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 #ifdef TARGET_OS_FAMILY_windows
38 # include "os_windows.inline.hpp"
39 #endif
40
41 int VM_Version::_features = VM_Version::unknown_m;
42 const char* VM_Version::_features_str = "";
43
44 bool VM_Version::is_niagara1_plus() {
45 // This is a placeholder until the real test is determined.
46 return is_niagara1() &&
47 (os::processor_count() > maximum_niagara1_processor_count());
48 }
49
50 void VM_Version::initialize() {
51 _features = determine_features();
52 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
53 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
54 PrefetchFieldsAhead = prefetch_fields_ahead();
55
56 // Allocation prefetch settings
57 intx cache_line_size = L1_data_cache_line_size();
58 if( cache_line_size > AllocatePrefetchStepSize )
59 AllocatePrefetchStepSize = cache_line_size;
60 if( FLAG_IS_DEFAULT(AllocatePrefetchLines) )
61 AllocatePrefetchLines = 3; // Optimistic value
62 assert( AllocatePrefetchLines > 0, "invalid value");
63 if( AllocatePrefetchLines < 1 ) // set valid value in product VM
64 AllocatePrefetchLines = 1; // Conservative value
65
66 AllocatePrefetchDistance = allocate_prefetch_distance();
67 AllocatePrefetchStyle = allocate_prefetch_style();
68
69 assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
70
71 UseSSE = 0; // Only on x86 and x64
72
73 _supports_cx8 = has_v9();
74
75 if (is_niagara1()) {
76 // Indirect branch is the same cost as direct
77 if (FLAG_IS_DEFAULT(UseInlineCaches)) {
78 FLAG_SET_DEFAULT(UseInlineCaches, false);
79 }
80 #ifdef _LP64
81 // 32-bit oops don't make sense for the 64-bit VM on sparc
82 // since the 32-bit VM has the same registers and smaller objects.
83 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
84 #endif // _LP64
85 #ifdef COMPILER2
86 // Indirect branch is the same cost as direct
87 if (FLAG_IS_DEFAULT(UseJumpTables)) {
88 FLAG_SET_DEFAULT(UseJumpTables, true);
89 }
90 // Single-issue, so entry and loop tops are
91 // aligned on a single instruction boundary
92 if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
93 FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);
94 }
95 if (is_niagara1_plus()) {
96 if (AllocatePrefetchStyle > 0 && FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
97 // Use BIS instruction for allocation prefetch.
98 FLAG_SET_DEFAULT(AllocatePrefetchStyle, 3);
99 if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
100 // Use smaller prefetch distance on N2 with BIS
101 FLAG_SET_DEFAULT(AllocatePrefetchDistance, 64);
102 }
103 }
104 if (AllocatePrefetchStyle != 3 && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
105 // Use different prefetch distance without BIS
106 FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
107 }
108 }
109 #endif
110 if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
111 FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
112 }
113 // When using CMS, we cannot use memset() in BOT updates because
114 // the sun4v/CMT version in libc_psr uses BIS which exposes
115 // "phantom zeros" to concurrent readers. See 6948537.
116 if (FLAG_IS_DEFAULT(UseMemSetInBOT) && UseConcMarkSweepGC) {
117 FLAG_SET_DEFAULT(UseMemSetInBOT, false);
118 }
119 }
120
121 // Use hardware population count instruction if available.
122 if (has_hardware_popc()) {
123 if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
124 FLAG_SET_DEFAULT(UsePopCountInstruction, true);
125 }
126 }
127
128 #ifdef COMPILER2
129 // Currently not supported anywhere.
130 FLAG_SET_DEFAULT(UseFPUForSpilling, false);
131 #endif
132
133 char buf[512];
134 jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s",
135 (has_v8() ? ", has_v8" : ""),
136 (has_v9() ? ", has_v9" : ""),
137 (has_hardware_popc() ? ", popc" : ""),
138 (has_vis1() ? ", has_vis1" : ""),
139 (has_vis2() ? ", has_vis2" : ""),
140 (is_ultra3() ? ", is_ultra3" : ""),
141 (is_sun4v() ? ", is_sun4v" : ""),
142 (is_niagara1() ? ", is_niagara1" : ""),
143 (is_niagara1_plus() ? ", is_niagara1_plus" : ""),
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
176 void VM_Version::print_features() {
177 tty->print_cr("Version:%s", cpu_features());
178 }
179
180 int 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
212 static int saved_features = 0;
213
214 void VM_Version::allow_all() {
215 saved_features = _features;
216 _features = all_features_m;
217 }
218
219 void VM_Version::revert() {
220 _features = saved_features;
221 }
222
223 unsigned 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 }