when designing SOC's you write your IP in verilog or vhdl, however high performance IP such as a CPU are designed specifically for certain chip process, (Intel'

when designing SOC's you write your IP in verilog or vhdl, however high performance IP such as a CPU are designed specifically for certain chip process, (Intel's 10nm or TSMC's 16nm) and you don't get it in source code (verilog) instead you buy the physical IP (sometimes call hard IP) which is literally bolted to the die next to your design and wired with your design. So, if I'm designing mobile SOC and need 2Ghz CPU in my SOC design, I check with Intel or TSMC to see if they have HardIP of that CPU that I need.