977     if not revs:

   977     if not revs:

   978         return []

   978         return []

   979     wanted = set()

   979     wanted = set()

   980     slowpath = match.anypats() or (match.files() and opts.get('removed'))

   980     slowpath = match.anypats() or (match.files() and opts.get('removed'))

   981     fncache = {}

   981     fncache = {}

   983 

   983 

   984     # First step is to fill wanted, the set of revisions that we want to yield.

   984     # First step is to fill wanted, the set of revisions that we want to yield.

   985     # When it does not induce extra cost, we also fill fncache for revisions in

   985     # When it does not induce extra cost, we also fill fncache for revisions in

   986     # wanted: a cache of filenames that were changed (ctx.files()) and that

   986     # wanted: a cache of filenames that were changed (ctx.files()) and that

   987     # match the file filtering conditions.

   987     # match the file filtering conditions.