vm_version_sparc.cpp revision 1879:f95d63e2154a 
1/*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "assembler_sparc.inline.hpp"
27#include "memory/resourceArea.hpp"
28#include "runtime/java.hpp"
29#include "runtime/stubCodeGenerator.hpp"
30#include "vm_version_sparc.hpp"
31#ifdef TARGET_OS_FAMILY_linux
32# include "os_linux.inline.hpp"
33#endif
34#ifdef TARGET_OS_FAMILY_solaris
35# include "os_solaris.inline.hpp"
36#endif
37
38int VM_Version::_features = VM_Version::unknown_m;
39const char* VM_Version::_features_str = "";
40
41bool VM_Version::is_niagara1_plus() {
42  // This is a placeholder until the real test is determined.
43  return is_niagara1() &&
44    (os::processor_count() > maximum_niagara1_processor_count());
45}
46
47void VM_Version::initialize() {
48  _features = determine_features();
49  PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
50  PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
51  PrefetchFieldsAhead         = prefetch_fields_ahead();
52
53  // Allocation prefetch settings
54  intx cache_line_size = L1_data_cache_line_size();
55  if( cache_line_size > AllocatePrefetchStepSize )
56    AllocatePrefetchStepSize = cache_line_size;
57  if( FLAG_IS_DEFAULT(AllocatePrefetchLines) )
58    AllocatePrefetchLines = 3; // Optimistic value
59  assert( AllocatePrefetchLines > 0, "invalid value");
60  if( AllocatePrefetchLines < 1 ) // set valid value in product VM
61    AllocatePrefetchLines = 1; // Conservative value
62
63  AllocatePrefetchDistance = allocate_prefetch_distance();
64  AllocatePrefetchStyle    = allocate_prefetch_style();
65
66  assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
67
68  UseSSE = 0; // Only on x86 and x64
69
70  _supports_cx8               = has_v9();
71
72  if (is_niagara1()) {
73    // Indirect branch is the same cost as direct
74    if (FLAG_IS_DEFAULT(UseInlineCaches)) {
75      FLAG_SET_DEFAULT(UseInlineCaches, false);
76    }
77#ifdef _LP64
78    // 32-bit oops don't make sense for the 64-bit VM on sparc
79    // since the 32-bit VM has the same registers and smaller objects.
80    Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
81#endif // _LP64
82#ifdef COMPILER2
83    // Indirect branch is the same cost as direct
84    if (FLAG_IS_DEFAULT(UseJumpTables)) {
85      FLAG_SET_DEFAULT(UseJumpTables, true);
86    }
87    // Single-issue, so entry and loop tops are
88    // aligned on a single instruction boundary
89    if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
90      FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);
91    }
92    if (is_niagara1_plus()) {
93      if (has_blk_init() && AllocatePrefetchStyle > 0 &&
94          FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
95        // Use BIS instruction for allocation prefetch.
96        FLAG_SET_DEFAULT(AllocatePrefetchStyle, 3);
97        if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
98          // Use smaller prefetch distance on N2 with BIS
99          FLAG_SET_DEFAULT(AllocatePrefetchDistance, 64);
100        }
101      }
102      if (AllocatePrefetchStyle != 3 && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
103        // Use different prefetch distance without BIS
104        FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
105      }
106    }
107#endif
108    if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
109      FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
110    }
111    // When using CMS, we cannot use memset() in BOT updates because
112    // the sun4v/CMT version in libc_psr uses BIS which exposes
113    // "phantom zeros" to concurrent readers. See 6948537.
114    if (FLAG_IS_DEFAULT(UseMemSetInBOT) && UseConcMarkSweepGC) {
115      FLAG_SET_DEFAULT(UseMemSetInBOT, false);
116    }
117  }
118
119  // Use hardware population count instruction if available.
120  if (has_hardware_popc()) {
121    if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
122      FLAG_SET_DEFAULT(UsePopCountInstruction, true);
123    }
124  }
125
126#ifdef COMPILER2
127  // Currently not supported anywhere.
128  FLAG_SET_DEFAULT(UseFPUForSpilling, false);
129#endif
130
131  char buf[512];
132  jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
133               (has_v8() ? ", has_v8" : ""),
134               (has_v9() ? ", has_v9" : ""),
135               (has_hardware_popc() ? ", popc" : ""),
136               (has_vis1() ? ", has_vis1" : ""),
137               (has_vis2() ? ", has_vis2" : ""),
138               (has_blk_init() ? ", has_blk_init" : ""),
139               (is_ultra3() ? ", is_ultra3" : ""),
140               (is_sun4v() ? ", is_sun4v" : ""),
141               (is_niagara1() ? ", is_niagara1" : ""),
142               (is_niagara1_plus() ? ", is_niagara1_plus" : ""),
143               (is_sparc64() ? ", is_sparc64" : ""),
144               (!has_hardware_mul32() ? ", no-mul32" : ""),
145               (!has_hardware_div32() ? ", no-div32" : ""),
146               (!has_hardware_fsmuld() ? ", no-fsmuld" : ""));
147
148  // buf is started with ", " or is empty
149  _features_str = strdup(strlen(buf) > 2 ? buf + 2 : buf);
150
151#ifndef PRODUCT
152  if (PrintMiscellaneous && Verbose) {
153    tty->print("Allocation: ");
154    if (AllocatePrefetchStyle <= 0) {
155      tty->print_cr("no prefetching");
156    } else {
157      if (AllocatePrefetchLines > 1) {
158        tty->print_cr("PREFETCH %d, %d lines of size %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
159      } else {
160        tty->print_cr("PREFETCH %d, one line", AllocatePrefetchDistance);
161      }
162    }
163    if (PrefetchCopyIntervalInBytes > 0) {
164      tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes);
165    }
166    if (PrefetchScanIntervalInBytes > 0) {
167      tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes);
168    }
169    if (PrefetchFieldsAhead > 0) {
170      tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
171    }
172  }
173#endif // PRODUCT
174}
175
176void VM_Version::print_features() {
177  tty->print_cr("Version:%s", cpu_features());
178}
179
180int VM_Version::determine_features() {
181  if (UseV8InstrsOnly) {
182    NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-V8");)
183    return generic_v8_m;
184  }
185
186  int features = platform_features(unknown_m); // platform_features() is os_arch specific
187
188  if (features == unknown_m) {
189    features = generic_v9_m;
190    warning("Cannot recognize SPARC version. Default to V9");
191  }
192
193  if (UseNiagaraInstrs) {
194    if (is_niagara1(features)) {
195      // Happy to accomodate...
196    } else {
197      NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Niagara");)
198      features = niagara1_m;
199    }
200  } else {
201    if (is_niagara1(features) && !FLAG_IS_DEFAULT(UseNiagaraInstrs)) {
202      NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Not-Niagara");)
203      features &= ~niagara1_unique_m;
204    } else {
205      // Happy to accomodate...
206    }
207  }
208
209  return features;
210}
211
212static int saved_features = 0;
213
214void VM_Version::allow_all() {
215  saved_features = _features;
216  _features      = all_features_m;
217}
218
219void VM_Version::revert() {
220  _features = saved_features;
221}
222
223unsigned int VM_Version::calc_parallel_worker_threads() {
224  unsigned int result;
225  if (is_niagara1_plus()) {
226    result = nof_parallel_worker_threads(5, 16, 8);
227  } else {
228    result = nof_parallel_worker_threads(5, 8, 8);
229  }
230  return result;
231}
232