bootstrap/9382: AIX 5.2 ../../gcc-20030120/gcc/libgcc2.c:1161: internal compiler error: in extract_insn, at recog.c:2175

[John Ruttenberg]

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9382

I have some more information about this.  It seems to happen or not depending
on which compiler I use to bootstrap.  With 3.2.1 (binary from UCLA) and 2.9
(binary form IBM), I encounter the problem.  With 2.95.3 (I bootstrapped), I
do not encounter the problem.

The fact that the problem can be reproduced with two different bootstrap
compilers from such different releases leads me to suspect that perhaps there
is some uninitialized variable involved.  Or some other cause of undefined
behavior.

I don't know that much aboug gcc internals, but perhaps I can narrow down a
little further somehow.  But it will be time consuming and it would be good to
know if anyone knows anything about this before I expend any energy on it.