[FIRRTL] Support layers in MergeConnections #7912
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Modify the `MergeConnections` pass to walk into regions and blocks. Because the algorithm used in this pass wants to insert operations _after_ the operation that is currently being processed _and then_ visit them, this cannot use a normal `Operation::walk` (since this will pre-increment and not visit these operations). Keep this existing algorithm, but use an iterator worklist to make this behave like a walk. This is done as part of moving `LowerLayers` to the end of the FIRRTL pipeline so that inline layer support (which requires producing `sv.ifdef` operations which we would like to hide from the rest of the FIRRTL pipeline) can be turned on. Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>
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Modify the
MergeConnectionspass to walk into regions and blocks. Because the algorithm used in this pass wants to insert operations after the operation that is currently being processed and then visit them, this cannot use a normalOperation::walk(since this will pre-increment and not visit these operations). Keep this existing algorithm, but use an iterator worklist to make this behave like a walk.This is done as part of moving
LowerLayersto the end of the FIRRTL pipeline so that inline layer support (which requires producingsv.ifdefoperations which we would like to hide from the rest of the FIRRTL pipeline) can be turned on.