[stubs] Add SmiMax and refactor SmiMin to use Select

src/code-stub-assembler.cc

 // Copyright 2016 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/code-stub-assembler.h"
 #include "src/code-factory.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
 #include "src/ic/handler-configuration.h"
 #include "src/ic/stub-cache.h"
@@ skipping 331 matching lines @@
 }
 
 Node* CodeStubAssembler::SmiLessThan(Node* a, Node* b) {
   return IntPtrLessThan(a, b);
 }
 
 Node* CodeStubAssembler::SmiLessThanOrEqual(Node* a, Node* b) {
   return IntPtrLessThanOrEqual(a, b);
 }
 
+Node* CodeStubAssembler::SmiMax(Node* a, Node* b) {
+  return Select(SmiLessThan(a, b), b, a);
+}
+
 Node* CodeStubAssembler::SmiMin(Node* a, Node* b) {
-  // TODO(bmeurer): Consider using Select once available.
-  Variable min(this, MachineRepresentation::kTagged);
-  Label if_a(this), if_b(this), join(this);
-  BranchIfSmiLessThan(a, b, &if_a, &if_b);
-  Bind(&if_a);
-  min.Bind(a);
-  Goto(&join);
-  Bind(&if_b);
-  min.Bind(b);
-  Goto(&join);
-  Bind(&join);
-  return min.value();
+  return Select(SmiLessThan(a, b), a, b);
 }
 
 Node* CodeStubAssembler::SmiMod(Node* a, Node* b) {
   Variable var_result(this, MachineRepresentation::kTagged);
   Label return_result(this, &var_result),
       return_minuszero(this, Label::kDeferred),
       return_nan(this, Label::kDeferred);
 
   // Untag {a} and {b}.
   a = SmiToWord32(a);
@@ skipping 5014 matching lines @@
                        Heap::kTheHoleValueRootIndex);
 
   // Store the WeakCell in the feedback vector.
   StoreFixedArrayElement(feedback_vector, slot, cell, UPDATE_WRITE_BARRIER,
                          CodeStubAssembler::SMI_PARAMETERS);
   return cell;
 }
 
 }  // namespace internal
 }  // namespace v8