553443d41f
Here begins a pretty major rewrite of the prove pass. The fundamental observation is that although keeping facts about relations between two SSA values could use O(n^2) space, keeping facts about relations between an SSA value and constants needs only O(n) space. We can just keep track of min/max for every SSA value at little cost. Redo the limit table to just keep track of limits for all SSA values. Use just a slice instead of a map. It may use more space (but still just O(n) space), but accesses are a lot faster. And with the cache in the compiler, that space will be reused quickly. This is part of my planning to add lots more constant limits in the prove pass. Change-Id: Ie36819fad5631a8b79c3630fe0e819521796551a Reviewed-on: https://go-review.googlesource.com/c/go/+/599255 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> |
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