[ia32/x64] Smaller instruction to check NaN

src/ia32/assembler-ia32.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 1152 matching lines @@
   void RecordComment(const char* msg, bool force = false);
 
   // Writes a single byte or word of data in the code stream.  Used for
   // inline tables, e.g., jump-tables.
   void db(uint8_t data);
   void dd(uint32_t data);
 
   // Check if there is less than kGap bytes available in the buffer.
   // If this is the case, we need to grow the buffer before emitting
   // an instruction or relocation information.
-  inline bool overflow() const { return pc_ >= reloc_info_writer.pos() - kGap; }
+  inline bool buffer_overflow() const {
+    return pc_ >= reloc_info_writer.pos() - kGap;
+  }
 
   // Get the number of bytes available in the buffer.
   inline int available_space() const { return reloc_info_writer.pos() - pc_; }
 
   static bool IsNop(Address addr);
 
   PositionsRecorder* positions_recorder() { return &positions_recorder_; }
 
   int relocation_writer_size() {
     return (buffer_ + buffer_size_) - reloc_info_writer.pos();
@@ skipping 75 matching lines @@
 };
 
 
 // Helper class that ensures that there is enough space for generating
 // instructions and relocation information.  The constructor makes
 // sure that there is enough space and (in debug mode) the destructor
 // checks that we did not generate too much.
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) : assembler_(assembler) {
-    if (assembler_->overflow()) assembler_->GrowBuffer();
+    if (assembler_->buffer_overflow()) assembler_->GrowBuffer();
 #ifdef DEBUG
     space_before_ = assembler_->available_space();
 #endif
   }
 
 #ifdef DEBUG
   ~EnsureSpace() {
     int bytes_generated = space_before_ - assembler_->available_space();
     ASSERT(bytes_generated < assembler_->kGap);
   }
 #endif
 
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_ASSEMBLER_IA32_H_