Specify a single location or a specific region for a custom switch block

[saaramahmoudi]

This PR generalize the custom switch block description to allow the user to specify a exact (x,y) location for the switch block by setting type="XY_SPECIFIED", the exact syntax is explained below:

• You should set the switch block type to XY_SPECIFIED (upper case), the other options are: EVERYWHERE, CORNER, ..
• Once you set the type to XY_SPECIFIED, you can put an exact location by setting a "x" and "y" attribute, for example: x="1" y="2"
• If you want to specify a complete row, you can set "x" to -1, for example: x="-1" y="2"
• if you want to specify a complete column, you can set "y" to -1, for example: x="2" y="-1"
• If you want to specify a part of grid, you can specify a region using regular expression documented here: https://mithro-vtr.readthedocs.io/en/latest/arch/reference.html#tag-%3Cregiontype= (please search for word "region" in layout documentation)

How Has This Been Tested?

The x and y attribute is tested by @petergrossmann21, and the region description is tested by myself.

Types of changes

• Bug fix (change which fixes an issue)
• New feature (change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

I will add a new test and update documentation later today, but I have created the PR to start the review process.

[vaughnbetz]

Thanks @saaramahmoudi . I'll review shortly. Can you also please update the documentation and add it to this PR?

[saaramahmoudi]

Thanks @saaramahmoudi . I'll review shortly. Can you also please update the documentation and add it to this PR?

Yes, I will update both documentation and a new CI test for this PR later today.

[petergrossmann21]

@saaramahmoudi Can you include the tests that verify this feature in the PR?

[vaughnbetz]

Some comments to address (mine partially overlap Soheil's).
Also, it would be good to make the documentation update now, as part of this PR as well. That also might help clarify the precise meaning of repeat and increment (as would comments on the structure data members storing the sb_loc information).

[petergrossmann21]

@saaramahmoudi I don't see any new files related to testing; is there something that still needs to be added?

[saaramahmoudi]

@petergrossmann21 @vaughnbetz I am so sorry, but I have been busy doing a different task at work. I am trying my best to land this PR as soon as possible. It might take two-three weeks.

[vaughnbetz]

@saaramahmoudi : I think this is ready to merge, but I just merged a libcatch2 update that caused a conflict (sorry!). If you fix that conflict I think this is good to go.