wangtao
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
308,693 Commits 29 Branches 0 Tags 2.2 GiB
Commit Graph

5 Commits

Author SHA1 Message Date
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