1 /*
2 * Copyright (c) 2000, 2024, 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.
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23 */
24
25 #ifndef CPU_X86_GLOBALS_X86_HPP
26 #define CPU_X86_GLOBALS_X86_HPP
27
28 #include "utilities/globalDefinitions.hpp"
29 #include "utilities/macros.hpp"
30
31 // Sets the default values for platform dependent flags used by the runtime system.
32 // (see globals.hpp)
33
34 define_pd_global(bool, ImplicitNullChecks, true); // Generate code for implicit null checks
35 define_pd_global(bool, TrapBasedNullChecks, false); // Not needed on x86.
36 define_pd_global(bool, UncommonNullCast, true); // Uncommon-trap nulls passed to check cast
37
38 define_pd_global(bool, DelayCompilerStubsGeneration, COMPILER2_OR_JVMCI);
39
40 define_pd_global(uintx, CodeCacheSegmentSize, 64 COMPILER1_AND_COMPILER2_PRESENT(+64)); // Tiered compilation has large code-entry alignment.
41 // See 4827828 for this change. There is no globals_core_i486.hpp. I can't
42 // assign a different value for C2 without touching a number of files. Use
43 // #ifdef to minimize the change as it's late in Mantis. -- FIXME.
44 // c1 doesn't have this problem because the fix to 4858033 assures us
45 // the vep is aligned at CodeEntryAlignment whereas c2 only aligns
46 // the uep and the vep doesn't get real alignment but just slops on by
47 // only assured that the entry instruction meets the 5 byte size requirement.
48 #if COMPILER2_OR_JVMCI
49 define_pd_global(intx, CodeEntryAlignment, 32);
50 #else
51 define_pd_global(intx, CodeEntryAlignment, 16);
52 #endif // COMPILER2_OR_JVMCI
53 define_pd_global(intx, OptoLoopAlignment, 16);
54 define_pd_global(intx, InlineSmallCode, 1000);
55
56 #define DEFAULT_STACK_YELLOW_PAGES (NOT_WINDOWS(2) WINDOWS_ONLY(3))
57 #define DEFAULT_STACK_RED_PAGES (1)
58 #define DEFAULT_STACK_RESERVED_PAGES (NOT_WINDOWS(1) WINDOWS_ONLY(0))
59
60 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
61 #define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES
62 #define MIN_STACK_RESERVED_PAGES (0)
63
64 #ifdef _LP64
65 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
66 // stack if compiled for unix and LP64. To pass stack overflow tests we need
67 // 20 shadow pages.
68 #define DEFAULT_STACK_SHADOW_PAGES (NOT_WIN64(20) WIN64_ONLY(8) DEBUG_ONLY(+4))
69 // For those clients that do not use write socket, we allow
70 // the min range value to be below that of the default
71 #define MIN_STACK_SHADOW_PAGES (NOT_WIN64(10) WIN64_ONLY(8) DEBUG_ONLY(+4))
72 #else
73 #define DEFAULT_STACK_SHADOW_PAGES (4 DEBUG_ONLY(+5))
74 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
75 #endif // _LP64
76
77 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
78 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
79 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
80 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
81
82 #ifdef _LP64
83 define_pd_global(bool, VMContinuations, true);
84 #else
85 define_pd_global(bool, VMContinuations, false);
86 #endif
87
88 define_pd_global(bool, RewriteBytecodes, true);
89 define_pd_global(bool, RewriteFrequentPairs, true);
90
91 define_pd_global(uintx, TypeProfileLevel, 111);
92
93 define_pd_global(bool, CompactStrings, true);
94
95 define_pd_global(bool, PreserveFramePointer, false);
96
97 define_pd_global(intx, InitArrayShortSize, 8*BytesPerLong);
98
99 #define ARCH_FLAGS(develop, \
100 product, \
101 range, \
102 constraint) \
103 \
104 develop(bool, IEEEPrecision, true, \
105 "Enables IEEE precision (for INTEL only)") \
106 \
107 product(bool, UseStoreImmI16, true, \
108 "Use store immediate 16-bits value instruction on x86") \
109 \
110 product(int, UseSSE, 4, \
111 "Highest supported SSE instructions set on x86/x64") \
112 range(0, 4) \
113 \
114 product(int, UseAVX, 3, \
115 "Highest supported AVX instructions set on x86/x64") \
116 range(0, 3) \
117 \
118 product(bool, UseKNLSetting, false, DIAGNOSTIC, \
119 "Control whether Knights platform setting should be used") \
120 \
121 product(bool, UseCLMUL, false, \
122 "Control whether CLMUL instructions can be used on x86/x64") \
123 \
124 product(bool, UseIncDec, true, DIAGNOSTIC, \
125 "Use INC, DEC instructions on x86") \
126 \
127 product(bool, UseNewLongLShift, false, \
128 "Use optimized bitwise shift left") \
129 \
130 product(bool, UseAddressNop, false, \
131 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
132 \
133 product(bool, UseXmmLoadAndClearUpper, true, \
134 "Load low part of XMM register and clear upper part") \
135 \
136 product(bool, UseXmmRegToRegMoveAll, false, \
137 "Copy all XMM register bits when moving value between registers") \
138 \
139 product(bool, UseXmmI2D, false, \
140 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
141 \
142 product(bool, UseXmmI2F, false, \
143 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
144 \
145 product(bool, UseUnalignedLoadStores, false, \
146 "Use SSE2 MOVDQU instruction for Arraycopy") \
147 \
148 product(bool, UseXMMForObjInit, false, \
149 "Use XMM/YMM MOVDQU instruction for Object Initialization") \
150 \
151 product(bool, UseFastStosb, false, \
152 "Use fast-string operation for zeroing: rep stosb") \
153 \
154 /* Use Restricted Transactional Memory for lock eliding */ \
155 product(bool, UseRTMLocking, false, \
156 "(Deprecated) Enable RTM lock eliding for inflated locks " \
157 "in compiled code") \
158 \
159 product(bool, UseRTMForStackLocks, false, EXPERIMENTAL, \
160 "Enable RTM lock eliding for stack locks in compiled code") \
161 \
162 product(bool, UseRTMDeopt, false, \
163 "(Deprecated) Perform deopt and recompilation based on " \
164 "RTM abort ratio") \
165 \
166 product(int, RTMRetryCount, 5, \
167 "(Deprecated) Number of RTM retries on lock abort or busy") \
168 range(0, max_jint) \
169 \
170 product(int, RTMSpinLoopCount, 100, EXPERIMENTAL, \
171 "Spin count for lock to become free before RTM retry") \
172 range(0, max_jint) \
173 \
174 product(int, RTMAbortThreshold, 1000, EXPERIMENTAL, \
175 "Calculate abort ratio after this number of aborts") \
176 range(0, max_jint) \
177 \
178 product(int, RTMLockingThreshold, 10000, EXPERIMENTAL, \
179 "Lock count at which to do RTM lock eliding without " \
180 "abort ratio calculation") \
181 range(0, max_jint) \
182 \
183 product(int, RTMAbortRatio, 50, EXPERIMENTAL, \
184 "Lock abort ratio at which to stop use RTM lock eliding") \
185 range(0, 100) /* natural range */ \
186 \
187 product(int, RTMTotalCountIncrRate, 64, EXPERIMENTAL, \
188 "Increment total RTM attempted lock count once every n times") \
189 range(1, max_jint) \
190 constraint(RTMTotalCountIncrRateConstraintFunc,AfterErgo) \
191 \
192 product(intx, RTMLockingCalculationDelay, 0, EXPERIMENTAL, \
193 "Number of milliseconds to wait before start calculating aborts " \
194 "for RTM locking") \
195 \
196 product(bool, UseRTMXendForLockBusy, true, EXPERIMENTAL, \
197 "Use RTM Xend instead of Xabort when lock busy") \
198 \
199 /* assembler */ \
200 product(bool, UseCountLeadingZerosInstruction, false, \
201 "Use count leading zeros instruction") \
202 \
203 product(bool, UseCountTrailingZerosInstruction, false, \
204 "Use count trailing zeros instruction") \
205 \
206 product(bool, UseSSE42Intrinsics, false, \
207 "SSE4.2 versions of intrinsics") \
208 \
209 product(bool, UseBMI1Instructions, false, \
210 "Use BMI1 instructions") \
211 \
212 product(bool, UseBMI2Instructions, false, \
213 "Use BMI2 instructions") \
214 \
215 product(bool, UseLibmIntrinsic, true, DIAGNOSTIC, \
216 "Use Libm Intrinsics") \
217 \
218 /* Autodetected, see vm_version_x86.cpp */ \
219 product(bool, EnableX86ECoreOpts, false, DIAGNOSTIC, \
220 "Perform Ecore Optimization") \
221 \
222 /* Minimum array size in bytes to use AVX512 intrinsics */ \
223 /* for copy, inflate and fill which don't bail out early based on any */ \
224 /* condition. When this value is set to zero compare operations like */ \
225 /* compare, vectorizedMismatch, compress can also use AVX512 intrinsics.*/\
226 product(int, AVX3Threshold, 4096, DIAGNOSTIC, \
227 "Minimum array size in bytes to use AVX512 intrinsics" \
228 "for copy, inflate and fill. When this value is set as zero" \
229 "compare operations can also use AVX512 intrinsics.") \
230 range(0, max_jint) \
231 constraint(AVX3ThresholdConstraintFunc,AfterErgo) \
232 \
233 product(bool, IntelJccErratumMitigation, true, DIAGNOSTIC, \
234 "Turn off JVM mitigations related to Intel micro code " \
235 "mitigations for the Intel JCC erratum")
236
237 // end of ARCH_FLAGS
238
239 #endif // CPU_X86_GLOBALS_X86_HPP