[Webkit-unassigned] [Bug 63505] DFG JIT lacks array.length caching

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63505





--- Comment #9 from Filip Pizlo <fpizlo at apple.com>  2011-06-28 17:49:05 PST ---
Array length caching is mainly for v8, not sunspider, and is a win (see attached).  The replaceWithJump portion is not a win on either v8 or sunspider, so I've removed it.


TEST              COMPARISON            FROM                 TO             DETAILS

=============================================================================

** TOTAL **:      1.038x as fast    1248.1ms +/- 0.5%   1202.2ms +/- 0.3%     significant

=============================================================================

  v8:             1.038x as fast    1248.1ms +/- 0.5%   1202.2ms +/- 0.3%     significant
    crypto:       -                   92.8ms +/- 0.8%     92.3ms +/- 0.4% 
    deltablue:    1.148x as fast     329.7ms +/- 0.4%    287.1ms +/- 0.5%     significant
    earley-boyer: -                  149.7ms +/- 1.3%    147.6ms +/- 1.0% 
    raytrace:     -                  102.8ms +/- 3.6%    101.3ms +/- 1.0% 
    regexp:       -                  117.5ms +/- 0.6%    117.2ms +/- 0.4% 
    richards:     ??                 245.3ms +/- 0.9%    245.7ms +/- 0.7%     not conclusive: might be *1.002x as slow*
    splay:        ??                 210.3ms +/- 0.7%    211.0ms +/- 0.8%     not conclusive: might be *1.003x as slow*

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