• Ross McIlroy's avatar
    [TurboProp] Add support for spill slot allocation to fast reg alloc · 5b0c6cde
    Ross McIlroy authored
    Adds support for tracking the instruction range of spilled operands,
    and then allocating spill slots to these ranges. It also adds some
    unittests covering spill slot allocation.
    
    Spill slots are allocated in a linear fashion, running through the
    instruction stream in a linear order, ensuring that no spill operand
    is allocated to a same spill slot that is already assigned to during
    this whole start / end range. This isn’t optimal, since it doesn’t
    take into account holes in these ranges (e.g, blocks between start
    and end that aren’t dominated by the start), but in practice rarely
    leads to more than one extra spill slot being allocated compared to
    the current allocator.
    
    BUG=v8:9684
    
    Change-Id: Iedee7bcf552080e5b4b6a2f4e96b78b6c1396cab
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2297470Reviewed-by: 's avatarTobias Tebbi <tebbi@chromium.org>
    Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#69107}
    5b0c6cde
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