GCC internals – Instruction Patterns

I am new to gcc compiler backend. I am currently studying how to the .md file to have a understanding.

The thing that I don’t understand is:

I understand the standard pattern like movsi and etc, but I can see some pattern like movsi_internal, movsi_internal_v850e and etc, my question is where in the spec can I find them ? and where are they define ?

Source: gcc

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