| commit | 90888ed97b5b3c0d104b2e9f28e5b74c1b0d07dd | [log] [tgz] |
|---|---|---|
| author | Giovanni Bajo <rasky@develer.com> | Sun Oct 13 01:30:51 2019 +0200 |
| committer | Giovanni Bajo <rasky@develer.com> | Mon Oct 14 21:29:11 2019 +0000 |
| tree | 486889c06d1a7a86c5bb3ec60f29b83fd36302b9 | |
| parent | 233f45499b7f3a775311b824ac53bbe67e811e1f [diff] |
cmd/compile: in poset, change the way inequality is recorded Before this CL, inequality was recorded in a bit matrix using SSA IDs. This allowed to record inequality for SSA values that we didn't know any relation in the partial order of. Unfortunately, this also means that inequality is harder to use within the poset itself as there is not fast way to map from internal poset indices and SSA values. Since we will need to check for inequality in following CLs within code that lost track of SSA values, switch to use a bit matrix of poset indices instead. This requires always allocate a poset node (as a new root) for values that are first seen in a SetNonEqual call, but it doesn't sound like a big problem. The other solution (creating and maintaining a reverse map from poset indices to SSA values) seem more complicated and memory hungry. Change-Id: Ic917485abbe70aef7ad6fa98408e5430328b6cd9 Reviewed-on: https://go-review.googlesource.com/c/go/+/196782 Run-TryBot: Giovanni Bajo <rasky@develer.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
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