[Bug bootstrap/44970] [4.6 regression] Revision 162270 failed to bootstrap

[bernds at gcc dot gnu dot org]

------- Comment #56 from bernds at gcc dot gnu dot org  2010-08-05 11:31 -------
Created an attachment (id=21400)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21400&action=view)
A patch to aid debugging

This patch should help pinpoint exactly what went wrong.  It adds a dbg-cnt to
the code in question.

If you could experiment with passing -fdbg-cnt=bug:N to the compiler, where N
is an integer value, using a binary search you should arrive relatively quickly
at a value of N where the generated code is OK for N but fails for N + 1. 
Then, could you attach good/bad assembly files and debug dumps?  Just the
.expand, .combine and .ira dumps initially would be helpful if we want to save
disk space here.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44970