[Turbofan] Simplify operand canonicalization on archs with simple FP aliasing.

src/compiler/instruction.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/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/schedule.h"
 #include "src/compiler/state-values-utils.h"
 
@@ skipping 43 matching lines @@
     case kNotOverflow:
     case kUnorderedEqual:
     case kUnorderedNotEqual:
       return condition;
   }
   UNREACHABLE();
   return condition;
 }
 
 bool InstructionOperand::InterferesWith(const InstructionOperand& that) const {
-  if (!IsFPRegister() || !that.IsFPRegister()) return EqualsCanonicalized(that);
-
+  if (!IsFPRegister() || !that.IsFPRegister() || kSimpleFPAliasing)
+    return EqualsCanonicalized(that);
+  // Both operands are fp registers and aliasing is non-simple.
   const LocationOperand& loc1 = *LocationOperand::cast(this);
   const LocationOperand& loc2 = LocationOperand::cast(that);
-  const RegisterConfiguration* config = GetRegConfig();
-  if (config->fp_aliasing_kind() != RegisterConfiguration::COMBINE)
-    return loc1.register_code() == loc2.register_code();
-
-  return config->AreAliases(loc1.representation(), loc1.register_code(),
-                            loc2.representation(), loc2.register_code());
+  return GetRegConfig()->AreAliases(loc1.representation(), loc1.register_code(),
+                                    loc2.representation(),
+                                    loc2.register_code());
 }
 
 void InstructionOperand::Print(const RegisterConfiguration* config) const {
   OFStream os(stdout);
   PrintableInstructionOperand wrapper;
   wrapper.register_configuration_ = config;
   wrapper.op_ = *this;
   os << wrapper << std::endl;
 }
 
@@ skipping 936 matching lines @@
   }
   for (int i = 0; i < code.InstructionBlockCount(); i++) {
     printable.sequence_->PrintBlock(printable.register_configuration_, i);
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8