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7 Commits

Author SHA1 Message Date
Roman Lebedev
ec0b671a61
[SimplifyCFG] Teach SimplifyCondBranchToCondBranch() to preserve DomTree 2020-12-30 00:48:12 +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
5cce4aff18
[SimplifyCFG] TryToSimplifyUncondBranchFromEmptyBlock() 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
Sanjay Patel
89b19e8959 [SimplifyCFG] add test for chain of empty block conditional branches; NFC 2020-03-13 14:39:31 -04:00
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
Louis Gerbarg
1f54b82164 Add ExtractValue instruction to SimplifyCFG's ComputeSpeculationCost 
Since ExtractValue is not included in ComputeSpeculationCost CFGs containing
ExtractValueInsts cannot be simplified. In particular this interacts with
InstCombineCompare's tendency to insert add.with.overflow intrinsics for
certain idiomatic math operations, preventing optimization.

This patch adds ExtractValue to the ComputeSpeculationCost. Test case included

rdar://14853450

llvm-svn: 208434
 2014-05-09 17:02:46 +00:00