Mercurial > hg > truffle
annotate src/cpu/sparc/vm/vm_version_sparc.hpp @ 1914:ae065c367d93
6987135: Performance regression on Intel platform with 32-bits edition between 6u13 and 6u14.
Summary: Use hardware DIV instruction for long division by constant when it is faster than code with multiply.
Reviewed-by: never
author | kvn |
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date | Tue, 02 Nov 2010 09:00:37 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 class VM_Version: public Abstract_VM_Version { | |
26 protected: | |
27 enum Feature_Flag { | |
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28 v8_instructions = 0, |
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29 hardware_mul32 = 1, |
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30 hardware_div32 = 2, |
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31 hardware_fsmuld = 3, |
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32 hardware_popc = 4, |
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33 v9_instructions = 5, |
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34 vis1_instructions = 6, |
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35 vis2_instructions = 7, |
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36 sun4v_instructions = 8, |
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37 blk_init_instructions = 9, |
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38 fmaf_instructions = 10 |
0 | 39 }; |
40 | |
41 enum Feature_Flag_Set { | |
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42 unknown_m = 0, |
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43 all_features_m = -1, |
0 | 44 |
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45 v8_instructions_m = 1 << v8_instructions, |
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46 hardware_mul32_m = 1 << hardware_mul32, |
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47 hardware_div32_m = 1 << hardware_div32, |
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48 hardware_fsmuld_m = 1 << hardware_fsmuld, |
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49 hardware_popc_m = 1 << hardware_popc, |
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50 v9_instructions_m = 1 << v9_instructions, |
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51 vis1_instructions_m = 1 << vis1_instructions, |
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52 vis2_instructions_m = 1 << vis2_instructions, |
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53 sun4v_m = 1 << sun4v_instructions, |
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54 blk_init_instructions_m = 1 << blk_init_instructions, |
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55 fmaf_instructions_m = 1 << fmaf_instructions, |
0 | 56 |
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57 generic_v8_m = v8_instructions_m | hardware_mul32_m | hardware_div32_m | hardware_fsmuld_m, |
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58 generic_v9_m = generic_v8_m | v9_instructions_m, |
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59 ultra3_m = generic_v9_m | vis1_instructions_m | vis2_instructions_m, |
0 | 60 |
61 // Temporary until we have something more accurate | |
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62 niagara1_unique_m = sun4v_m, |
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63 niagara1_m = generic_v9_m | niagara1_unique_m |
0 | 64 }; |
65 | |
66 static int _features; | |
67 static const char* _features_str; | |
68 | |
69 static void print_features(); | |
70 static int determine_features(); | |
71 static int platform_features(int features); | |
72 | |
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73 static bool is_niagara1(int features) { return (features & sun4v_m) != 0; } |
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74 static bool is_sparc64(int features) { return (features & fmaf_instructions_m) != 0; } |
0 | 75 |
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76 static int maximum_niagara1_processor_count() { return 32; } |
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77 // Returns true if the platform is in the niagara line and |
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78 // newer than the niagara1. |
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79 static bool is_niagara1_plus(); |
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80 |
0 | 81 public: |
82 // Initialization | |
83 static void initialize(); | |
84 | |
85 // Instruction support | |
86 static bool has_v8() { return (_features & v8_instructions_m) != 0; } | |
87 static bool has_v9() { return (_features & v9_instructions_m) != 0; } | |
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88 static bool has_hardware_mul32() { return (_features & hardware_mul32_m) != 0; } |
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89 static bool has_hardware_div32() { return (_features & hardware_div32_m) != 0; } |
0 | 90 static bool has_hardware_fsmuld() { return (_features & hardware_fsmuld_m) != 0; } |
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91 static bool has_hardware_popc() { return (_features & hardware_popc_m) != 0; } |
0 | 92 static bool has_vis1() { return (_features & vis1_instructions_m) != 0; } |
93 static bool has_vis2() { return (_features & vis2_instructions_m) != 0; } | |
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94 static bool has_blk_init() { return (_features & blk_init_instructions_m) != 0; } |
0 | 95 |
96 static bool supports_compare_and_exchange() | |
97 { return has_v9(); } | |
98 | |
99 static bool is_ultra3() { return (_features & ultra3_m) == ultra3_m; } | |
100 static bool is_sun4v() { return (_features & sun4v_m) != 0; } | |
101 static bool is_niagara1() { return is_niagara1(_features); } | |
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102 static bool is_sparc64() { return is_sparc64(_features); } |
0 | 103 |
104 static bool has_fast_fxtof() { return has_v9() && !is_ultra3(); } | |
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105 static bool has_fast_idiv() { return is_niagara1_plus() || is_sparc64(); } |
0 | 106 |
107 static const char* cpu_features() { return _features_str; } | |
108 | |
109 static intx L1_data_cache_line_size() { | |
110 return 64; // default prefetch block size on sparc | |
111 } | |
112 | |
113 // Prefetch | |
114 static intx prefetch_copy_interval_in_bytes() { | |
115 intx interval = PrefetchCopyIntervalInBytes; | |
116 return interval >= 0 ? interval : (has_v9() ? 512 : 0); | |
117 } | |
118 static intx prefetch_scan_interval_in_bytes() { | |
119 intx interval = PrefetchScanIntervalInBytes; | |
120 return interval >= 0 ? interval : (has_v9() ? 512 : 0); | |
121 } | |
122 static intx prefetch_fields_ahead() { | |
123 intx count = PrefetchFieldsAhead; | |
124 return count >= 0 ? count : (is_ultra3() ? 1 : 0); | |
125 } | |
126 | |
127 static intx allocate_prefetch_distance() { | |
128 // This method should be called before allocate_prefetch_style(). | |
129 intx count = AllocatePrefetchDistance; | |
130 if (count < 0) { // default is not defined ? | |
131 count = 512; | |
132 } | |
133 return count; | |
134 } | |
135 static intx allocate_prefetch_style() { | |
136 assert(AllocatePrefetchStyle >= 0, "AllocatePrefetchStyle should be positive"); | |
137 // Return 0 if AllocatePrefetchDistance was not defined. | |
138 return AllocatePrefetchDistance > 0 ? AllocatePrefetchStyle : 0; | |
139 } | |
140 | |
141 // Legacy | |
142 static bool v8_instructions_work() { return has_v8() && !has_v9(); } | |
143 static bool v9_instructions_work() { return has_v9(); } | |
144 | |
145 // Assembler testing | |
146 static void allow_all(); | |
147 static void revert(); | |
148 | |
149 // Override the Abstract_VM_Version implementation. | |
150 static uint page_size_count() { return is_sun4v() ? 4 : 2; } | |
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151 |
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152 // Calculates the number of parallel threads |
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153 static unsigned int calc_parallel_worker_threads(); |
0 | 154 }; |