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comparison src/share/vm/runtime/simpleThresholdPolicy.inline.hpp @ 1783:d5d065957597

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6953144: Tiered compilation Summary: Infrastructure for tiered compilation support (interpreter + c1 + c2) for 32 and 64 bit. Simple tiered policy implementation. Reviewed-by: kvn, never, phh, twisti
author iveresov
date Fri, 03 Sep 2010 17:51:07 -0700
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children f95d63e2154a
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1782:f353275af40e 1783:d5d065957597
1 /*
2 * Copyright (c) 2001, 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
26 template<CompLevel level>
27 bool SimpleThresholdPolicy::call_predicate_helper(int i, int b, double scale) {
28 switch(level) {
29 case CompLevel_none:
30 case CompLevel_limited_profile:
31 return (i > Tier3InvocationThreshold * scale) ||
32 (i > Tier3MinInvocationThreshold * scale && i + b > Tier3CompileThreshold * scale);
33 case CompLevel_full_profile:
34 return (i > Tier4InvocationThreshold * scale) ||
35 (i > Tier4MinInvocationThreshold * scale && i + b > Tier4CompileThreshold * scale);
36 }
37 return true;
38 }
39
40 template<CompLevel level>
41 bool SimpleThresholdPolicy::loop_predicate_helper(int i, int b, double scale) {
42 switch(level) {
43 case CompLevel_none:
44 case CompLevel_limited_profile:
45 return b > Tier3BackEdgeThreshold * scale;
46 case CompLevel_full_profile:
47 return b > Tier4BackEdgeThreshold * scale;
48 }
49 return true;
50 }
51
52 // Simple methods are as good being compiled with C1 as C2.
53 // Determine if a given method is such a case.
54 bool SimpleThresholdPolicy::is_trivial(methodOop method) {
55 if (method->is_accessor()) return true;
56 if (method->code() != NULL) {
57 methodDataOop mdo = method->method_data();
58 if (mdo != NULL && mdo->num_loops() == 0 &&
59 (method->code_size() < 5 || (mdo->num_blocks() < 4) && (method->code_size() < 15))) {
60 return !mdo->would_profile();
61 }
62 }
63 return false;
64 }