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comparison src/share/vm/opto/reg_split.cpp @ 605:98cb887364d3

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6810672: Comment typos Summary: I have collected some typos I have found while looking at the code. Reviewed-by: kvn, never
author twisti
date Fri, 27 Feb 2009 13:27:09 -0800
parents 91263420e1c6
children 7bb995fbd3c0
comparison
equal deleted inserted replaced
604:ec59443af135 605:98cb887364d3
24 24
25 #include "incls/_precompiled.incl" 25 #include "incls/_precompiled.incl"
26 #include "incls/_reg_split.cpp.incl" 26 #include "incls/_reg_split.cpp.incl"
27 27
28 //------------------------------Split-------------------------------------- 28 //------------------------------Split--------------------------------------
29 // Walk the graph in RPO and for each lrg which spills, propogate reaching 29 // Walk the graph in RPO and for each lrg which spills, propagate reaching
30 // definitions. During propogation, split the live range around regions of 30 // definitions. During propagation, split the live range around regions of
31 // High Register Pressure (HRP). If a Def is in a region of Low Register 31 // High Register Pressure (HRP). If a Def is in a region of Low Register
32 // Pressure (LRP), it will not get spilled until we encounter a region of 32 // Pressure (LRP), it will not get spilled until we encounter a region of
33 // HRP between it and one of its uses. We will spill at the transition 33 // HRP between it and one of its uses. We will spill at the transition
34 // point between LRP and HRP. Uses in the HRP region will use the spilled 34 // point between LRP and HRP. Uses in the HRP region will use the spilled
35 // Def. The first Use outside the HRP region will generate a SpillCopy to 35 // Def. The first Use outside the HRP region will generate a SpillCopy to
86 } 86 }
87 return new (C) MachSpillCopyNode( def, *w_i_mask, *w_o_mask ); 87 return new (C) MachSpillCopyNode( def, *w_i_mask, *w_o_mask );
88 } 88 }
89 89
90 //------------------------------insert_proj------------------------------------ 90 //------------------------------insert_proj------------------------------------
91 // Insert the spill at chosen location. Skip over any interveneing Proj's or 91 // Insert the spill at chosen location. Skip over any intervening Proj's or
92 // Phis. Skip over a CatchNode and projs, inserting in the fall-through block 92 // Phis. Skip over a CatchNode and projs, inserting in the fall-through block
93 // instead. Update high-pressure indices. Create a new live range. 93 // instead. Update high-pressure indices. Create a new live range.
94 void PhaseChaitin::insert_proj( Block *b, uint i, Node *spill, uint maxlrg ) { 94 void PhaseChaitin::insert_proj( Block *b, uint i, Node *spill, uint maxlrg ) {
95 // Skip intervening ProjNodes. Do not insert between a ProjNode and 95 // Skip intervening ProjNodes. Do not insert between a ProjNode and
96 // its definer. 96 // its definer.
123 // the node->live range mapping. 123 // the node->live range mapping.
124 new_lrg(spill,maxlrg); 124 new_lrg(spill,maxlrg);
125 } 125 }
126 126
127 //------------------------------split_DEF-------------------------------------- 127 //------------------------------split_DEF--------------------------------------
128 // There are four catagories of Split; UP/DOWN x DEF/USE 128 // There are four categories of Split; UP/DOWN x DEF/USE
129 // Only three of these really occur as DOWN/USE will always color 129 // Only three of these really occur as DOWN/USE will always color
130 // Any Split with a DEF cannot CISC-Spill now. Thus we need 130 // Any Split with a DEF cannot CISC-Spill now. Thus we need
131 // two helper routines, one for Split DEFS (insert after instruction), 131 // two helper routines, one for Split DEFS (insert after instruction),
132 // one for Split USES (insert before instruction). DEF insertion 132 // one for Split USES (insert before instruction). DEF insertion
133 // happens inside Split, where the Leaveblock array is updated. 133 // happens inside Split, where the Leaveblock array is updated.
724 !b->_nodes[b->_fhrp_index]->is_Proj(), "" ); 724 !b->_nodes[b->_fhrp_index]->is_Proj(), "" );
725 725
726 // ********** Handle Crossing HRP Boundry ********** 726 // ********** Handle Crossing HRP Boundry **********
727 if( (insidx == b->_ihrp_index) || (insidx == b->_fhrp_index) ) { 727 if( (insidx == b->_ihrp_index) || (insidx == b->_fhrp_index) ) {
728 for( slidx = 0; slidx < spill_cnt; slidx++ ) { 728 for( slidx = 0; slidx < spill_cnt; slidx++ ) {
729 // Check for need to split at HRP boundry - split if UP 729 // Check for need to split at HRP boundary - split if UP
730 n1 = Reachblock[slidx]; 730 n1 = Reachblock[slidx];
731 // bail out if no reaching DEF 731 // bail out if no reaching DEF
732 if( n1 == NULL ) continue; 732 if( n1 == NULL ) continue;
733 // bail out if live range is 'isolated' around inner loop 733 // bail out if live range is 'isolated' around inner loop
734 uint lidx = lidxs.at(slidx); 734 uint lidx = lidxs.at(slidx);