1 /*
2 * Copyright (c) 1997, 2017, 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 *
503
504 void VM_Version::determine_features() {
505 platform_features(); // platform_features() is os_arch specific.
506
507 assert(has_v9(), "must be");
508
509 if (UseNiagaraInstrs) { // Limit code generation to Niagara.
510 _features &= niagara1_msk;
511 }
512 }
513
514 static uint64_t saved_features = 0;
515
516 void VM_Version::allow_all() {
517 saved_features = _features;
518 _features = full_feature_msk;
519 }
520
521 void VM_Version::revert() {
522 _features = saved_features;
523 }
524
525 /* Determine a suitable number of threads on this particular machine.
526 *
527 * FIXME: Simply checking the processor family is insufficient.
528 */
529 unsigned int VM_Version::calc_parallel_worker_threads() {
530 const int num = 5;
531 const int den = is_post_niagara() ? 16 : 8;
532 const int threshold = 8;
533
534 return nof_parallel_worker_threads(num, den, threshold);
535 }
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1 /*
2 * Copyright (c) 1997, 2018, 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 *
503
504 void VM_Version::determine_features() {
505 platform_features(); // platform_features() is os_arch specific.
506
507 assert(has_v9(), "must be");
508
509 if (UseNiagaraInstrs) { // Limit code generation to Niagara.
510 _features &= niagara1_msk;
511 }
512 }
513
514 static uint64_t saved_features = 0;
515
516 void VM_Version::allow_all() {
517 saved_features = _features;
518 _features = full_feature_msk;
519 }
520
521 void VM_Version::revert() {
522 _features = saved_features;
523 }
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