hotspot/src/share/vm/opto/lcm.cpp

rev 7077 : 8066763: fatal error "assert(false) failed: unexpected yanked node" in postaloc.cpp:139
Summary: Check for dead input nodes after replacing compare node with implicit null check.
Reviewed-by: kvn

*** 435,446 ****
    map_node_to_block(nul_chk, block);
    // Redirect users of old_test to nul_chk
    for (DUIterator_Last i2min, i2 = old_tst->last_outs(i2min); i2 >= i2min; --i2)
      old_tst->last_out(i2)->set_req(0, nul_chk);
    // Clean-up any dead code
!   for (uint i3 = 0; i3 < old_tst->req(); i3++)
      old_tst->set_req(i3, NULL);
  
    latency_from_uses(nul_chk);
    latency_from_uses(best);
  }
  
--- 435,453 ----
    map_node_to_block(nul_chk, block);
    // Redirect users of old_test to nul_chk
    for (DUIterator_Last i2min, i2 = old_tst->last_outs(i2min); i2 >= i2min; --i2)
      old_tst->last_out(i2)->set_req(0, nul_chk);
    // Clean-up any dead code
!   for (uint i3 = 0; i3 < old_tst->req(); i3++) {
!     Node* in = old_tst->in(i3);
      old_tst->set_req(i3, NULL);
+     if (in->outcnt() == 0) {
+       // Remove dead input node
+       in->disconnect_inputs(NULL, C);
+       block->find_remove(in);
+     }
+   }
  
    latency_from_uses(nul_chk);
    latency_from_uses(best);
  }