• bmeurer's avatar
    [builtins] Introduce proper Float64Log1p operator. · 7ceed92a
    bmeurer authored
    Import base::ieee754::log1p() from fdlibm and introduce a Float64Log1p
    TurboFan operator based on that, similar to what we do for Float64Log.
    Rewrite Math.log1p() as TurboFan builtin and use that operator to also
    inline Math.log1p() into optimized TurboFan functions.
    
    Also unify the handling of the special IEEE 754 functions somewhat in
    the TurboFan backends. At some point we can hopefully express this
    completely in the InstructionSelector (once we have an idea what to do
    with the ST(0) return issue on IA-32/X87).
    
    Drive-by-fix: Add some more test coverage for the log function.
    
    R=yangguo@chromium.org
    BUG=v8:5086,v8:5092
    
    Review-Url: https://codereview.chromium.org/2060743002
    Cr-Commit-Position: refs/heads/master@{#36914}
    7ceed92a
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