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Author SHA1 Message Date
Roman Lebedev d4c0abb4a3
[SimplifyCFG] Teach FoldCondBranchOnPHI() to preserve DomTree 2020-12-30 00:48:11 +03:00
Roman Lebedev b43b77ff9b
[NFCI][SimlifyCFG] simplifyOnce(): also perform DomTree validation 
And that exposes that a number of tests don't *actually* manage to
maintain DomTree validity, which is inline with my observations.

Once again, SimlifyCFG pass currently does not require/preserve DomTree
by default, so this is effectively NFC.
 2020-12-20 00:18:32 +03:00
Roman Lebedev 49dac4aca0
[SimplifyCFG] MergeBlockIntoPredecessor() already knows how to preserve DomTree 
... so just ensure that we pass DomTreeUpdater it into it.

Fixes DomTree preservation for a large number of tests,
all of which are marked as such so that they do not regress.
 2020-12-17 01:03:49 +03:00
Nikita Popov a48cf72238 [InstSimplify] Handle not inserted instruction gracefully (PR46638) 
When simplifying comparisons using a dominating assume, bail out
if the context instruction is not inserted.
 2020-07-08 21:43:32 +02:00