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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
Shawn Landden 24f4085811 [SimplifyCFG] NFC, update Switch tests as a baseline. 
Also add baseline tests to show effect of later patches.

There were a couple of regressions here that were never caught,
but my patch set that this is a preparation to will fix them.

This is the third attempt to land this patch.

Differential Revision: https://reviews.llvm.org/D61150

llvm-svn: 363319
 2019-06-13 19:36:38 +00:00
Shawn Landden 8b142bcc3f [SimplifyCFG] reverting preliminary Switch patches again 
This reverts 363226 and 363227, both NFC intended

I swear I fixed the test case that is failing, and ran
the tests, but I will look into it again.

llvm-svn: 363229
 2019-06-13 05:26:17 +00:00
Shawn Landden c54b2011bd [SimplifyCFG] NFC, update Switch tests to better examine successive patches 
Also add baseline tests to show effect of later patches.

There were a couple of regressions here that were never caught,
but my patch set that this is a preparation to will fix them.

Differential Revision: https://reviews.llvm.org/D61150

llvm-svn: 363226
 2019-06-13 04:51:35 +00:00
Shawn Landden c6cba2957d [SimplifyCFG] revert the last commit. 
I ran ALL the test suite locally, so I will look into this...

llvm-svn: 363223
 2019-06-13 02:47:47 +00:00
Shawn Landden f93b99b2b6 [SimplifyCFG] NFC, update Switch tests to HEAD so I can 
see if my changes change anything

Also add baseline tests to show effect of later patches.

Differential Revision: https://reviews.llvm.org/D61150

llvm-svn: 363222
 2019-06-13 02:24:24 +00:00
Shawn Landden 343578759e [SimplifyCFG] back out all SwitchInst commits 
They caused the sanitizer builds to fail.

My suspicion is the change the countLeadingZeros().

llvm-svn: 361736
 2019-05-26 18:15:51 +00:00
Shawn Landden 50c73a044f [SimplifyCFG] NFC, update Switch tests to HEAD so I can see if my changes change anything 
Also add baseline tests to show effect of later patches.

llvm-svn: 361725
 2019-05-26 13:52:41 +00:00
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
Sam Parker 71efbe4c68 [ARM] Implement isTruncateFree 
Implement the isTruncateFree hooks, lifted from AArch64, that are
used by TargetTransformInfo. This allows simplifycfg to reduce the
test case into a single basic block.

Differential Revision: https://reviews.llvm.org/D37516

llvm-svn: 313533
 2017-09-18 14:28:51 +00:00