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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 164e0847a5
[SimplifyCFG] DeleteDeadBlock() 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.
 2020-12-18 00:37:21 +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
Alex Bradbury 130b8b3f2b [RISCV] Implement isTruncateFree 
Adapted from ARM's implementation introduced in r313533 and r314280.

llvm-svn: 330940
 2018-04-26 13:37:00 +00:00