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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: Tobias Tebbi <tebbi@chromium.org> Commit-Queue: Ross McIlroy <rmcilroy@chromium.org> Cr-Commit-Position: refs/heads/master@{#69107}
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