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 28 int VM_Version::_features = VM_Version::unknown_m; 29 const char* VM_Version::_features_str = ""; 30 31 bool 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 37 void 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 } 162 163 void VM_Version::print_features() { 164 tty->print_cr("Version:%s", cpu_features()); 165 } 166 167 int 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 } 198 199 static int saved_features = 0; 200 201 void VM_Version::allow_all() { 202 saved_features = _features; 203 _features = all_features_m; 204 } 205 206 void VM_Version::revert() { 207 _features = saved_features; 208 } 209 210 unsigned 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 }