• bmeurer's avatar
    [turbofan] Lower StringCharCodeAt to a dedicated builtin. · 86e2a199
    bmeurer authored
    Introduce a dedicated StringCharCodeAt builtin, that performs the core
    logic of String.prototype.charCodeAt and lower the StringCharCodeAt
    simplified operator to a call to this builtin rather than inlining the
    full functionality into each and every TurboFan graph using it. This can
    significantly reduce compile time in some cases (i.e. can easily shave
    off over 50% of compile time overhead for small functions that call
    String.prototype.charCodeAt).
    
    Currently it returns the char code as TaggedSigned value, but
    middle-term we should make it possible to return untagged values
    from builtins.
    
    R=yangguo@chromium.org
    
    Review-Url: https://codereview.chromium.org/2600443002
    Cr-Commit-Position: refs/heads/master@{#41912}
    86e2a199
code-factory.cc 15.5 KB