[restricted_ptr]

Xtensa architecture is flexible and extendable by the user. Ability to define new instructions, hw features and VLIW configurations are some of the key features. You can find more details on the internet https://en.m.wikipedia.org/wiki/Tensilica

[jki275]

I don't think that applies to the ESP32 family of devices. I've never heard of DSP hardware onboard them.

I think the comment you're referring to is talking about the architecture in general, but not the silicon we're discussing here.

[restricted_ptr]

ESP32 ee.* operations in assembly look pretty much like aliases for a VLIW bundles, on the same cycle issuing loads used in the next op while also doing multiplication on other operands. This is not a minimal Xtensa. They might not have the Tensilica toolchain for redistribution to use these features freely but apparently they exposed these extensions in their assembler in some form.