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6940726: Use BIS instruction for allocation prefetch on Sparc

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Use BIS instruction for allocation prefetch on Sparc

Reviewed-by: twisti
This commit is contained in:
Vladimir Kozlov 2010-04-07 12:39:27 -07:00
parent 629d139cac
commit f6934fd3b7
6 changed files with 93 additions and 7 deletions
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41
hotspot/src/share/vm/opto/macro.cpp
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@ -1487,11 +1487,11 @@ Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false,
Node*& contended_phi_rawmem,
Node* old_eden_top, Node* new_eden_top,
Node* length) {
enum { fall_in_path = 1, pf_path = 2 };
if( UseTLAB && AllocatePrefetchStyle == 2 ) {
// Generate prefetch allocation with watermark check.
// As an allocation hits the watermark, we will prefetch starting
// at a "distance" away from watermark.
enum { fall_in_path = 1, pf_path = 2 };
Node *pf_region = new (C, 3) RegionNode(3);
Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY,
@ -1570,6 +1570,45 @@ Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false,
needgc_false = pf_region;
contended_phi_rawmem = pf_phi_rawmem;
i_o = pf_phi_abio;
} else if( UseTLAB && AllocatePrefetchStyle == 3 ) {
// Insert a prefetch for each allocation only on the fast-path
Node *pf_region = new (C, 3) RegionNode(3);
Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY,
TypeRawPtr::BOTTOM );
// Generate several prefetch instructions only for arrays.
uint lines = (length != NULL) ? AllocatePrefetchLines : 1;
uint step_size = AllocatePrefetchStepSize;
uint distance = AllocatePrefetchDistance;
// Next cache address.
Node *cache_adr = new (C, 4) AddPNode(old_eden_top, old_eden_top,
_igvn.MakeConX(distance));
transform_later(cache_adr);
cache_adr = new (C, 2) CastP2XNode(needgc_false, cache_adr);
transform_later(cache_adr);
Node* mask = _igvn.MakeConX(~(intptr_t)(step_size-1));
cache_adr = new (C, 3) AndXNode(cache_adr, mask);
transform_later(cache_adr);
cache_adr = new (C, 2) CastX2PNode(cache_adr);
transform_later(cache_adr);
// Prefetch
Node *prefetch = new (C, 3) PrefetchWriteNode( contended_phi_rawmem, cache_adr );
prefetch->set_req(0, needgc_false);
transform_later(prefetch);
contended_phi_rawmem = prefetch;
Node *prefetch_adr;
distance = step_size;
for ( uint i = 1; i < lines; i++ ) {
prefetch_adr = new (C, 4) AddPNode( cache_adr, cache_adr,
_igvn.MakeConX(distance) );
transform_later(prefetch_adr);
prefetch = new (C, 3) PrefetchWriteNode( contended_phi_rawmem, prefetch_adr );
transform_later(prefetch);
distance += step_size;
contended_phi_rawmem = prefetch;
}
} else if( AllocatePrefetchStyle > 0 ) {
// Insert a prefetch for each allocation only on the fast-path
Node *prefetch_adr;