--- old/src/share/vm/opto/chaitin.hpp 2011-09-06 17:51:43.182377354 +0200 +++ new/src/share/vm/opto/chaitin.hpp 2011-09-06 17:51:43.002382155 +0200 @@ -482,6 +482,7 @@ } int yank_if_dead( Node *old, Block *current_block, Node_List *value, Node_List *regnd ); + int yank( Node *old, Block *current_block, Node_List *value, Node_List *regnd ); int elide_copy( Node *n, int k, Block *current_block, Node_List &value, Node_List ®nd, bool can_change_regs ); int use_prior_register( Node *copy, uint idx, Node *def, Block *current_block, Node_List &value, Node_List ®nd ); bool may_be_copy_of_callee( Node *def ) const; --- old/src/share/vm/opto/postaloc.cpp 2011-09-06 17:51:44.484038615 +0200 +++ new/src/share/vm/opto/postaloc.cpp 2011-09-06 17:51:44.310209146 +0200 @@ -72,7 +72,22 @@ return i == limit; } - +//------------------------------yank----------------------------------- +// Helper function for yank_if_dead +int PhaseChaitin::yank( Node *old, Block *current_block, Node_List *value, Node_List *regnd ) { + int blk_adjust=0; + Block *oldb = _cfg._bbs[old->_idx]; + oldb->find_remove(old); + // Count 1 if deleting an instruction from the current block + if( oldb == current_block ) blk_adjust++; + _cfg._bbs.map(old->_idx,NULL); + OptoReg::Name old_reg = lrgs(n2lidx(old)).reg(); + if( regnd && (*regnd)[old_reg]==old ) { // Instruction is currently available? + value->map(old_reg,NULL); // Yank from value/regnd maps + regnd->map(old_reg,NULL); // This register's value is now unknown + } + return blk_adjust; +} //------------------------------yank_if_dead----------------------------------- // Removed an edge from 'old'. Yank if dead. Return adjustment counts to @@ -80,18 +95,20 @@ int PhaseChaitin::yank_if_dead( Node *old, Block *current_block, Node_List *value, Node_List *regnd ) { int blk_adjust=0; while (old->outcnt() == 0 && old != C->top()) { - Block *oldb = _cfg._bbs[old->_idx]; - oldb->find_remove(old); - // Count 1 if deleting an instruction from the current block - if( oldb == current_block ) blk_adjust++; - _cfg._bbs.map(old->_idx,NULL); - OptoReg::Name old_reg = lrgs(n2lidx(old)).reg(); - if( regnd && (*regnd)[old_reg]==old ) { // Instruction is currently available? - value->map(old_reg,NULL); // Yank from value/regnd maps - regnd->map(old_reg,NULL); // This register's value is now unknown + blk_adjust += yank(old, current_block, value, regnd); + + Node *tmp = NULL; + for (uint i = 1; i < old->req(); i++) { + if (old->in(i)->is_MachTemp()) { + Node* machtmp = old->in(i); + assert(machtmp->outcnt() == 1, "expected for a MachTemp"); + blk_adjust += yank(machtmp, current_block, value, regnd); + machtmp->disconnect_inputs(NULL); + } else { + assert(tmp == NULL, "can't handle more non MachTemp inputs"); + tmp = old->in(i); + } } - assert(old->req() <= 2, "can't handle more inputs"); - Node *tmp = old->req() > 1 ? old->in(1) : NULL; old->disconnect_inputs(NULL); if( !tmp ) break; old = tmp;