14 Jul
2018
14 Jul
'18
10:51 a.m.
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