Unverified Commit e51a2016 authored by Ali Ijaz Sheikh's avatar Ali Ijaz Sheikh Committed by Anna Henningsen
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deps: backport 6d38f89d from upstream V8

Original commit message:
  [turbofan] Boost performance of Array.prototype.shift by 4x.

  For small arrays, it's way faster to just move the elements instead of
  doing the fairly complex and heavy-weight left-trimming. Crankshaft has
  had this optimization for small arrays already; this CL more or less
  ports this functionality to TurboFan, which yields a 4x speed-up when
  using shift on small arrays (with up to 16 elements).

  This should recover some of the regressions reported in the Node.js issues

    https://github.com/nodejs/node/issues/12657

  and discovered for the syncthrough module using

    https://github.com/mcollina/syncthrough/blob/master/benchmarks/basic.js

  as benchmark.

  R=jarin@chromium.org
  BUG=v8:6376

  Review-Url: https://codereview.chromium.org/2874453002
  Cr-Commit-Position: refs/heads/master@{#45216}

PR-URL: https://github.com/nodejs/node/pull/13162


Reviewed-By: default avatarFranziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: default avatarJames M Snell <jasnell@gmail.com>
parent 0903dcf8
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