markdown/gh_discussions/Query/3037.md

confusion over where worst slacks are stored and populated

Tool: Gate Resizer

Subcategory: Code understanding

Conversation

cshi15

Hello, I'm an undergrad who has been trying to add some new functionality and thus trying to learn how the codebase works.

Right now, I am working in Resizer and trying to write a function that will print out the top failing (negative slack) paths. I was studying the code for worst slacks by studying the worstSlack functions in Search.cc and WorstSlack.cc, and also the findResizeSlacks() function in Resizer.cc. Looking at the findResizeSlacks1() function in Resizer.cc, it appears to populate the worst_slack_nets_ field. However, when I try to access worst_slack_nets_ in my function, it appears to be empty.

Is there something that I need to call before this to populate the field? Should I even be trying to access worst_slack_nets_ at all?

rovinski

@openroadie @maliberty any ideas here?

@cshi15 maybe take a quick look at #3045 to see if there was anything useful there. Also maybe if you can commit what you have to a fork then it will make it easier to understand what you have tried so far.

maliberty

I'm guessing you need to call Resizer::resizePreamble() first.

maliberty

Can you put the code on a branch somewhere?