[arm64] Optimize fcmp when lhs operand is #0.0

src/compiler/arm64/code-generator-arm64.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/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 241 matching lines @@
     case kSignedGreaterThan:
       return gt;
     case kUnsignedLessThan:
       return lo;
     case kUnsignedGreaterThanOrEqual:
       return hs;
     case kUnsignedLessThanOrEqual:
       return ls;
     case kUnsignedGreaterThan:
       return hi;
+    case kFloatLessThanOrUnordered:
+      return lt;
+    case kFloatGreaterThanOrEqual:
+      return ge;
+    case kFloatLessThanOrEqual:
+      return ls;
+    case kFloatGreaterThanOrUnordered:
+      return hi;
+    case kFloatLessThan:
+      return lo;
+    case kFloatGreaterThanOrEqualOrUnordered:
+      return hs;
+    case kFloatLessThanOrEqualOrUnordered:
+      return le;
+    case kFloatGreaterThan:
+      return gt;
     case kOverflow:
       return vs;
     case kNotOverflow:
       return vc;
     case kUnorderedEqual:
     case kUnorderedNotEqual:
       break;
   }
   UNREACHABLE();
   return nv;
@@ skipping 1130 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8