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    • bmeurer's avatar
      [turbofan] Introduce a TransitionElementsKind simplified operator. · 908cd09f
      bmeurer authored
      Instead of wriring the elements kind transitions into the control flow
      early on, we do instead put this marker into the effect chain, so that
      the elements transitions are visible to the LoadElimination and can
      thus be optimized properly there.
      
      This CL itself doesn't add any of those optimizations, but just adds
      the foundations to make them possible later.
      
      R=jarin@chromium.org
      BUG=v8:4930,v8:5141
      
      Review-Url: https://codereview.chromium.org/2164573003
      Cr-Commit-Position: refs/heads/master@{#37869}
      908cd09f
  12. 12 May, 2016 1 commit
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  17. 07 Mar, 2016 6 commits
  18. 29 Jan, 2016 1 commit
    • jkummerow's avatar
      Introduce {FAST,SLOW}_STRING_WRAPPER_ELEMENTS · f4872f74
      jkummerow authored
      String wrappers (new String("foo")) are special objects: their string
      characters are accessed like elements, and they also have an elements
      backing store. This used to require a bunch of explicit checks like:
      
      if (obj->IsJSValue() && JSValue::cast(obj)->value()->IsString()) {
        /* Handle string characters */
      }
      // Handle regular elements (for string wrappers and other objects)
      obj->GetElementsAccessor()->Whatever(...);
      
      This CL introduces new ElementsKinds for string wrapper objects (one for
      fast elements, one for dictionary elements), which allow folding the
      special-casing into new StringWrapperElementsAccessors.
      
      No observable change in behavior is intended.
      
      Review URL: https://codereview.chromium.org/1612323003
      
      Cr-Commit-Position: refs/heads/master@{#33616}
      f4872f74
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