Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 # include "incls/_precompiled.incl"

 # include "incls/_vm_version_sparc.cpp.incl"

 int VM_Version::_features = VM_Version::unknown_m;

 const char* VM_Version::_features_str = "";

 bool VM_Version::is_niagara1_plus() {

   // This is a placeholder until the real test is determined.

   return is_niagara1() &&

     (os::processor_count() > maximum_niagara1_processor_count());

 }

 void VM_Version::initialize() {

   _features = determine_features();

   PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();

   PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();

   PrefetchFieldsAhead         = prefetch_fields_ahead();

   // Allocation prefetch settings

   intx cache_line_size = L1_data_cache_line_size();

   if( cache_line_size > AllocatePrefetchStepSize )

     AllocatePrefetchStepSize = cache_line_size;

   if( FLAG_IS_DEFAULT(AllocatePrefetchLines) )

     AllocatePrefetchLines = 3; // Optimistic value

   assert( AllocatePrefetchLines > 0, "invalid value");

   if( AllocatePrefetchLines < 1 ) // set valid value in product VM

     AllocatePrefetchLines = 1; // Conservative value

   AllocatePrefetchDistance = allocate_prefetch_distance();

   AllocatePrefetchStyle    = allocate_prefetch_style();

   assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");

   UseSSE = 0; // Only on x86 and x64

   _supports_cx8               = has_v9();

   if (is_niagara1()) {

     // Indirect branch is the same cost as direct

     if (FLAG_IS_DEFAULT(UseInlineCaches)) {

       FLAG_SET_DEFAULT(UseInlineCaches, false);

     }

 #ifdef _LP64

     // Single issue niagara1 is slower for CompressedOops

     // but niagaras after that it's fine.

     if (!is_niagara1_plus()) {

       if (FLAG_IS_DEFAULT(UseCompressedOops)) {

         FLAG_SET_ERGO(bool, UseCompressedOops, false);

       }

     }

     // 32-bit oops don't make sense for the 64-bit VM on sparc

     // since the 32-bit VM has the same registers and smaller objects.

     Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);

 #endif // _LP64

 #ifdef COMPILER2

     // Indirect branch is the same cost as direct

     if (FLAG_IS_DEFAULT(UseJumpTables)) {

       FLAG_SET_DEFAULT(UseJumpTables, true);

     }

     // Single-issue, so entry and loop tops are

     // aligned on a single instruction boundary

     if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {

       FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);

     }

     if (is_niagara1_plus()) {

       if (AllocatePrefetchStyle > 0 && FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {

         // Use BIS instruction for allocation prefetch.

         FLAG_SET_DEFAULT(AllocatePrefetchStyle, 3);

         if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {

           // Use smaller prefetch distance on N2 with BIS

           FLAG_SET_DEFAULT(AllocatePrefetchDistance, 64);

         }

       }

       if (AllocatePrefetchStyle != 3 && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {

         // Use different prefetch distance without BIS

         FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);

       }

     }

 #endif

     if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {

       FLAG_SET_DEFAULT(OptoLoopAlignment, 4);

     }

     // When using CMS, we cannot use memset() in BOT updates because

     // the sun4v/CMT version in libc_psr uses BIS which exposes

     // "phantom zeros" to concurrent readers. See 6948537.

     if (FLAG_IS_DEFAULT(UseMemSetInBOT) && UseConcMarkSweepGC) {

       FLAG_SET_DEFAULT(UseMemSetInBOT, false);

     }

   }

   // Use hardware population count instruction if available.

   if (has_hardware_popc()) {

     if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {

       FLAG_SET_DEFAULT(UsePopCountInstruction, true);

     }

   }

   char buf[512];

   jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s",

                (has_v8() ? ", has_v8" : ""),

                (has_v9() ? ", has_v9" : ""),

                (has_hardware_popc() ? ", popc" : ""),

                (has_vis1() ? ", has_vis1" : ""),

                (has_vis2() ? ", has_vis2" : ""),

                (is_ultra3() ? ", is_ultra3" : ""),

                (is_sun4v() ? ", is_sun4v" : ""),

                (is_niagara1() ? ", is_niagara1" : ""),

                (is_niagara1_plus() ? ", is_niagara1_plus" : ""),

                (!has_hardware_mul32() ? ", no-mul32" : ""),

                (!has_hardware_div32() ? ", no-div32" : ""),

                (!has_hardware_fsmuld() ? ", no-fsmuld" : ""));

   // buf is started with ", " or is empty

   _features_str = strdup(strlen(buf) > 2 ? buf + 2 : buf);

 #ifndef PRODUCT

   if (PrintMiscellaneous && Verbose) {

     tty->print("Allocation: ");

     if (AllocatePrefetchStyle <= 0) {

       tty->print_cr("no prefetching");

     } else {

       if (AllocatePrefetchLines > 1) {

         tty->print_cr("PREFETCH %d, %d lines of size %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);

       } else {

         tty->print_cr("PREFETCH %d, one line", AllocatePrefetchDistance);

       }

     }

     if (PrefetchCopyIntervalInBytes > 0) {

       tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes);

     }

     if (PrefetchScanIntervalInBytes > 0) {

       tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes);

     }

     if (PrefetchFieldsAhead > 0) {

       tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);

     }

   }

 #endif // PRODUCT

 }

 void VM_Version::print_features() {

   tty->print_cr("Version:%s", cpu_features());

 }

 int VM_Version::determine_features() {

   if (UseV8InstrsOnly) {

     NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-V8");)

     return generic_v8_m;

   }

   int features = platform_features(unknown_m); // platform_features() is os_arch specific

   if (features == unknown_m) {

     features = generic_v9_m;

     warning("Cannot recognize SPARC version. Default to V9");

   }

   if (UseNiagaraInstrs) {

     if (is_niagara1(features)) {

       // Happy to accomodate...

     } else {

       NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Niagara");)

       features = niagara1_m;

     }

   } else {

     if (is_niagara1(features) && !FLAG_IS_DEFAULT(UseNiagaraInstrs)) {

       NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Not-Niagara");)

       features &= ~niagara1_unique_m;

     } else {

       // Happy to accomodate...

     }

   }

   return features;

 }

 static int saved_features = 0;

 void VM_Version::allow_all() {

   saved_features = _features;

   _features      = all_features_m;

 }

 void VM_Version::revert() {

   _features = saved_features;

 }

 unsigned int VM_Version::calc_parallel_worker_threads() {

   unsigned int result;

   if (is_niagara1_plus()) {

     result = nof_parallel_worker_threads(5, 16, 8);

   } else {

     result = nof_parallel_worker_threads(5, 8, 8);

   }

   return result;

 }