580036 - JM: PIC for arguments.length

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

[David Mandelin [:dmandelin]]

See earley-boyer line 4185:

  function sc_list() {
    var res = null;
    var a = arguments;
    for (var i = a.length-1; i >= 0; i--)  // a.length gets PIC misses
      res = new sc_Pair(a[i], res);
    return res;
  }

Probably only a small speedup, but we will want it.

Comment 1

[David Anderson [:dvander] - inactive, e-mail if emergency]

this is a quickie so taking. looks like ~5% win on earley-boyer.

http://hg.mozilla.org/users/danderson_mozilla.com/moo/rev/5408e0e3863b