1 /*
2 * Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2020 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
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24 */
25
26 #ifndef CPU_PPC_GLOBALS_PPC_HPP
27 #define CPU_PPC_GLOBALS_PPC_HPP
28
29 #include "utilities/globalDefinitions.hpp"
30 #include "utilities/macros.hpp"
31
32 // Sets the default values for platform dependent flags used by the runtime system.
33 // (see globals.hpp)
34
35 define_pd_global(bool, ImplicitNullChecks, true); // Generate code for implicit null checks.
36 define_pd_global(bool, TrapBasedNullChecks, true);
37 define_pd_global(bool, UncommonNullCast, true); // Uncommon-trap NULLs passed to check cast.
38
39 #define DEFAULT_STACK_YELLOW_PAGES (2)
40 #define DEFAULT_STACK_RED_PAGES (1)
41 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
42 // stack if compiled for unix and LP64. To pass stack overflow tests we need
43 // 20 shadow pages.
44 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+2))
45 #define DEFAULT_STACK_RESERVED_PAGES (1)
46
47 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
48 #define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES
49 #define MIN_STACK_SHADOW_PAGES (3 DEBUG_ONLY(+1))
50 #define MIN_STACK_RESERVED_PAGES (0)
51
52 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
53 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
54 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
55 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
56
57 // Use large code-entry alignment.
58 define_pd_global(uintx, CodeCacheSegmentSize, 128);
59 define_pd_global(intx, CodeEntryAlignment, 128);
60 define_pd_global(intx, OptoLoopAlignment, 16);
61 define_pd_global(intx, InlineSmallCode, 1500);
62
63 // Flags for template interpreter.
64 define_pd_global(bool, RewriteBytecodes, true);
65 define_pd_global(bool, RewriteFrequentPairs, true);
66
67 define_pd_global(bool, PreserveFramePointer, false);
68
69 define_pd_global(uintx, TypeProfileLevel, 111);
70
71 define_pd_global(bool, CompactStrings, true);
72
73 // 2x unrolled loop is shorter with more than 9 HeapWords.
74 define_pd_global(intx, InitArrayShortSize, 9*BytesPerLong);
75
76 // Platform dependent flag handling: flags only defined on this platform.
77 #define ARCH_FLAGS(develop, \
78 product, \
79 notproduct, \
80 range, \
81 constraint) \
82 \
83 product(uintx, PowerArchitecturePPC64, 0, DIAGNOSTIC, \
84 "Specify the PowerPC family version in use. If not provided, " \
85 "HotSpot will determine it automatically. Host family version " \
86 "is the maximum value allowed (instructions are not emulated).") \
87 \
88 /* Reoptimize code-sequences of calls at runtime, e.g. replace an */ \
89 /* indirect call by a direct call. */ \
90 product(bool, ReoptimizeCallSequences, true, DIAGNOSTIC, \
91 "Reoptimize code-sequences of calls at runtime.") \
92 \
93 /* Power 8: Configure Data Stream Control Register. */ \
94 product(uint64_t, DSCR_PPC64, (uint64_t)-1, \
95 "Power8 or later: Specify encoded value for Data Stream Control " \
96 "Register") \
97 product(uint64_t, DSCR_DPFD_PPC64, 8, \
98 "Power8 or later: DPFD (default prefetch depth) value of the " \
99 "Data Stream Control Register." \
100 " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch") \
101 product(uint64_t, DSCR_URG_PPC64, 8, \
102 "Power8 or later: URG (depth attainment urgency) value of the " \
103 "Data Stream Control Register." \
104 " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch") \
105 \
106 product(bool, UseLoadInstructionsForStackBangingPPC64, false, DIAGNOSTIC, \
107 "Use load instructions for stack banging.") \
108 \
109 product(bool, UseStaticBranchPredictionInCompareAndSwapPPC64, true, DIAGNOSTIC,\
110 "Use static branch prediction hints in CAS operations.") \
111 product(bool, UseStaticBranchPredictionForUncommonPathsPPC64, false, DIAGNOSTIC,\
112 "Use static branch prediction hints for uncommon paths.") \
113 \
114 /* special instructions */ \
115 product(bool, SuperwordUseVSX, false, \
116 "Use Power8 VSX instructions for superword optimization.") \
117 \
118 product(bool, UseByteReverseInstructions, false, DIAGNOSTIC, \
119 "Use byte reverse instructions.") \
120 \
121 product(bool, UseVectorByteReverseInstructionsPPC64, false, DIAGNOSTIC, \
122 "Use Power9 xxbr* vector byte reverse instructions.") \
123 \
124 product(bool, UseCountLeadingZerosInstructionsPPC64, true, DIAGNOSTIC, \
125 "Use count leading zeros instructions.") \
126 \
127 product(bool, UseCountTrailingZerosInstructionsPPC64, false, DIAGNOSTIC, \
128 "Use count trailing zeros instructions.") \
129 \
130 product(bool, UseExtendedLoadAndReserveInstructionsPPC64, false, DIAGNOSTIC,\
131 "Use extended versions of load-and-reserve instructions.") \
132 \
133 product(bool, UseRotateAndMaskInstructionsPPC64, true, DIAGNOSTIC, \
134 "Use rotate and mask instructions.") \
135 \
136 /* Trap based checks. */ \
137 /* Trap based checks use the ppc trap instructions to check certain */ \
138 /* conditions. This instruction raises a SIGTRAP caught by the */ \
139 /* exception handler of the VM. */ \
140 product(bool, UseSIGTRAP, true, \
141 "Allow trap instructions that make use of SIGTRAP. Use this to " \
142 "switch off all optimizations requiring SIGTRAP.") \
143 product(bool, TrapBasedICMissChecks, true, DIAGNOSTIC, \
144 "Raise and handle SIGTRAP if inline cache miss detected.") \
145 \
146 product(bool, TraceTraps, false, DIAGNOSTIC, \
147 "Trace all traps the signal handler handles.") \
148 \
149 develop(bool, ZapMemory, false, \
150 "Write 0x0101... to empty memory. Use this to ease debugging.") \
151 \
152 /* Use Restricted Transactional Memory for lock elision */ \
153 product(bool, UseRTMLocking, false, \
154 "Enable RTM lock eliding for inflated locks in compiled code") \
155 \
156 product(bool, UseRTMForStackLocks, false, EXPERIMENTAL, \
157 "Enable RTM lock eliding for stack locks in compiled code") \
158 \
159 product(bool, UseRTMDeopt, false, \
160 "Perform deopt and recompilation based on RTM abort ratio") \
161 \
162 product(int, RTMRetryCount, 5, \
163 "Number of RTM retries on lock abort or busy") \
164 range(0, max_jint) \
165 \
166 product(int, RTMSpinLoopCount, 100, EXPERIMENTAL, \
167 "Spin count for lock to become free before RTM retry") \
168 range(0, 32767) /* immediate operand limit on ppc */ \
169 \
170 product(int, RTMAbortThreshold, 1000, EXPERIMENTAL, \
171 "Calculate abort ratio after this number of aborts") \
172 range(0, max_jint) \
173 \
174 product(int, RTMLockingThreshold, 10000, EXPERIMENTAL, \
175 "Lock count at which to do RTM lock eliding without " \
176 "abort ratio calculation") \
177 range(0, max_jint) \
178 \
179 product(int, RTMAbortRatio, 50, EXPERIMENTAL, \
180 "Lock abort ratio at which to stop use RTM lock eliding") \
181 range(0, 100) /* natural range */ \
182 \
183 product(int, RTMTotalCountIncrRate, 64, EXPERIMENTAL, \
184 "Increment total RTM attempted lock count once every n times") \
185 range(1, 32767) /* immediate operand limit on ppc */ \
186 constraint(RTMTotalCountIncrRateConstraintFunc,AfterErgo) \
187 \
188 product(intx, RTMLockingCalculationDelay, 0, EXPERIMENTAL, \
189 "Number of milliseconds to wait before start calculating aborts " \
190 "for RTM locking") \
191 \
192 product(bool, UseRTMXendForLockBusy, true, EXPERIMENTAL, \
193 "Use RTM Xend instead of Xabort when lock busy")
194
195 // end of ARCH_FLAGS
196
197 #endif // CPU_PPC_GLOBALS_PPC_HPP