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dbForEach dbForAll and db*Next* difference

iclabwhoami

Hi ,

Do anyone know what's the difference between  dbForEach* and dbForAll *?  why does it need to use db*Next*

in iteration loop?

Parents

  • I also found there are dbIterAllRoutes ,dbIterRoutes ,dbEndIterRoutes,dbEndIterAllRoutes,so I think dbNext* are used in this iteration method, such as the following code :

     

    set iter [dbIterRoutes $net]
    while {[set route [dbRouteNext $iter]] != "0x0"} {
    if [dbIsRouteWire $route] {
    set wire_info [dbInfoWire $route]
    } elseif [dbIsRouteVia $route] {
    set via_info [dbInfoVia $route]
    } else {
    puts "something’s wrong\n"
    }
    ...
    if (want to break out of the iterator loop)
    dbEndIterRoutes $iter
    ...
    }

     But I'm wondering why  cadence add this new iteration method,  and what's difference between dbIterRoutes and dbIterAllRoutes? Thanks!

     

Reply

  • I also found there are dbIterAllRoutes ,dbIterRoutes ,dbEndIterRoutes,dbEndIterAllRoutes,so I think dbNext* are used in this iteration method, such as the following code :

     

    set iter [dbIterRoutes $net]
    while {[set route [dbRouteNext $iter]] != "0x0"} {
    if [dbIsRouteWire $route] {
    set wire_info [dbInfoWire $route]
    } elseif [dbIsRouteVia $route] {
    set via_info [dbInfoVia $route]
    } else {
    puts "something’s wrong\n"
    }
    ...
    if (want to break out of the iterator loop)
    dbEndIterRoutes $iter
    ...
    }

     But I'm wondering why  cadence add this new iteration method,  and what's difference between dbIterRoutes and dbIterAllRoutes? Thanks!

     

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