Question about Machine Description

[yazdanbakhsh]

Dear all,

I'm working on my a gcc compiler for my own written processor with the help
of SimpleScalar.
I want to remove "srav/slav" (immediate arithmetic shift) from the
instruction set. I explore ss.md file but I didn't see any define_ins for
the mentioned instructions, but they are used in other instruction
definitions.
It is also exist for addi/addui. Where I can find the definitions of these
instructions? I want to force gcc to just use register shift and register
add.

Best Regards,
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