At Lockheed Martin I worked on a SIMD processor designed before VHDL and Verilog existed. The reference design was written in a lisp-like language. I don't know if the language had a name or if it was ever publicized in any way.
https://www.cs.indiana.edu/pub/techreports/TR544.pdf
May have been that one. If not, yall might still find it interesting.