Mercurial > hg > truffle

comparison src/share/vm/opto/macro.cpp @ 3282:149bb459be66

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
7029167: add support for conditional card marks Reviewed-by: iveresov, kvn
author never
date Wed, 27 Apr 2011 15:40:36 -0700
parents b1a2afa37ec4
children bad7ecd0b6ed
comparison
equal deleted inserted replaced
3281:273b56978029 3282:149bb459be66
219 if (!UseG1GC) { 219 if (!UseG1GC) {
220 // vanilla/CMS post barrier 220 // vanilla/CMS post barrier
221 Node *shift = p2x->unique_out(); 221 Node *shift = p2x->unique_out();
222 Node *addp = shift->unique_out(); 222 Node *addp = shift->unique_out();
223 for (DUIterator_Last jmin, j = addp->last_outs(jmin); j >= jmin; --j) { 223 for (DUIterator_Last jmin, j = addp->last_outs(jmin); j >= jmin; --j) {
224 Node *st = addp->last_out(j); 224 Node *mem = addp->last_out(j);
225 assert(st->is_Store(), "store required"); 225 if (UseCondCardMark && mem->is_Load()) {
226 _igvn.replace_node(st, st->in(MemNode::Memory)); 226 assert(mem->Opcode() == Op_LoadB, "unexpected code shape");
227 // The load is checking if the card has been written so
228 // replace it with zero to fold the test.
229 _igvn.replace_node(mem, intcon(0));
230 continue;
231 }
232 assert(mem->is_Store(), "store required");
233 _igvn.replace_node(mem, mem->in(MemNode::Memory));
227 } 234 }
228 } else { 235 } else {
229 // G1 pre/post barriers 236 // G1 pre/post barriers
230 assert(p2x->outcnt() == 2, "expects 2 users: Xor and URShift nodes"); 237 assert(p2x->outcnt() == 2, "expects 2 users: Xor and URShift nodes");
231 // It could be only one user, URShift node, in Object.clone() instrinsic 238 // It could be only one user, URShift node, in Object.clone() instrinsic