optimization/6049: Optimization and Synchronization

["Roland Hautz"@sources.redhat.com]

>Number:         6049
>Category:       optimization
>Synopsis:       Optimization and Synchronization
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 23 16:46:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     
>Release:        3.2 20020319 (experimental)
>Organization:
>Environment:
System: Linux isabella 2.4.10-4GB #1 Tue Sep 25 12:33:54 GMT 2001 i586 unknown
Architecture: i586

	
host: i586-pc-linux-gnu
build: i586-pc-linux-gnu
target: i586-pc-linux-gnu
configured with:  /home/roland/gcc/configure --enable-threads=posix --enable-languages=c,c++,java
>Description:
legal code rejected by optimization stage
>How-To-Repeat:
# gcj -c Test1.java
# gcj -O -c Test1.java
Test1.java: In class `Test1':
Test1.java: In method `Test1.test()':
Test1.java:10: Wrong amount of branch edges after unconditional jump 1
Test1.java:10: verify_flow_info failed

class Test1 {
  Object table;
  void test() {
        Object tab = table;
        if (tab == null) {
            synchronized(this) {
                tab = table;
            }
        }
  }  
}

>Fix:
	
>Release-Note:
>Audit-Trail:
>Unformatted: