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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:Yang Guo <yangguo@chromium.org> Commit-Queue: Clemens Backes <clemensb@chromium.org> Cr-Commit-Position: refs/heads/master@{#64851}
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