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6912521: System.arraycopy works slower than the simple loop for little lengths

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Convert small array copies to series of loads and stores

Reviewed-by: kvn, vlivanov
This commit is contained in:
Roland Westrelin 2015-02-18 18:14:07 +01:00
parent c71eca0cbf
commit 88848bd9e8
11 changed files with 1440 additions and 327 deletions
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3
hotspot/src/share/vm/opto/macroArrayCopy.cpp
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@ -23,6 +23,7 @@
*/
#include "precompiled.hpp"
#include "opto/arraycopynode.hpp"
#include "oops/objArrayKlass.hpp"
#include "opto/convertnode.hpp"
#include "opto/graphKit.hpp"
@ -519,7 +520,7 @@ Node* PhaseMacroExpand::generate_arraycopy(ArrayCopyNode *ac, AllocateArrayNode*
// Test S[] against D[], not S against D, because (probably)
// the secondary supertype cache is less busy for S[] than S.
// This usually only matters when D is an interface.
Node* not_subtype_ctrl = ac->is_arraycopy_validated() ? top() :
Node* not_subtype_ctrl = (ac->is_arraycopy_validated() || ac->is_copyof_validated() || ac->is_copyofrange_validated()) ? top() :
Phase::gen_subtype_check(src_klass, dest_klass, ctrl, mem, &_igvn);
// Plug failing path into checked_oop_disjoint_arraycopy
if (not_subtype_ctrl != top()) {