Test : compstudio.jar
Mode : -Xcomp
Platform : Solx86

Steps to reproduce
1) cd /net/sqesvr.eng/export/vsn/GammaBase/Bugs/{Bugid}
2) sh doit

{OR}

run the following command-line

/net/sqesvr.eng/export/vsn/VM/merlin/weekahead/jdk/latest/solx86/bin/java_g -server -Xcomp -XX:-ShowMessageBoxOnError -Xverify:all -XX:+CompileTheWorld -XX:CompileTheWorldStartAt=3217 -XX:CompileTheWorldStopAt=3407 -Xbootclasspath/p:/net/sqesvr.eng/export/vsn/VM/testbase/CompileTheWorld/jars/a-d/compstudio.jar

Output:
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b60)
Java HotSpot(TM) Server VM (build 20010411221312.azeem.merlin_beta-debug, compiled mode)
VM option '-ShowMessageBoxOnError'
VM option '+CompileTheWorld'
VM option 'CompileTheWorldStartAt=3217'
VM option 'CompileTheWorldStopAt=3407'
CompileTheWorld : Compiling all classes in /net/sqesvr.eng/export/vsn/VM/testbase/testbase_vm/src/jit/compiletheworld/jars/a-d/compstudio.jar

CompileTheWorld (3406) : ser/nexus/TargetElement
CompileTheWorld (3407) : ser/nexus/Unit
#
# HotSpot Virtual Machine Error, assertion failure
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# assert(i < _cnt, "oob")
#
# Error ID: /net/jano.eng/export/disk05/hotspot/imgr/ws/20010411221312.azeem.merlin_beta/src/share/vm/opto/node.hpp, 270
#
# Problematic Thread: prio=5 tid=0x817a4a8 nid=0xc runnable
#
Dumping core....
Abort - core dumped

******************************************************************
The fix is to call set_prec from Node::replace_by as appropriate.

------- phaseX.cpp -------
--- /tmp/sd4168 Tue Apr 17 20:35:20 2001
+++ phaseX.cpp Tue Apr 17 20:34:43 2001
@@ -1567,7 +1567,10 @@ void Node::replace_by(Node *new_node) {
     uint uses_found = 0;
     for (uint j = 0; j < use->len(); j++) {
       if (use->in(j) == this) {
- use->set_req(j, new_node);
+ if (j < use->req())
+ use->set_req(j, new_node);
+ else
+ use->set_prec(j, new_node);
  uses_found++;
       }
     }