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8005522: use fast-string instructions on x86 for zeroing

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Use 'rep stosb' instead of 'rep stosq' when fast-string operations are available.

Reviewed-by: twisti, roland
This commit is contained in:
Vladimir Kozlov 2013-01-03 15:09:55 -08:00
parent 73d6d417be
commit cfcd28fd9d
10 changed files with 95 additions and 22 deletions
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4
hotspot/src/share/vm/opto/memnode.cpp
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@ -2725,10 +2725,8 @@ Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest,
zend = phase->transform( new(C) URShiftXNode(zend, shift) );
}
Node* zsize = phase->transform( new(C) SubXNode(zend, zbase) );
Node* zinit = phase->zerocon((unit == BytesPerLong) ? T_LONG : T_INT);
// Bulk clear double-words
Node* zsize = phase->transform( new(C) SubXNode(zend, zbase) );
Node* adr = phase->transform( new(C) AddPNode(dest, dest, start_offset) );
mem = new (C) ClearArrayNode(ctl, mem, zsize, adr);
return phase->transform(mem);