1146 } else if (UseFastStosb) {
1147 warning("fast-string operations are not available on this CPU");
1148 FLAG_SET_DEFAULT(UseFastStosb, false);
1149 }
1150
1151 #ifdef COMPILER2
1152 if (FLAG_IS_DEFAULT(AlignVector)) {
1153 // Modern processors allow misaligned memory operations for vectors.
1154 AlignVector = !UseUnalignedLoadStores;
1155 }
1156 #endif // COMPILER2
1157
1158 if( AllocatePrefetchInstr == 3 && !supports_3dnow_prefetch() ) AllocatePrefetchInstr=0;
1159 if( !supports_sse() && supports_3dnow_prefetch() ) AllocatePrefetchInstr = 3;
1160
1161 // Allocation prefetch settings
1162 intx cache_line_size = prefetch_data_size();
1163 if( cache_line_size > AllocatePrefetchStepSize )
1164 AllocatePrefetchStepSize = cache_line_size;
1165
1166 assert(AllocatePrefetchLines > 0, "invalid value");
1167 if( AllocatePrefetchLines < 1 ) // set valid value in product VM
1168 AllocatePrefetchLines = 3;
1169 assert(AllocateInstancePrefetchLines > 0, "invalid value");
1170 if( AllocateInstancePrefetchLines < 1 ) // set valid value in product VM
1171 AllocateInstancePrefetchLines = 1;
1172
1173 AllocatePrefetchDistance = allocate_prefetch_distance();
1174 AllocatePrefetchStyle = allocate_prefetch_style();
1175
1176 if (is_intel() && cpu_family() == 6 && supports_sse3()) {
1177 if (AllocatePrefetchStyle == 2) { // watermark prefetching on Core
1178 #ifdef _LP64
1179 AllocatePrefetchDistance = 384;
1180 #else
1181 AllocatePrefetchDistance = 320;
1182 #endif
1183 }
1184 if (supports_sse4_2() && supports_ht()) { // Nehalem based cpus
1185 AllocatePrefetchDistance = 192;
1186 AllocatePrefetchLines = 4;
1187 }
1188 #ifdef COMPILER2
1189 if (supports_sse4_2()) {
1190 if (FLAG_IS_DEFAULT(UseFPUForSpilling)) {
1191 FLAG_SET_DEFAULT(UseFPUForSpilling, true);
1192 }
1193 }
1194 #endif
1195 }
1196
1197 #ifdef _LP64
1198 // Prefetch settings
1199 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
1200 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
1201 PrefetchFieldsAhead = prefetch_fields_ahead();
1202 #endif
1203
1204 if (FLAG_IS_DEFAULT(ContendedPaddingWidth) &&
1205 (cache_line_size > ContendedPaddingWidth))
1206 ContendedPaddingWidth = cache_line_size;
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1146 } else if (UseFastStosb) {
1147 warning("fast-string operations are not available on this CPU");
1148 FLAG_SET_DEFAULT(UseFastStosb, false);
1149 }
1150
1151 #ifdef COMPILER2
1152 if (FLAG_IS_DEFAULT(AlignVector)) {
1153 // Modern processors allow misaligned memory operations for vectors.
1154 AlignVector = !UseUnalignedLoadStores;
1155 }
1156 #endif // COMPILER2
1157
1158 if( AllocatePrefetchInstr == 3 && !supports_3dnow_prefetch() ) AllocatePrefetchInstr=0;
1159 if( !supports_sse() && supports_3dnow_prefetch() ) AllocatePrefetchInstr = 3;
1160
1161 // Allocation prefetch settings
1162 intx cache_line_size = prefetch_data_size();
1163 if( cache_line_size > AllocatePrefetchStepSize )
1164 AllocatePrefetchStepSize = cache_line_size;
1165
1166 AllocatePrefetchDistance = allocate_prefetch_distance();
1167 AllocatePrefetchStyle = allocate_prefetch_style();
1168
1169 if (is_intel() && cpu_family() == 6 && supports_sse3()) {
1170 if (AllocatePrefetchStyle == 2) { // watermark prefetching on Core
1171 #ifdef _LP64
1172 AllocatePrefetchDistance = 384;
1173 #else
1174 AllocatePrefetchDistance = 320;
1175 #endif
1176 }
1177 if (supports_sse4_2() && supports_ht()) { // Nehalem based cpus
1178 AllocatePrefetchDistance = 192;
1179 if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) {
1180 FLAG_SET_DEFAULT(AllocatePrefetchLines, 4);
1181 }
1182 }
1183 #ifdef COMPILER2
1184 if (supports_sse4_2()) {
1185 if (FLAG_IS_DEFAULT(UseFPUForSpilling)) {
1186 FLAG_SET_DEFAULT(UseFPUForSpilling, true);
1187 }
1188 }
1189 #endif
1190 }
1191
1192 #ifdef _LP64
1193 // Prefetch settings
1194 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
1195 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
1196 PrefetchFieldsAhead = prefetch_fields_ahead();
1197 #endif
1198
1199 if (FLAG_IS_DEFAULT(ContendedPaddingWidth) &&
1200 (cache_line_size > ContendedPaddingWidth))
1201 ContendedPaddingWidth = cache_line_size;
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