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rust: less set lookups in AncestorsIterator...

rust: less set lookups in AncestorsIterator This uses the boolean return of `HashSet::insert()` to factor pairs of contains()/insert() into a single insert() On the mozilla-central repository (450k changesets), I get about a bit more than 10% better medians in perfancestors (taking the mean of three runs) Best run for parent changeset: ! wall 0.106474 comb 0.110000 user 0.110000 sys 0.000000 (median of 93) Best run for this changeset: ! wall 0.093191 comb 0.090000 user 0.090000 sys 0.000000 (median of 100) Differential Revision: https://phab.mercurial-scm.org/D5942

Olle Lundberg - - Load All Authors

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             rebase.sh
        
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      #!/usr/bin/env bash

      hg init rebase

      cd rebase

      #  @  7: 'H'

      #  |

      #  | o  6: 'G'

      #  |/|

      #  o |  5: 'F'

      #  | |

      #  | o  4: 'E'

      #  |/

      #  | o  3: 'D'

      #  | |

      #  | o  2: 'C'

      #  | |

      #  | o  1: 'B'

      #  |/

      #  o  0: 'A'

      echo A > A

      hg ci -Am A

      echo B > B

      hg ci -Am B

      echo C > C

      hg ci -Am C

      echo D > D

      hg ci -Am D

      hg up -q -C 0

      echo E > E

      hg ci -Am E

      hg up -q -C 0

      echo F > F

      hg ci -Am F

      hg merge -r 4

      hg ci -m G

      hg up -q -C 5

      echo H > H

      hg ci -Am H

      hg bundle -a ../rebase.hg

      cd ..

      rm -Rf rebase

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				#!/usr/bin/env bash
				hg init rebase
				cd rebase

				# @ 7: 'H'
				# \|
				# \| o 6: 'G'
				# \|/\|
				# o \| 5: 'F'
				# \| \|
				# \| o 4: 'E'
				# \|/
				# \| o 3: 'D'
				# \| \|
				# \| o 2: 'C'
				# \| \|
				# \| o 1: 'B'
				# \|/
				# o 0: 'A'

				echo A > A
				hg ci -Am A
				echo B > B
				hg ci -Am B
				echo C > C
				hg ci -Am C
				echo D > D
				hg ci -Am D
				hg up -q -C 0
				echo E > E
				hg ci -Am E
				hg up -q -C 0
				echo F > F
				hg ci -Am F
				hg merge -r 4
				hg ci -m G
				hg up -q -C 5
				echo H > H
				hg ci -Am H

				hg bundle -a ../rebase.hg

				cd ..
				rm -Rf rebase