/*

 * 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.

 *

 *

 */

# 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;

}