Introduce x87 port

src/platform.h

 // Copyright 2012 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.
 
 // This module contains the platform-specific code. This make the rest of the
 // code less dependent on operating system, compilers and runtime libraries.
 // This module does specifically not deal with differences between different
 // processor architecture.
 // The platform classes have the same definition for all platforms. The
 // implementation for a particular platform is put in platform_<os>.cc.
@@ skipping 34 matching lines @@
 
 #include "win32-headers.h"
 #include "win32-math.h"
 
 int strncasecmp(const char* s1, const char* s2, int n);
 
 // Visual C++ 2013 and higher implement this function.
 #if (_MSC_VER < 1800)
 inline int lrint(double flt) {
   int intgr;
-#if V8_TARGET_ARCH_IA32
+#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X87
   __asm {
     fld flt
     fistp intgr
   };
 #else
   intgr = static_cast<int>(flt + 0.5);
   if ((intgr & 1) != 0 && intgr - flt == 0.5) {
     // If the number is halfway between two integers, round to the even one.
     intgr--;
   }
 #endif
   return intgr;
 }
 #endif  // _MSC_VER < 1800
 
 #endif  // V8_LIBC_MSVCRT
 
 namespace v8 {
 namespace internal {
 
 // ----------------------------------------------------------------------------
 // Fast TLS support
 
 #ifndef V8_NO_FAST_TLS
 
-#if defined(_MSC_VER) && V8_HOST_ARCH_IA32
+#if defined(_MSC_VER) && (V8_HOST_ARCH_IA32)
 
 #define V8_FAST_TLS_SUPPORTED 1
 
 INLINE(intptr_t InternalGetExistingThreadLocal(intptr_t index));
 
 inline intptr_t InternalGetExistingThreadLocal(intptr_t index) {
   const intptr_t kTibInlineTlsOffset = 0xE10;
   const intptr_t kTibExtraTlsOffset = 0xF94;
   const intptr_t kMaxInlineSlots = 64;
   const intptr_t kMaxSlots = kMaxInlineSlots + 1024;
@@ skipping 193 matching lines @@
   static double nan_value();
 
   // Support runtime detection of whether the hard float option of the
   // EABI is used.
   static bool ArmUsingHardFloat();
 
   // Returns the activation frame alignment constraint or zero if
   // the platform doesn't care. Guaranteed to be a power of two.
   static int ActivationFrameAlignment();
 
-#if defined(V8_TARGET_ARCH_IA32)
+#if defined(V8_TARGET_ARCH_IA32) || defined(V8_TARGET_ARCH_X87)
   // Limit below which the extra overhead of the MemCopy function is likely
   // to outweigh the benefits of faster copying.
   static const int kMinComplexMemCopy = 64;
 
   // Copy memory area. No restrictions.
   static void MemMove(void* dest, const void* src, size_t size);
   typedef void (*MemMoveFunction)(void* dest, const void* src, size_t size);
 
   // Keep the distinction of "move" vs. "copy" for the benefit of other
   // architectures.
@@ skipping 278 matching lines @@
   char name_[kMaxThreadNameLength];
   int stack_size_;
   Semaphore* start_semaphore_;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_