10 Dec
2018
10 Dec
'18
9:28 p.m.
Hello Paul!
When I read this once upon during the summer I saw that the problems I once
had reported was solved and it was great news. Really thankful that you did
so much work with this!
However I know tried to turn on optimizations and then it fails in a
strange way.
If you have some spare time maybe you could check why it fails on when
11/10 but not when set to 11/40. And it only fails for even powers of two
above 16. It is the if that fails so if I remove that one it works.
The bug report is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88435
/Mattis
Den l?r 14 juli 2018 kl 19:51 skrev Paul Koning via cctalk <
cctalk at classiccmp.org>:
On Jul 14, 2018, at 9:46 AM, David Bridgham via
cctalk <
cctalk at classiccmp.org> wrote:
Hey, glad to hear of some improvement on GCC for the PDP-11. Last
spring I ended up side-tracked on the QSIC project and working more on
FPGA issues than writing PDP-11 code but that's going to change here at
some point. I still want to put a soft PDP-11 into the FPGA as an I/O
controller and will need to be writing code for it.
For the moment, I'm off at my summer job in Alaska but when I get home
this fall, it's back to working away on the QSIC and maybe my PDP-10
project where I'm thinking I may also use a soft PDP-11 as an I/O
processor. Anyway, I'll grab up the new GCC and see if my issues with
the 'volatile' keyword are still there.
I didn't directly address anything like that, but it may well be that
things are better. "Volatile" is a very tricky area. There is detailed
discussion in the GCC manual about when volatile objects are accessed. You
may want to review that. Sometimes the rules are not precisely what you
might expect.
paul