Guide to add new architecture in gcc

[kwkhoo]

I am trying to add a new DSP architecture into the gcc in order to
compile/assemble program in host machine that create executable for the
target DSP. I have been searching around the internet to see if there is any
guide showing how to add new hardware architecture description and ISA to
the gcc for days but in vain. Can anybody direct me to any sites that have
this information please?

Thanks in advance for the help.
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