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comparison src/cpu/sparc/vm/vm_version_sparc.cpp @ 675:f6da6f0174ac

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6821700: tune VM flags for peak performance Summary: Tune C2 flags default values for performance. Reviewed-by: never, phh, iveresov, jmasa, ysr
author kvn
date Mon, 30 Mar 2009 18:19:31 -0700
parents c771b7f43bbf
children 6476042f815c
comparison
equal deleted inserted replaced
674:4948e7dd28dc 675:f6da6f0174ac
60 _supports_cx8 = has_v9(); 60 _supports_cx8 = has_v9();
61 61
62 if (is_niagara1()) { 62 if (is_niagara1()) {
63 // Indirect branch is the same cost as direct 63 // Indirect branch is the same cost as direct
64 if (FLAG_IS_DEFAULT(UseInlineCaches)) { 64 if (FLAG_IS_DEFAULT(UseInlineCaches)) {
65 UseInlineCaches = false; 65 FLAG_SET_DEFAULT(UseInlineCaches, false);
66 } 66 }
67 #ifdef _LP64 67 #ifdef _LP64
68 // Single issue niagara1 is slower for CompressedOops 68 // Single issue niagara1 is slower for CompressedOops
69 // but niagaras after that it's fine. 69 // but niagaras after that it's fine.
70 if (!is_niagara1_plus()) { 70 if (!is_niagara1_plus()) {
77 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 77 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
78 #endif // _LP64 78 #endif // _LP64
79 #ifdef COMPILER2 79 #ifdef COMPILER2
80 // Indirect branch is the same cost as direct 80 // Indirect branch is the same cost as direct
81 if (FLAG_IS_DEFAULT(UseJumpTables)) { 81 if (FLAG_IS_DEFAULT(UseJumpTables)) {
82 UseJumpTables = true; 82 FLAG_SET_DEFAULT(UseJumpTables, true);
83 } 83 }
84 // Single-issue, so entry and loop tops are 84 // Single-issue, so entry and loop tops are
85 // aligned on a single instruction boundary 85 // aligned on a single instruction boundary
86 if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) { 86 if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
87 InteriorEntryAlignment = 4; 87 FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);
88 } 88 }
89 if (FLAG_IS_DEFAULT(OptoLoopAlignment)) { 89 if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
90 OptoLoopAlignment = 4; 90 FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
91 }
92 if (is_niagara1_plus() && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
93 // Use smaller prefetch distance on N2
94 FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
91 } 95 }
92 #endif 96 #endif
93 } 97 }
94 98
95 // Use hardware population count instruction if available. 99 // Use hardware population count instruction if available.
96 if (has_hardware_popc()) { 100 if (has_hardware_popc()) {
97 if (FLAG_IS_DEFAULT(UsePopCountInstruction)) { 101 if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
98 UsePopCountInstruction = true; 102 FLAG_SET_DEFAULT(UsePopCountInstruction, true);
99 } 103 }
100 } 104 }
101 105
102 char buf[512]; 106 char buf[512];
103 jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s", 107 jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s",