vm_version_sparc.cpp revision 1650:f55c4f82ab9d 
1/*
2 * Copyright (c) 1997, 2009, 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 "incls/_precompiled.incl"
26# include "incls/_vm_version_sparc.cpp.incl"
27
28int VM_Version::_features = VM_Version::unknown_m;
29const char* VM_Version::_features_str = "";
30
31bool VM_Version::is_niagara1_plus() {
32  // This is a placeholder until the real test is determined.
33  return is_niagara1() &&
34    (os::processor_count() > maximum_niagara1_processor_count());
35}
36
37void VM_Version::initialize() {
38  _features = determine_features();
39  PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
40  PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
41  PrefetchFieldsAhead         = prefetch_fields_ahead();
42
43  // Allocation prefetch settings
44  intx cache_line_size = L1_data_cache_line_size();
45  if( cache_line_size > AllocatePrefetchStepSize )
46    AllocatePrefetchStepSize = cache_line_size;
47  if( FLAG_IS_DEFAULT(AllocatePrefetchLines) )
48    AllocatePrefetchLines = 3; // Optimistic value
49  assert( AllocatePrefetchLines > 0, "invalid value");
50  if( AllocatePrefetchLines < 1 ) // set valid value in product VM
51    AllocatePrefetchLines = 1; // Conservative value
52
53  AllocatePrefetchDistance = allocate_prefetch_distance();
54  AllocatePrefetchStyle    = allocate_prefetch_style();
55
56  assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
57
58  UseSSE = 0; // Only on x86 and x64
59
60  _supports_cx8               = has_v9();
61
62  if (is_niagara1()) {
63    // Indirect branch is the same cost as direct
64    if (FLAG_IS_DEFAULT(UseInlineCaches)) {
65      FLAG_SET_DEFAULT(UseInlineCaches, false);
66    }
67#ifdef _LP64
68    // 32-bit oops don't make sense for the 64-bit VM on sparc
69    // since the 32-bit VM has the same registers and smaller objects.
70    Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
71#endif // _LP64
72#ifdef COMPILER2
73    // Indirect branch is the same cost as direct
74    if (FLAG_IS_DEFAULT(UseJumpTables)) {
75      FLAG_SET_DEFAULT(UseJumpTables, true);
76    }
77    // Single-issue, so entry and loop tops are
78    // aligned on a single instruction boundary
79    if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
80      FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);
81    }
82    if (is_niagara1_plus()) {
83      if (AllocatePrefetchStyle > 0 && FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
84        // Use BIS instruction for allocation prefetch.
85        FLAG_SET_DEFAULT(AllocatePrefetchStyle, 3);
86        if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
87          // Use smaller prefetch distance on N2 with BIS
88          FLAG_SET_DEFAULT(AllocatePrefetchDistance, 64);
89        }
90      }
91      if (AllocatePrefetchStyle != 3 && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
92        // Use different prefetch distance without BIS
93        FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
94      }
95    }
96#endif
97    if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
98      FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
99    }
100    // When using CMS, we cannot use memset() in BOT updates because
101    // the sun4v/CMT version in libc_psr uses BIS which exposes
102    // "phantom zeros" to concurrent readers. See 6948537.
103    if (FLAG_IS_DEFAULT(UseMemSetInBOT) && UseConcMarkSweepGC) {
104      FLAG_SET_DEFAULT(UseMemSetInBOT, false);
105    }
106  }
107
108  // Use hardware population count instruction if available.
109  if (has_hardware_popc()) {
110    if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
111      FLAG_SET_DEFAULT(UsePopCountInstruction, true);
112    }
113  }
114
115#ifdef COMPILER2
116  // Currently not supported anywhere.
117  FLAG_SET_DEFAULT(UseFPUForSpilling, false);
118#endif
119
120  char buf[512];
121  jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s",
122               (has_v8() ? ", has_v8" : ""),
123               (has_v9() ? ", has_v9" : ""),
124               (has_hardware_popc() ? ", popc" : ""),
125               (has_vis1() ? ", has_vis1" : ""),
126               (has_vis2() ? ", has_vis2" : ""),
127               (is_ultra3() ? ", is_ultra3" : ""),
128               (is_sun4v() ? ", is_sun4v" : ""),
129               (is_niagara1() ? ", is_niagara1" : ""),
130               (is_niagara1_plus() ? ", is_niagara1_plus" : ""),
131               (!has_hardware_mul32() ? ", no-mul32" : ""),
132               (!has_hardware_div32() ? ", no-div32" : ""),
133               (!has_hardware_fsmuld() ? ", no-fsmuld" : ""));
134
135  // buf is started with ", " or is empty
136  _features_str = strdup(strlen(buf) > 2 ? buf + 2 : buf);
137
138#ifndef PRODUCT
139  if (PrintMiscellaneous && Verbose) {
140    tty->print("Allocation: ");
141    if (AllocatePrefetchStyle <= 0) {
142      tty->print_cr("no prefetching");
143    } else {
144      if (AllocatePrefetchLines > 1) {
145        tty->print_cr("PREFETCH %d, %d lines of size %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
146      } else {
147        tty->print_cr("PREFETCH %d, one line", AllocatePrefetchDistance);
148      }
149    }
150    if (PrefetchCopyIntervalInBytes > 0) {
151      tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes);
152    }
153    if (PrefetchScanIntervalInBytes > 0) {
154      tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes);
155    }
156    if (PrefetchFieldsAhead > 0) {
157      tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
158    }
159  }
160#endif // PRODUCT
161}
162
163void VM_Version::print_features() {
164  tty->print_cr("Version:%s", cpu_features());
165}
166
167int VM_Version::determine_features() {
168  if (UseV8InstrsOnly) {
169    NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-V8");)
170    return generic_v8_m;
171  }
172
173  int features = platform_features(unknown_m); // platform_features() is os_arch specific
174
175  if (features == unknown_m) {
176    features = generic_v9_m;
177    warning("Cannot recognize SPARC version. Default to V9");
178  }
179
180  if (UseNiagaraInstrs) {
181    if (is_niagara1(features)) {
182      // Happy to accomodate...
183    } else {
184      NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Niagara");)
185      features = niagara1_m;
186    }
187  } else {
188    if (is_niagara1(features) && !FLAG_IS_DEFAULT(UseNiagaraInstrs)) {
189      NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Not-Niagara");)
190      features &= ~niagara1_unique_m;
191    } else {
192      // Happy to accomodate...
193    }
194  }
195
196  return features;
197}
198
199static int saved_features = 0;
200
201void VM_Version::allow_all() {
202  saved_features = _features;
203  _features      = all_features_m;
204}
205
206void VM_Version::revert() {
207  _features = saved_features;
208}
209
210unsigned int VM_Version::calc_parallel_worker_threads() {
211  unsigned int result;
212  if (is_niagara1_plus()) {
213    result = nof_parallel_worker_threads(5, 16, 8);
214  } else {
215    result = nof_parallel_worker_threads(5, 8, 8);
216  }
217  return result;
218}
219