[Webkit-unassigned] [Bug 20796] New: Combine op_eq and op_lesseq with op_jfalse

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=20796

           Summary: Combine op_eq and op_lesseq with op_jfalse
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Enhancement
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: loki at inf.u-szeged.hu


I have found that op_eq and op_jfalse instructions appear 441683 times (0.72%)
and op_lesseq and op_jfalse are 340196 times (0.55%) in SunSpider.

These two instruction pair mostly come up in condition fields, where the
results of the binary operator never used after the jump.

So it is possible to introduce two super-instructions for those cases (like
op_jnless).
I have implemented these op_jneq and op_jnlesseq instructions, and the result
is 0.8% progression in SunSpider.


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