• jgruber's avatar
    [regexp] Add a RegExp.p.exec fast path for ATOM regexps · b1ee17e5
    jgruber authored
    Until now, ATOM regexps (i.e. simple patterns don't require regexp matching
    logic but can use generic string matching algorithms instead) have always gone
    through the slow runtime.
    
    This CL implements a fast path in CSA which simply calls StringIndexOf
    internally and then sets up the last-match-info as required.
    
    Local microbenchmarks show a 30% improvement for RE.p.exec on ATOM regexps,
    and a 5% improvement on Octane/RegExp.
    
    Bug: v8:6462
    Change-Id: I35b4c5caf416fa35fe388dd58e34dea55b098d09
    Reviewed-on: https://chromium-review.googlesource.com/535455
    Commit-Queue: Jakob Gruber <jgruber@chromium.org>
    Reviewed-by: 's avatarCamillo Bruni <cbruni@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#45947}
    b1ee17e5
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