how to add new instructions in gcc and test

hi to all,
         i like to upgrade the gcc with some more extra instructions for the ARM processor. but if i write the new instruction then how can i check the newly added instructions are working correctly or not. and how can i verify the output is correct!!!

whether arm-gdb is a good solution. i have downloaded and installed the sid whether it will be useful for these kind of need...

thanks for reply
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