• mbrandy's avatar
    PPC: [builtins] Make Math.max and Math.min fast by default. · 3641a448
    mbrandy authored
    Port cb9b8010
    
    Original commit message:
        The previous versions of Math.max and Math.min made it difficult to
        optimize those (that's why we already have custom code in Crankshaft),
        and due to lack of ideas what to do about the variable number of
        arguments, we will probably need to stick in special code in TurboFan
        as well; so inlining those builtins is off the table, hence there's no
        real advantage in having them around as "not quite JS" with extra work
        necessary in the optimizing compilers to still make those builtins
        somewhat fast in cases where we cannot inline them (also there's a
        tricky deopt loop in Crankshaft related to Math.min and Math.max, but
        that will be dealt with later).
    
        So to sum up: Instead of trying to make Math.max and Math.min semi-fast
        in the optimizing compilers with weird work-arounds support %_Arguments
        %_ArgumentsLength, we do provide the optimal code as native builtins
        instead and call it a day (which gives a nice performance boost on some
        benchmarks).
    
    R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
    BUG=
    
    Review URL: https://codereview.chromium.org/1648353002
    
    Cr-Commit-Position: refs/heads/master@{#33618}
    3641a448
macro-assembler-ppc.cc 135 KB