equal
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104 } |
104 } |
105 // Align loops on a single instruction boundary. |
105 // Align loops on a single instruction boundary. |
106 if (FLAG_IS_DEFAULT(OptoLoopAlignment)) { |
106 if (FLAG_IS_DEFAULT(OptoLoopAlignment)) { |
107 FLAG_SET_DEFAULT(OptoLoopAlignment, 4); |
107 FLAG_SET_DEFAULT(OptoLoopAlignment, 4); |
108 } |
108 } |
109 // When using CMS, we cannot use memset() in BOT updates because |
109 // When using CMS or G1, we cannot use memset() in BOT updates |
110 // the sun4v/CMT version in libc_psr uses BIS which exposes |
110 // because the sun4v/CMT version in libc_psr uses BIS which |
111 // "phantom zeros" to concurrent readers. See 6948537. |
111 // exposes "phantom zeros" to concurrent readers. See 6948537. |
112 if (FLAG_IS_DEFAULT(UseMemSetInBOT) && UseConcMarkSweepGC) { |
112 if (FLAG_IS_DEFAULT(UseMemSetInBOT) && (UseConcMarkSweepGC || UseG1GC)) { |
113 FLAG_SET_DEFAULT(UseMemSetInBOT, false); |
113 FLAG_SET_DEFAULT(UseMemSetInBOT, false); |
114 } |
114 } |
115 #ifdef _LP64 |
115 #ifdef _LP64 |
116 // 32-bit oops don't make sense for the 64-bit VM on sparc |
116 // 32-bit oops don't make sense for the 64-bit VM on sparc |
117 // since the 32-bit VM has the same registers and smaller objects. |
117 // since the 32-bit VM has the same registers and smaller objects. |