Is there a list of "special" "ops" like $mul? and other questions.

[gussmith23]

I put both "special" and "ops" in quotes because I'm unsure whether $mul is considered special, and I'm also unsure as to whether they can be called "ops" 😆

I have a number of related questions:

1. I'm wondering if there's a list of things like $mul somewhere in Yosys.
2. Do you have ops like $mac to represent fused multiply-addition, or something like multiply-plus-logic i.e. mul-and? I'm curious about the range of operations you support.
3. For things like the Xilinx DSP48E2, how would I go about supporting multiply followed by logic? Even more interestingly, how could I go about using the DSP's pattern detector?

Thank you all!