• Clemens Backes's avatar
    [utils] Move {WhichPowerOf2} to base::bits · fa056cd0
    Clemens Backes authored
    {WhichPowerOf2} is basically the same as {CountTrailingZeros}, with a
    restriction to powers of two. Since it does not use or depend on any v8
    internals, it can be moved to src/base/bits.h.
    This CL also changes the implementation to use the CTZ builtin if
    available, and falls back to popcnt otherwise.
    
    Drive-by: Make it constexpr, and rename to {WhichPowerOfTwo}.
    
    R=sigurds@chromium.org
    
    Bug: v8:9810, v8:8912
    Change-Id: I8368d098f9ab1247f3b9f036f1385a38de10cc6a
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1903966Reviewed-by: 's avatarYang Guo <yangguo@chromium.org>
    Commit-Queue: Clemens Backes <clemensb@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#64851}
    fa056cd0
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