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7059037: Use BIS for zeroing on T4

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Use BIS for zeroing new allocated big (2Kb and more) objects and arrays.

Reviewed-by: never, twisti, ysr
This commit is contained in:
Vladimir Kozlov 2011-08-26 08:52:22 -07:00
parent 19f7fb98b8
commit 6446205688
14 changed files with 232 additions and 35 deletions
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4
hotspot/src/cpu/sparc/vm/vm_version_sparc.hpp
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@ -135,8 +135,8 @@ public:
// T4 and newer Sparc have fast RDPC instruction.
static bool has_fast_rdpc() { return is_T4(); }
// T4 and newer Sparc have Most-Recently-Used (MRU) BIS.
static bool has_mru_blk_init() { return has_blk_init() && is_T4(); }
// On T4 and newer Sparc BIS to the beginning of cache line always zeros it.
static bool has_block_zeroing() { return has_blk_init() && is_T4(); }
static const char* cpu_features() { return _features_str; }