[arm64] Optimize fcmp when lhs operand is #0.0

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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/compiler/osr.h"
@@ skipping 1365 matching lines @@
       break;
     case kUnsignedGreaterThan:
       __ j(above, tlabel);
       break;
     case kOverflow:
       __ j(overflow, tlabel);
       break;
     case kNotOverflow:
       __ j(no_overflow, tlabel);
       break;
+    default:
+      UNREACHABLE();
+      break;
   }
   if (!branch->fallthru) __ jmp(flabel, flabel_distance);
 }
 
 
 void CodeGenerator::AssembleArchJump(RpoNumber target) {
   if (!IsNextInAssemblyOrder(target)) __ jmp(GetLabel(target));
 }
 
 
@@ skipping 49 matching lines @@
       break;
     case kUnsignedGreaterThan:
       cc = above;
       break;
     case kOverflow:
       cc = overflow;
       break;
     case kNotOverflow:
       cc = no_overflow;
       break;
+    default:
+      UNREACHABLE();
+      break;
   }
   __ bind(&check);
   __ setcc(cc, reg);
   __ movzxbl(reg, reg);
   __ bind(&done);
 }
 
 
 void CodeGenerator::AssembleArchLookupSwitch(Instruction* instr) {
   X64OperandConverter i(this, instr);
@@ skipping 341 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace compiler
 }  // namespace v8