Control Data had a lab in Mississauga On, (outside of Toronto) in the 70s and 80s where some of the CDC Cyber 180s were designed and built.
A company called HCR Corp in Toronto did a considerable amount of work for CDC re-targeting pcc and UNIX System V for the 180s and ETA10.
I was fortunate enough to work for both companies. I didn't work on the pcc port to the Cyber 180, but some of the UNIX port. I thought the Cyber 180 architecture was way ahead of it's time. Virtual memory, 64-bit ints, shared libraries. Some of the 180s were also dual-state, NOS/VE 64-bit OS and apps 50% of the time, a CPU microcode switch, to NOS and the 60-bit platform for 50% of the time, to support NOS to NOS/VE migration. Pcc re-targeting was challenging in a number of ways, addresses were 48 bits, with a ring and segment number, which resulted in a NULL pointer actually not being 0.
HCR also did work on the ETA10 UNIX port, I didn't participate on that project, but HCR also re-targeted pcc for the Intel iWarp CPU, which I worked on. HCR had a portable global code optimizer and peephole optimizer for pcc, so much of the work involved splitting pcc, for the global optimizer, to operate between front and back ends, and integrating the peephole optimizer, re-targeting the code generator, and tuning.
A lot of very smart people who were great to work with at CDC and HCR, certainly a great way to start my career.