[tree-ssa] mainline->branch merge status

[Diego Novillo <dnovillo at redhat dot com>]

This has been one of the most horrendous merges I've had to go through. 
Thanks to Andrew Haley for helping me with merging the java bits.  The
merge is still not fully functional, though.  There are several new
regressions (attached).

Most of them seem related to branch prediction.  Jan, maybe this is due
to the drift between mainline and the branch in the CFG bits?

Andrew tells me that he will deal with the new java failures after the
merge is committed.

A heads-up for those of us following SPEC results.  The new merge brings
in the removal of assignments to non-lvalues.  This produces a compile
error in 176.gcc:

reorg.c: In function `find_end_label':
reorg.c:831: error: invalid lvalue in increment
reorg.c: In function `delete_from_delay_slot':
reorg.c:1033: error: invalid lvalue in increment
reorg.c: In function `make_return_insns':
reorg.c:4157: error: invalid lvalue in increment
reorg.c: In function `dbr_schedule':
reorg.c:4237: error: invalid lvalue in increment
specmake: *** [reorg.o] Error 1

This comes from the old obstack.h file.  I fixed the file, but cc1
miscompares at runtime.  Maybe my fix is wrong, or maybe we've inherited
a bug from mainline.  I still don't know.

The merge bootstraps on x86 and x86-64, but I don't want to commit it
yet, as there are too many regressions for my taste.  I'd appreciate it
if folks can take a look and help me fix them.  Jan, maybe you could
merge the mainline and branch cgraph stuff?

The merge is at

http://people.redhat.com/dnovillo/pub/merge-20040126.tar.bz2


Thanks.  Diego.

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