comparison mercurial/revlogutils/deltas.py @ 40957:f960c51eebf3

delta: filter nullrev out first

When picking a potential candidate, we filter them on various criteria. The
"different from nullrev" criteria is very fast to compute and we should
process it first.

40956:74ee5ff1e81c

                   and not (rev == nullrev
                            or rev in tested
                            or deltalength(rev))):
                tested.add(rev)
                rev = deltaparent(rev)
            # filter out revision we tested already
            if rev in tested:
                continue
            tested.add(rev)
            # filter out delta base that will never produce good delta
            if deltas_limit < revlog.length(rev):
                continue
            # no need to try a delta against nullrev, this will be done as a
            # last resort.
            if rev == nullrev:
                continue
            # no delta for rawtext-changing revs (see "candelta" for why)
            if revlog.flags(rev) & REVIDX_RAWTEXT_CHANGING_FLAGS:
                continue
            group.append(rev)

40957:f960c51eebf3

                   and not (rev == nullrev
                            or rev in tested
                            or deltalength(rev))):
                tested.add(rev)
                rev = deltaparent(rev)
            # no need to try a delta against nullrev, this will be done as a
            # last resort.
            if rev == nullrev:
                continue
            # filter out revision we tested already
            if rev in tested:
                continue
            tested.add(rev)
            # filter out delta base that will never produce good delta
            if deltas_limit < revlog.length(rev):
                continue
            # no delta for rawtext-changing revs (see "candelta" for why)
            if revlog.flags(rev) & REVIDX_RAWTEXT_CHANGING_FLAGS:
                continue
            group.append(rev)