
+          }
           break;
+        }
         case Constant::kRpoNumber:
           UNREACHABLE();  // TODO(titzer): loading RPO numbers on mips.
           break;
       }
       if (destination->IsStackSlot()) __ sw(dst, g.ToMemOperand(destination));
     } else if (src.type() == Constant::kFloat32) {
       if (destination->IsDoubleStackSlot()) {
         MemOperand dst = g.ToMemOperand(destination);
         __ li(at, Operand(bit_cast<int32_t>(src.ToFloat32())));
         __ sw(at, dst);
@@ skipping 135 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8