Intel Corp (INTC)

[chipguy]

The challenges and compromises needed to manufacture both a high performance Xeon and an FPGA on a single chip might not be worth it though.

Maybe, maybe not. Intel MPUs already contain probably hundreds or even
thousands of one time programmable elements (fuses or anti-fuses) for SKU
configuration and to facilitate/de-risk engineering verification. If these aren't
yet competitive in size with those used for FPGAs then Intel process people
could probably close the gap pretty fast. Beyond that the only major process
challenge would be I/O voltage compatibility. Even there some of Intel's SoC
process variants already support moderate voltage I/O signalling.