Tue, 15 May 2012 10:10:23 +0200
7133857: exp() and pow() should use the x87 ISA on x86
Summary: use x87 instructions to implement exp() and pow() in interpreter/c1/c2.
Reviewed-by: kvn, never, twisti
1 /*
2 * Copyright (c) 1998, 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
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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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #ifndef SHARE_VM_INTERPRETER_REWRITER_HPP
26 #define SHARE_VM_INTERPRETER_REWRITER_HPP
28 #include "memory/allocation.hpp"
29 #include "runtime/handles.inline.hpp"
30 #include "utilities/growableArray.hpp"
32 // The Rewriter adds caches to the constant pool and rewrites bytecode indices
33 // pointing into the constant pool for better interpreter performance.
35 class Rewriter: public StackObj {
36 private:
37 instanceKlassHandle _klass;
38 constantPoolHandle _pool;
39 objArrayHandle _methods;
40 intArray _cp_map;
41 intStack _cp_cache_map;
42 bool _have_invoke_dynamic;
44 void init_cp_map(int length) {
45 _cp_map.initialize(length, -1);
46 // Choose an initial value large enough that we don't get frequent
47 // calls to grow().
48 _cp_cache_map.initialize(length / 2);
49 }
50 int cp_entry_to_cp_cache(int i) { assert(has_cp_cache(i), "oob"); return _cp_map[i]; }
51 bool has_cp_cache(int i) { return (uint)i < (uint)_cp_map.length() && _cp_map[i] >= 0; }
52 int maybe_add_cp_cache_entry(int i) { return has_cp_cache(i) ? _cp_map[i] : add_cp_cache_entry(i); }
53 int add_cp_cache_entry(int cp_index) {
54 assert((cp_index & _secondary_entry_tag) == 0, "bad tag");
55 assert(_cp_map[cp_index] == -1, "not twice on same cp_index");
56 int cache_index = _cp_cache_map.append(cp_index);
57 _cp_map.at_put(cp_index, cache_index);
58 assert(cp_entry_to_cp_cache(cp_index) == cache_index, "");
59 return cache_index;
60 }
61 int add_secondary_cp_cache_entry(int main_cpc_entry) {
62 assert(main_cpc_entry < _cp_cache_map.length(), "must be earlier CP cache entry");
63 int cache_index = _cp_cache_map.append(main_cpc_entry | _secondary_entry_tag);
64 return cache_index;
65 }
67 // Access the contents of _cp_cache_map to determine CP cache layout.
68 int cp_cache_entry_pool_index(int cache_index) {
69 int cp_index = _cp_cache_map[cache_index];
70 if ((cp_index & _secondary_entry_tag) != 0)
71 return -1;
72 else
73 return cp_index;
74 }
75 int cp_cache_secondary_entry_main_index(int cache_index) {
76 int cp_index = _cp_cache_map[cache_index];
77 if ((cp_index & _secondary_entry_tag) == 0)
78 return -1;
79 else
80 return (cp_index - _secondary_entry_tag);
81 }
83 // All the work goes in here:
84 Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS);
86 void compute_index_maps();
87 void make_constant_pool_cache(TRAPS);
88 void scan_method(methodOop m, bool reverse = false);
89 void rewrite_Object_init(methodHandle m, TRAPS);
90 void rewrite_member_reference(address bcp, int offset, bool reverse = false);
91 void rewrite_invokedynamic(address bcp, int offset, bool reverse = false);
92 void maybe_rewrite_ldc(address bcp, int offset, bool is_wide, bool reverse = false);
93 // Revert bytecodes in case of an exception.
94 void restore_bytecodes();
96 static methodHandle rewrite_jsrs(methodHandle m, TRAPS);
97 public:
98 // Driver routine:
99 static void rewrite(instanceKlassHandle klass, TRAPS);
100 static void rewrite(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS);
102 enum {
103 _secondary_entry_tag = nth_bit(30)
104 };
106 // Second pass, not gated by is_rewritten flag
107 static void relocate_and_link(instanceKlassHandle klass, TRAPS);
108 // JSR292 version to call with it's own methods.
109 static void relocate_and_link(instanceKlassHandle klass,
110 objArrayHandle methods, TRAPS);
112 };
114 #endif // SHARE_VM_INTERPRETER_REWRITER_HPP