Get rid of the "spare buffer" cache.

src/x64/assembler-x64.cc

 // 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/macro-assembler.h"
 #include "src/serialize.h"
@@ skipping 313 matching lines @@
   bind_to(L, pc_offset());
 }
 
 
 void Assembler::GrowBuffer() {
   DCHECK(buffer_overflow());
   if (!own_buffer_) FATAL("external code buffer is too small");
 
   // Compute new buffer size.
   CodeDesc desc;  // the new buffer
-  if (buffer_size_ < 4*KB) {
-    desc.buffer_size = 4*KB;
+  if (buffer_size_ == 0) {
+    desc.buffer_size = kMinimalBufferSize;
   } else {
     desc.buffer_size = 2*buffer_size_;
   }
   // Some internal data structures overflow for very large buffers,
   // they must ensure that kMaximalBufferSize is not too large.
   if ((desc.buffer_size > kMaximalBufferSize) ||
       (desc.buffer_size > isolate()->heap()->MaxOldGenerationSize())) {
     V8::FatalProcessOutOfMemory("Assembler::GrowBuffer");
   }
 
@@ skipping 10 matching lines @@
 #endif
 
   // Copy the data.
   intptr_t pc_delta = desc.buffer - buffer_;
   intptr_t rc_delta = (desc.buffer + desc.buffer_size) -
       (buffer_ + buffer_size_);
   MemMove(desc.buffer, buffer_, desc.instr_size);
   MemMove(rc_delta + reloc_info_writer.pos(), reloc_info_writer.pos(),
           desc.reloc_size);
 
-  // Switch buffers.
-  if (isolate() != NULL &&
-      isolate()->assembler_spare_buffer() == NULL &&
-      buffer_size_ == kMinimalBufferSize) {
-    isolate()->set_assembler_spare_buffer(buffer_);
-  } else {
-    DeleteArray(buffer_);
-  }
+  DeleteArray(buffer_);
   buffer_ = desc.buffer;
   buffer_size_ = desc.buffer_size;
   pc_ += pc_delta;
   reloc_info_writer.Reposition(reloc_info_writer.pos() + rc_delta,
                                reloc_info_writer.last_pc() + pc_delta);
 
   // Relocate runtime entries.
   for (RelocIterator it(desc); !it.done(); it.next()) {
     RelocInfo::Mode rmode = it.rinfo()->rmode();
     if (rmode == RelocInfo::INTERNAL_REFERENCE) {
@@ skipping 2611 matching lines @@
 
 
 bool RelocInfo::IsInConstantPool() {
   return false;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64