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11 Commits

Author SHA1 Message Date
Arthur Eubanks 5249e6f248 [LoopSimplifyCFG][NewPM] Rename simplify-cfg -> loop-simplifycfg 
This matches the legacy PM name and makes all tests in
Transforms/LoopSimplifyCFG pass under NPM.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D87948
 2020-09-21 08:27:19 -07:00
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
Alina Sbirlea d2d3244363 [LoopSimplifyCFG] Update MemorySSA after r353911. 
Summary:
MemorySSA is not properly updated in LoopSimplifyCFG after recent changes. Use SplitBlock utility to resolve that and clear all updates once handleDeadExits is finished.
All updates that follow are removal of edges which are safe to handle via the removeEdge() API.
Also, deleting dead blocks is done correctly as is, i.e. delete from MemorySSA before updating the CFG and DT.

Reviewers: mkazantsev, rtereshin

Subscribers: sanjoy, jlebar, Prazek, george.burgess.iv, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58524

llvm-svn: 354613
 2019-02-21 19:54:05 +00:00
Max Kazantsev 10489d76f6 [LoopSimplifyCFG] Add missing MSSA edge deletion 
When we create fictive switch in preheader, we should take
care about MSSA and delete edge between old preheader and
header.

llvm-svn: 354547
 2019-02-21 05:51:29 +00:00
Max Kazantsev 6bf861597c [LoopSimplifyCFG] Pay respect to LCSSA when removing dead blocks 
Utility function that we use for blocks deletion always unconditionally removes
one-input Phis. In LoopSimplifyCFG, it can lead to breach of LCSSA form.
This patch alters this function to keep them if needed.

Differential Revision: https://reviews.llvm.org/D57231
Reviewed By: fedor.sergeev

llvm-svn: 353803
 2019-02-12 07:48:07 +00:00
Max Kazantsev e5116e9b4a [NFC] Add failing test on LCSSA forming 
llvm-svn: 352190
 2019-01-25 11:32:21 +00:00
Max Kazantsev 61a8d3fb33 [LoopSimplifyCFG] Form LCSSA when a parent loop becomes a sibling 
During the transforms in LoopSimplifyCFG, when we remove a dead exiting edge, the
parent loop may stop being reachable from the child loop, and therefore they become
siblings. If the former child loop had uses of some values from its former parent loop,
now such uses will require LCSSA Phis, even if they weren't needed before. So we must
form LCSSA for all loops that stopped being ancestors of the current loop in this case.

Differential Revision: https://reviews.llvm.org/D56144
Reviewed By: fedor.sergeev

llvm-svn: 351434
 2019-01-17 12:51:10 +00:00
Max Kazantsev 8f70c9bf49 [NFC] Add failing test on LCSSA form preservation of LoopSimplifyCFG 
llvm-svn: 350119
 2018-12-28 10:43:37 +00:00
Max Kazantsev e1c2dc27d3 Disable LoopSimplifyCFG terminator folding by default 
llvm-svn: 347486
 2018-11-23 09:14:53 +00:00
Max Kazantsev cb8e240334 [LoopSimplifyCFG] Don't delete LCSSA Phis 
When removing edges, we also update Phi inputs and may end up removing
a Phi if it has only one input. We should not do it for edges that leave the current
loop because these Phis are LCSSA Phis and need to be preserved.

Thanks @dmgreen	for finding this!

Differential Revision: https://reviews.llvm.org/D54841

llvm-svn: 347484
 2018-11-23 07:56:47 +00:00