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usage of properties fields in opt_pass


Hi,

I am interested in writing a new gimple pass using gcc plugins. Since
Im new to gcc development, can someone please tell me the usage of the
three property bitmaps present in the opt_pass struct ?
(properties_required, properties_provided, properties_destroyed). i.e
How will I know what should be these properties if I want to write a
new Gimple optimization pass ?

Thanks & Regards,
Aravinda


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