# HG changeset patch
# User kvn
# Date 1248638381 25200
# Node ID dd0a4e1e219be34f30b422eb1520ddcc1da13c27
# Parent  a94af87c3357f7764b0bf46f2c9bb2004cf3b5c0
6851386: assert(b->find_node(def) < j,"uses must follow definitions")
Summary: Add additional check for a tight loop.
Reviewed-by: never

diff -r a94af87c3357 -r dd0a4e1e219b src/share/vm/opto/block.cpp
--- a/src/share/vm/opto/block.cpp	Fri Jul 24 12:40:40 2009 -0700
+++ b/src/share/vm/opto/block.cpp	Sun Jul 26 12:59:41 2009 -0700
@@ -910,7 +910,16 @@
               !(b->head()->is_Loop() && n->is_Phi()) &&
               // See (+++) comment in reg_split.cpp
               !(n->jvms() != NULL && n->jvms()->is_monitor_use(k)) ) {
-            assert( b->find_node(def) < j, "uses must follow definitions" );
+            bool is_loop = false;
+            if (n->is_Phi()) {
+              for( uint l = 1; l < def->req(); l++ ) {
+                if (n == def->in(l)) {
+                  is_loop = true;
+                  break; // Some kind of loop
+                }
+              }
+            }
+            assert( is_loop || b->find_node(def) < j, "uses must follow definitions" );
           }
           if( def->is_SafePointScalarObject() ) {
             assert(_bbs[def->_idx] == b, "SafePointScalarObject Node should be at the same block as its SafePoint node");