• jacob.bramley's avatar
    [arm64] Use SP-offset rather than FP-offset. · dad635ee
    jacob.bramley authored
    A64 loads and stores can have much larger positive than negative
    immediate offsets, and since most frame slots are below fp, we can
    significantly improve accesses by basing them on sp instead. Typical
    example:
    
        Before                  After
        mov x16, #-416
        str x20, [fp, x16]      str x20, [jssp, #32]
    
    Notable benchmark results include lua_binarytrees, which improves by
    about 7.5% on A57 and 5% on A53. Several other asm.js benchmarks gain
    2-4%.
    
    Review URL: https://codereview.chromium.org/1376173003
    
    Cr-Commit-Position: refs/heads/master@{#32111}
    dad635ee
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