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7079329: Adjust allocation prefetching for T4

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On T4 2 BIS instructions should be issued to prefetch 64 bytes

Reviewed-by: iveresov, phh, twisti
This commit is contained in:
Vladimir Kozlov 2011-08-16 16:59:46 -07:00
parent 080f790edc
commit 90651b2666
18 changed files with 299 additions and 129 deletions
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19
hotspot/src/share/vm/opto/macro.cpp
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@ -1590,7 +1590,7 @@ Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false,
prefetch_adr = new (C, 4) AddPNode( old_pf_wm, new_pf_wmt,
_igvn.MakeConX(distance) );
transform_later(prefetch_adr);
prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr );
prefetch = new (C, 3) PrefetchAllocationNode( i_o, prefetch_adr );
transform_later(prefetch);
distance += step_size;
i_o = prefetch;
@ -1611,13 +1611,14 @@ Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false,
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
// Insert a prefetch for each allocation.
// This code is used for Sparc with BIS.
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;
// Generate several prefetch instructions.
uint lines = (length != NULL) ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
uint step_size = AllocatePrefetchStepSize;
uint distance = AllocatePrefetchDistance;
@ -1634,7 +1635,7 @@ Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false,
transform_later(cache_adr);
// Prefetch
Node *prefetch = new (C, 3) PrefetchWriteNode( contended_phi_rawmem, cache_adr );
Node *prefetch = new (C, 3) PrefetchAllocationNode( contended_phi_rawmem, cache_adr );
prefetch->set_req(0, needgc_false);
transform_later(prefetch);
contended_phi_rawmem = prefetch;
@ -1644,7 +1645,7 @@ Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false,
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 );
prefetch = new (C, 3) PrefetchAllocationNode( contended_phi_rawmem, prefetch_adr );
transform_later(prefetch);
distance += step_size;
contended_phi_rawmem = prefetch;
@ -1653,15 +1654,15 @@ Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false,
// Insert a prefetch for each allocation only on the fast-path
Node *prefetch_adr;
Node *prefetch;
// Generate several prefetch instructions only for arrays.
uint lines = (length != NULL) ? AllocatePrefetchLines : 1;
// Generate several prefetch instructions.
uint lines = (length != NULL) ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
uint step_size = AllocatePrefetchStepSize;
uint distance = AllocatePrefetchDistance;
for ( uint i = 0; i < lines; i++ ) {
prefetch_adr = new (C, 4) AddPNode( old_eden_top, new_eden_top,
_igvn.MakeConX(distance) );
transform_later(prefetch_adr);
prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr );
prefetch = new (C, 3) PrefetchAllocationNode( i_o, prefetch_adr );
// Do not let it float too high, since if eden_top == eden_end,
// both might be null.
if( i == 0 ) { // Set control for first prefetch, next follows it