[Webkit-unassigned] [Bug 46719] New: YARR JIT should fallback to YARR Interpreter instead of PCRE

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=46719

           Summary: YARR JIT should fallback to YARR Interpreter instead
                    of PCRE
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pvarga at inf.u-szeged.hu
                CC: ggaren at apple.com, barraclough at apple.com,
                    zherczeg at webkit.org, ossy at webkit.org,
                    msaboff at apple.com


The time has come to change the YARR JIT's fallback from PCRE to YARR Interpreter.
Now the regexp matching by Interpreter seems faster.

Additionally PCRE causes some regressions:

eg.: 
  - in JavaScriptCore tests:
       ecma_3/RegExp/15.10.2-1.js
       ecma_3/RegExp/regress-209919.js
  - in fast/js tests:
       fast/js/regexp-look-ahead-empty.html
       fast/js/regexp-overflow.html
       fast/js/sputnik/Conformance/15_Native_Objects/15.10_RegExp/15.10.2/15.10.2.5_Term/S15.10.2.5_A1_T4.html
       fast/js/sputnik/Conformance/15_Native_Objects/15.10_RegExp/15.10.2/15.10.2.8_Atom/S15.10.2.8_A2_T1.html
       fast/js/sputnik/Conformance/15_Native_Objects/15.10_RegExp/15.10.6/15.10.6.2_RegExp.prototype.exec/S15.10.6.2_A1_T6.html

Here is an old bugreport related to this regression issue:
https://bugs.webkit.org/show_bug.cgi?id=38117

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