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
38 int VM_Version::_features = VM_Version::unknown_m;
39 const char* VM_Version::_features_str = "";
40
41 void VM_Version::initialize() {
42 _features = determine_features();
43 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
44 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
45 PrefetchFieldsAhead = prefetch_fields_ahead();
46
47 // Allocation prefetch settings
48 intx cache_line_size = L1_data_cache_line_size();
49 if( cache_line_size > AllocatePrefetchStepSize )
50 AllocatePrefetchStepSize = cache_line_size;
51 if( FLAG_IS_DEFAULT(AllocatePrefetchLines) )
52 AllocatePrefetchLines = 3; // Optimistic value
53 assert( AllocatePrefetchLines > 0, "invalid value");
54 if( AllocatePrefetchLines < 1 ) // set valid value in product VM
55 AllocatePrefetchLines = 1; // Conservative value
56
57 AllocatePrefetchDistance = allocate_prefetch_distance();
58 AllocatePrefetchStyle = allocate_prefetch_style();
59
60 assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
61
62 UseSSE = 0; // Only on x86 and x64
63
64 _supports_cx8 = has_v9();
65
66 if (is_niagara()) {
67 // Indirect branch is the same cost as direct
68 if (FLAG_IS_DEFAULT(UseInlineCaches)) {
69 FLAG_SET_DEFAULT(UseInlineCaches, false);
70 }
71 // Align loops on a single instruction boundary.
72 if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
73 FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
74 }
75 // When using CMS, we cannot use memset() in BOT updates because
76 // the sun4v/CMT version in libc_psr uses BIS which exposes
77 // "phantom zeros" to concurrent readers. See 6948537.
78 if (FLAG_IS_DEFAULT(UseMemSetInBOT) && UseConcMarkSweepGC) {
79 FLAG_SET_DEFAULT(UseMemSetInBOT, false);
80 }
81 #ifdef _LP64
82 // 32-bit oops don't make sense for the 64-bit VM on sparc
83 // since the 32-bit VM has the same registers and smaller objects.
84 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
85 #endif // _LP64
86 #ifdef COMPILER2
87 // Indirect branch is the same cost as direct
88 if (FLAG_IS_DEFAULT(UseJumpTables)) {
89 FLAG_SET_DEFAULT(UseJumpTables, true);
90 }
91 // Single-issue, so entry and loop tops are
92 // aligned on a single instruction boundary
93 if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
94 FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);
95 }
96 if (is_niagara_plus()) {
97 if (has_blk_init() && AllocatePrefetchStyle > 0 &&
98 FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
99 // Use BIS instruction for allocation prefetch.
100 FLAG_SET_DEFAULT(AllocatePrefetchStyle, 3);
101 if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
102 // Use smaller prefetch distance on N2 with BIS
103 FLAG_SET_DEFAULT(AllocatePrefetchDistance, 64);
104 }
105 }
106 if (AllocatePrefetchStyle != 3 && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
107 // Use different prefetch distance without BIS
108 FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
109 }
110 }
111 #endif
112 }
113
114 // Use hardware population count instruction if available.
115 if (has_hardware_popc()) {
116 if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
117 FLAG_SET_DEFAULT(UsePopCountInstruction, true);
118 }
119 }
120
121 #ifdef COMPILER2
122 // Currently not supported anywhere.
123 FLAG_SET_DEFAULT(UseFPUForSpilling, false);
124 #endif
125
126 char buf[512];
127 jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
128 (has_v8() ? ", has_v8" : ""),
129 (has_v9() ? ", has_v9" : ""),
130 (has_hardware_popc() ? ", popc" : ""),
131 (has_vis1() ? ", has_vis1" : ""),
132 (has_vis2() ? ", has_vis2" : ""),
133 (has_vis3() ? ", has_vis3" : ""),
134 (has_blk_init() ? ", has_blk_init" : ""),
135 (is_ultra3() ? ", is_ultra3" : ""),
136 (is_sun4v() ? ", is_sun4v" : ""),
137 (is_niagara() ? ", is_niagara" : ""),
138 (is_niagara_plus() ? ", is_niagara_plus" : ""),
139 (is_sparc64() ? ", is_sparc64" : ""),
140 (!has_hardware_mul32() ? ", no-mul32" : ""),
141 (!has_hardware_div32() ? ", no-div32" : ""),
142 (!has_hardware_fsmuld() ? ", no-fsmuld" : ""));
143
144 // buf is started with ", " or is empty
145 _features_str = strdup(strlen(buf) > 2 ? buf + 2 : buf);
146
147 #ifndef PRODUCT
148 if (PrintMiscellaneous && Verbose) {
149 tty->print("Allocation: ");
150 if (AllocatePrefetchStyle <= 0) {
151 tty->print_cr("no prefetching");
152 } else {
153 if (AllocatePrefetchLines > 1) {
154 tty->print_cr("PREFETCH %d, %d lines of size %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
155 } else {
156 tty->print_cr("PREFETCH %d, one line", AllocatePrefetchDistance);
157 }
158 }
159 if (PrefetchCopyIntervalInBytes > 0) {
160 tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes);
161 }
162 if (PrefetchScanIntervalInBytes > 0) {
163 tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes);
164 }
165 if (PrefetchFieldsAhead > 0) {
166 tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
167 }
168 }
169 #endif // PRODUCT
170 }
171
172 void VM_Version::print_features() {
173 tty->print_cr("Version:%s", cpu_features());
174 }
175
176 int VM_Version::determine_features() {
177 if (UseV8InstrsOnly) {
178 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-V8");)
179 return generic_v8_m;
180 }
181
182 int features = platform_features(unknown_m); // platform_features() is os_arch specific
183
184 if (features == unknown_m) {
185 features = generic_v9_m;
186 warning("Cannot recognize SPARC version. Default to V9");
187 }
188
189 assert(is_T_family(features) == is_niagara(features), "Niagara should be T series");
190 if (UseNiagaraInstrs) { // Force code generation for Niagara
191 if (is_T_family(features)) {
192 // Happy to accomodate...
193 } else {
194 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Niagara");)
195 features |= T_family_m;
196 }
197 } else {
198 if (is_T_family(features) && !FLAG_IS_DEFAULT(UseNiagaraInstrs)) {
199 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Not-Niagara");)
200 features &= ~(T_family_m | T1_model_m);
201 } else {
202 // Happy to accomodate...
203 }
204 }
205
206 return features;
207 }
208
209 static int saved_features = 0;
210
211 void VM_Version::allow_all() {
212 saved_features = _features;
213 _features = all_features_m;
214 }
215
216 void VM_Version::revert() {
217 _features = saved_features;
218 }
219
220 unsigned int VM_Version::calc_parallel_worker_threads() {
221 unsigned int result;
222 if (is_niagara_plus()) {
223 result = nof_parallel_worker_threads(5, 16, 8);
224 } else {
225 result = nof_parallel_worker_threads(5, 8, 8);
226 }
227 return result;
228 }