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Author SHA1 Message Date
Roman Lebedev 4be8707e64
[SimplifyCFG] Teach FoldTwoEntryPHINode() to preserve DomTree 
Still boring, simply drop all edges to successors of DomBlock,
and add an edge to to BB instead.
 2020-12-20 00:18:33 +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
Eric Christopher cee313d288 Revert "Temporarily Revert "Add basic loop fusion pass."" 
The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552
 2019-04-17 04:52:47 +00:00
Eric Christopher a863435128 Temporarily Revert "Add basic loop fusion pass." 
As it's causing some bot failures (and per request from kbarton).

This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.

llvm-svn: 358546
 2019-04-17 02:12:23 +00:00
Matt Arsenault c8fc08c31b Make bitcast, extractelement, and insertelement considered cheap for speculation. 
This helps more branches into selects. On R600,
vectors are cheap and anything that helps
remove branches is very good.

llvm-svn: 209914
 2014-05-30 18:34:43 +00:00