jdk8-mips64-public/hotspot: src/cpu/sparc/vm/vm_version

src/cpu/sparc/vm/vm_version_sparc.cpp@7eca5de9e0b6 (annotated)

src/cpu/sparc/vm/vm_version_sparc.cpp

Thu, 20 Sep 2012 16:49:17 +0200

author: roland
date: Thu, 20 Sep 2012 16:49:17 +0200
changeset 4106: 7eca5de9e0b6
parent 3997: f99a36499b8c
child 4108: 3a327d0b8586
permissions: -rw-r--r--

7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
Summary: use shorter instruction sequences for atomic add and atomic exchange when possible.
Reviewed-by: kvn, jrose

 /*
  * Copyright (c) 1997, 2012, 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 "precompiled.hpp"
 #include "assembler_sparc.inline.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/java.hpp"
 #include "runtime/stubCodeGenerator.hpp"
 #include "vm_version_sparc.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "os_solaris.inline.hpp"
 #endif
 int VM_Version::_features = VM_Version::unknown_m;
 const char* VM_Version::_features_str = "";
 void VM_Version::initialize() {
   _features = determine_features();
   PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
   PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
   PrefetchFieldsAhead         = prefetch_fields_ahead();
   assert(0 <= AllocatePrefetchInstr && AllocatePrefetchInstr <= 1, "invalid value");
   if( AllocatePrefetchInstr < 0 ) AllocatePrefetchInstr = 0;
   if( AllocatePrefetchInstr > 1 ) AllocatePrefetchInstr = 0;
   // Allocation prefetch settings
   intx cache_line_size = prefetch_data_size();
   if( cache_line_size > AllocatePrefetchStepSize )
     AllocatePrefetchStepSize = cache_line_size;
   assert(AllocatePrefetchLines > 0, "invalid value");
   if( AllocatePrefetchLines < 1 )     // set valid value in product VM
     AllocatePrefetchLines = 3;
   assert(AllocateInstancePrefetchLines > 0, "invalid value");
   if( AllocateInstancePrefetchLines < 1 ) // set valid value in product VM
     AllocateInstancePrefetchLines = 1;
   AllocatePrefetchDistance = allocate_prefetch_distance();
   AllocatePrefetchStyle    = allocate_prefetch_style();
   assert((AllocatePrefetchDistance % AllocatePrefetchStepSize) == 0 &&
          (AllocatePrefetchDistance > 0), "invalid value");
   if ((AllocatePrefetchDistance % AllocatePrefetchStepSize) != 0 ||
       (AllocatePrefetchDistance <= 0)) {
     AllocatePrefetchDistance = AllocatePrefetchStepSize;
   }
   if (AllocatePrefetchStyle == 3 && !has_blk_init()) {
     warning("BIS instructions are not available on this CPU");
     FLAG_SET_DEFAULT(AllocatePrefetchStyle, 1);
   }
   if (has_v9()) {
     assert(ArraycopySrcPrefetchDistance < 4096, "invalid value");
     if (ArraycopySrcPrefetchDistance >= 4096)
       ArraycopySrcPrefetchDistance = 4064;
     assert(ArraycopyDstPrefetchDistance < 4096, "invalid value");
     if (ArraycopyDstPrefetchDistance >= 4096)
       ArraycopyDstPrefetchDistance = 4064;
   } else {
     if (ArraycopySrcPrefetchDistance > 0) {
       warning("prefetch instructions are not available on this CPU");
       FLAG_SET_DEFAULT(ArraycopySrcPrefetchDistance, 0);
     }
     if (ArraycopyDstPrefetchDistance > 0) {
       warning("prefetch instructions are not available on this CPU");
       FLAG_SET_DEFAULT(ArraycopyDstPrefetchDistance, 0);
     }
   }
   UseSSE = 0; // Only on x86 and x64
   _supports_cx8 = has_v9();
   _supports_atomic_getset4 = true; // swap instruction
   if (is_niagara()) {
     // Indirect branch is the same cost as direct
     if (FLAG_IS_DEFAULT(UseInlineCaches)) {
       FLAG_SET_DEFAULT(UseInlineCaches, false);
     }
     // Align loops on a single instruction boundary.
     if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
       FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
     }
     // When using CMS or G1, 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 || UseG1GC)) {
       FLAG_SET_DEFAULT(UseMemSetInBOT, false);
     }
 #ifdef _LP64
     // 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_niagara_plus()) {
       if (has_blk_init() && UseTLAB &&
           FLAG_IS_DEFAULT(AllocatePrefetchInstr)) {
         // Use BIS instruction for TLAB allocation prefetch.
         FLAG_SET_ERGO(intx, AllocatePrefetchInstr, 1);
         if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
           FLAG_SET_ERGO(intx, AllocatePrefetchStyle, 3);
         }
         if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
           // Use smaller prefetch distance with BIS
           FLAG_SET_DEFAULT(AllocatePrefetchDistance, 64);
         }
       }
       if (is_T4()) {
         // Double number of prefetched cache lines on T4
         // since L2 cache line size is smaller (32 bytes).
         if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) {
           FLAG_SET_ERGO(intx, AllocatePrefetchLines, AllocatePrefetchLines*2);
         }
         if (FLAG_IS_DEFAULT(AllocateInstancePrefetchLines)) {
           FLAG_SET_ERGO(intx, AllocateInstancePrefetchLines, AllocateInstancePrefetchLines*2);
         }
       }
       if (AllocatePrefetchStyle != 3 && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
         // Use different prefetch distance without BIS
         FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
       }
       if (AllocatePrefetchInstr == 1) {
         // Need a space at the end of TLAB for BIS since it
         // will fault when accessing memory outside of heap.
         // +1 for rounding up to next cache line, +1 to be safe
         int lines = AllocatePrefetchLines + 2;
         int step_size = AllocatePrefetchStepSize;
         int distance = AllocatePrefetchDistance;
         _reserve_for_allocation_prefetch = (distance + step_size*lines)/(int)HeapWordSize;
       }
     }
 #endif
   }
   // Use hardware population count instruction if available.
   if (has_hardware_popc()) {
     if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
       FLAG_SET_DEFAULT(UsePopCountInstruction, true);
     }
   } else if (UsePopCountInstruction) {
     warning("POPC instruction is not available on this CPU");
     FLAG_SET_DEFAULT(UsePopCountInstruction, false);
   }
   // T4 and newer Sparc cpus have new compare and branch instruction.
   if (has_cbcond()) {
     if (FLAG_IS_DEFAULT(UseCBCond)) {
       FLAG_SET_DEFAULT(UseCBCond, true);
     }
   } else if (UseCBCond) {
     warning("CBCOND instruction is not available on this CPU");
     FLAG_SET_DEFAULT(UseCBCond, false);
   }
   assert(BlockZeroingLowLimit > 0, "invalid value");
   if (has_block_zeroing()) {
     if (FLAG_IS_DEFAULT(UseBlockZeroing)) {
       FLAG_SET_DEFAULT(UseBlockZeroing, true);
     }
   } else if (UseBlockZeroing) {
     warning("BIS zeroing instructions are not available on this CPU");
     FLAG_SET_DEFAULT(UseBlockZeroing, false);
   }
   assert(BlockCopyLowLimit > 0, "invalid value");
   if (has_block_zeroing()) { // has_blk_init() && is_T4(): core's local L2 cache
     if (FLAG_IS_DEFAULT(UseBlockCopy)) {
       FLAG_SET_DEFAULT(UseBlockCopy, true);
     }
   } else if (UseBlockCopy) {
     warning("BIS instructions are not available or expensive on this CPU");
     FLAG_SET_DEFAULT(UseBlockCopy, false);
   }
 #ifdef COMPILER2
   // T4 and newer Sparc cpus have fast RDPC.
   if (has_fast_rdpc() && FLAG_IS_DEFAULT(UseRDPCForConstantTableBase)) {
     FLAG_SET_DEFAULT(UseRDPCForConstantTableBase, true);
   }
   // Currently not supported anywhere.
   FLAG_SET_DEFAULT(UseFPUForSpilling, false);
   MaxVectorSize = 8;
   assert((InteriorEntryAlignment % relocInfo::addr_unit()) == 0, "alignment is not a multiple of NOP size");
 #endif
   assert((CodeEntryAlignment % relocInfo::addr_unit()) == 0, "alignment is not a multiple of NOP size");
   assert((OptoLoopAlignment % relocInfo::addr_unit()) == 0, "alignment is not a multiple of NOP size");
   char buf[512];
   jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
                (has_v9() ? ", v9" : (has_v8() ? ", v8" : "")),
                (has_hardware_popc() ? ", popc" : ""),
                (has_vis1() ? ", vis1" : ""),
                (has_vis2() ? ", vis2" : ""),
                (has_vis3() ? ", vis3" : ""),
                (has_blk_init() ? ", blk_init" : ""),
                (has_cbcond() ? ", cbcond" : ""),
                (is_ultra3() ? ", ultra3" : ""),
                (is_sun4v() ? ", sun4v" : ""),
                (is_niagara_plus() ? ", niagara_plus" : (is_niagara() ? ", niagara" : "")),
                (is_sparc64() ? ", sparc64" : ""),
                (!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);
   // UseVIS is set to the smallest of what hardware supports and what
   // the command line requires.  I.e., you cannot set UseVIS to 3 on
   // older UltraSparc which do not support it.
   if (UseVIS > 3) UseVIS=3;
   if (UseVIS < 0) UseVIS=0;
   if (!has_vis3()) // Drop to 2 if no VIS3 support
     UseVIS = MIN2((intx)2,UseVIS);
   if (!has_vis2()) // Drop to 1 if no VIS2 support
     UseVIS = MIN2((intx)1,UseVIS);
   if (!has_vis1()) // Drop to 0 if no VIS1 support
     UseVIS = 0;
 #ifndef PRODUCT
   if (PrintMiscellaneous && Verbose) {
     tty->print("Allocation");
     if (AllocatePrefetchStyle <= 0) {
       tty->print_cr(": no prefetching");
     } else {
       tty->print(" prefetching: ");
       if (AllocatePrefetchInstr == 0) {
           tty->print("PREFETCH");
       } else if (AllocatePrefetchInstr == 1) {
           tty->print("BIS");
       }
       if (AllocatePrefetchLines > 1) {
         tty->print_cr(" at distance %d, %d lines of %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
       } else {
         tty->print_cr(" at distance %d, one line of %d bytes", AllocatePrefetchDistance, AllocatePrefetchStepSize);
       }
     }
     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");
   }
   assert(is_T_family(features) == is_niagara(features), "Niagara should be T series");
   if (UseNiagaraInstrs) { // Force code generation for Niagara
     if (is_T_family(features)) {
       // Happy to accomodate...
     } else {
       NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Niagara");)
       features |= T_family_m;
     }
   } else {
     if (is_T_family(features) && !FLAG_IS_DEFAULT(UseNiagaraInstrs)) {
       NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Not-Niagara");)
       features &= ~(T_family_m | T1_model_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_niagara_plus()) {
     result = nof_parallel_worker_threads(5, 16, 8);
   } else {
     result = nof_parallel_worker_threads(5, 8, 8);
   }
   return result;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/sparc/vm/vm_version_sparc.cpp@7eca5de9e0b6 (annotated)

src/cpu/sparc/vm/vm_version_sparc.cpp