1 /*
2 * Copyright (c) 2002, 2024, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2023 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_pd_global(bool, DelayCompilerStubsGeneration, COMPILER2_OR_JVMCI);
40
41 #define DEFAULT_STACK_YELLOW_PAGES (2)
42 #define DEFAULT_STACK_RED_PAGES (1)
43 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
44 // stack if compiled for unix and LP64. To pass stack overflow tests we need
45 // 20 shadow pages.
46 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+2))
47 #define DEFAULT_STACK_RESERVED_PAGES (1)
48
49 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
50 #define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES
51 #define MIN_STACK_SHADOW_PAGES (3 DEBUG_ONLY(+1))
52 #define MIN_STACK_RESERVED_PAGES (0)
53
54 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
55 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
56 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
57 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
58
59 define_pd_global(bool, VMContinuations, true);
60
61 // Use large code-entry alignment.
62 define_pd_global(uintx, CodeCacheSegmentSize, 128);
63 define_pd_global(intx, CodeEntryAlignment, 64);
64 define_pd_global(intx, OptoLoopAlignment, 16);
65 define_pd_global(intx, InlineSmallCode, 1500);
66
67 // Flags for template interpreter.
68 define_pd_global(bool, RewriteBytecodes, true);
69 define_pd_global(bool, RewriteFrequentPairs, true);
70
71 define_pd_global(bool, PreserveFramePointer, false);
72
73 define_pd_global(uintx, TypeProfileLevel, 111);
74
75 define_pd_global(bool, CompactStrings, true);
76
77 // 2x unrolled loop is shorter with more than 9 HeapWords.
78 define_pd_global(intx, InitArrayShortSize, 9*BytesPerLong);
79
80 // Platform dependent flag handling: flags only defined on this platform.
81 #define ARCH_FLAGS(develop, \
82 product, \
83 range, \
84 constraint) \
85 \
86 product(uintx, PowerArchitecturePPC64, 0, DIAGNOSTIC, \
87 "Specify the PowerPC family version in use. If not provided, " \
88 "HotSpot will determine it automatically. Host family version " \
89 "is the maximum value allowed (instructions are not emulated).") \
90 \
91 /* Reoptimize code-sequences of calls at runtime, e.g. replace an */ \
92 /* indirect call by a direct call. */ \
93 product(bool, ReoptimizeCallSequences, true, DIAGNOSTIC, \
94 "Reoptimize code-sequences of calls at runtime.") \
95 \
96 /* Power 8: Configure Data Stream Control Register. */ \
97 product(uint64_t, DSCR_PPC64, (uint64_t)-1, \
98 "Power8 or later: Specify encoded value for Data Stream Control " \
99 "Register") \
100 product(uint64_t, DSCR_DPFD_PPC64, 8, \
101 "Power8 or later: DPFD (default prefetch depth) value of the " \
102 "Data Stream Control Register." \
103 " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch") \
104 product(uint64_t, DSCR_URG_PPC64, 8, \
105 "Power8 or later: URG (depth attainment urgency) value of the " \
106 "Data Stream Control Register." \
107 " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch") \
108 \
109 product(bool, UseLoadInstructionsForStackBangingPPC64, false, DIAGNOSTIC, \
110 "Use load instructions for stack banging.") \
111 \
112 product(bool, UseStaticBranchPredictionInCompareAndSwapPPC64, true, DIAGNOSTIC,\
113 "Use static branch prediction hints in CAS operations.") \
114 product(bool, UseStaticBranchPredictionForUncommonPathsPPC64, false, DIAGNOSTIC,\
115 "Use static branch prediction hints for uncommon paths.") \
116 \
117 /* special instructions */ \
118 product(bool, SuperwordUseVSX, false, \
119 "Use Power8 VSX instructions for superword optimization.") \
120 \
121 product(bool, UseByteReverseInstructions, false, DIAGNOSTIC, \
122 "Use byte reverse instructions.") \
123 \
124 product(bool, UseVectorByteReverseInstructionsPPC64, false, DIAGNOSTIC, \
125 "Use Power9 xxbr* vector byte reverse instructions.") \
126 \
127 product(bool, UseCountLeadingZerosInstructionsPPC64, true, DIAGNOSTIC, \
128 "Use count leading zeros instructions.") \
129 \
130 product(bool, UseCountTrailingZerosInstructionsPPC64, false, DIAGNOSTIC, \
131 "Use count trailing zeros instructions.") \
132 \
133 product(bool, UseExtendedLoadAndReserveInstructionsPPC64, false, DIAGNOSTIC,\
134 "Use extended versions of load-and-reserve instructions.") \
135 \
136 product(bool, UseRotateAndMaskInstructionsPPC64, true, DIAGNOSTIC, \
137 "Use rotate and mask instructions.") \
138 \
139 /* Trap based checks. */ \
140 /* Trap based checks use the ppc trap instructions to check certain */ \
141 /* conditions. This instruction raises a SIGTRAP caught by the */ \
142 /* exception handler of the VM. */ \
143 product(bool, UseSIGTRAP, true, \
144 "Allow trap instructions that make use of SIGTRAP. Use this to " \
145 "switch off all optimizations requiring SIGTRAP.") \
146 product(bool, TrapBasedICMissChecks, true, DIAGNOSTIC, \
147 "Raise and handle SIGTRAP if inline cache miss detected.") \
148 \
149 product(bool, TraceTraps, false, DIAGNOSTIC, \
150 "Trace all traps the signal handler handles.") \
151 \
152 develop(bool, ZapMemory, false, \
153 "Write 0x0101... to empty memory. Use this to ease debugging.")
154
155 // end of ARCH_FLAGS
156
157 #endif // CPU_PPC_GLOBALS_PPC_HPP