src/share/vm/opto/ifg.cpp
Index
Unified diffs
Context diffs
Sdiffs
Wdiffs
Patch
New
Old
Previous File
Next File
8065618_8u Cdiff src/share/vm/opto/ifg.cpp
src/share/vm/opto/ifg.cpp
Print this page
*** 539,548 ****
--- 539,564 ----
if( !liveout.member(r) && n->Opcode() != Op_SafePoint ) {
Node *def = n->in(0);
if( !n->is_Proj() ||
// Could also be a flags-projection of a dead ADD or such.
(_lrg_map.live_range_id(def) && !liveout.member(_lrg_map.live_range_id(def)))) {
+ if (n->is_MachProj()) {
+ // Don't remove KILL projections if their "defining" nodes have
+ // memory effects (have SCMemProj projection node) -
+ // they are not dead even when their result is not used.
+ // For example, compareAndSwapL (and other CAS) and EncodeISOArray nodes.
+ // The method add_input_to_liveout() keeps such nodes alive (put them on liveout list)
+ // when it sees SCMemProj node in a block. Unfortunately SCMemProj node could be placed
+ // in block in such order that KILL MachProj nodes are processed first.
+ uint cnt = def->outcnt();
+ for (uint i = 0; i < cnt; i++) {
+ Node* proj = def->raw_out(i);
+ if (proj->Opcode() == Op_SCMemProj) {
+ return false;
+ }
+ }
+ }
block->remove_node(j - 1);
if (lrgs(r)._def == n) {
lrgs(r)._def = 0;
}
n->disconnect_inputs(NULL, C);
src/share/vm/opto/ifg.cpp
Index
Unified diffs
Context diffs
Sdiffs
Wdiffs
Patch
New
Old
Previous File
Next File