Commit Graph

6 Commits

Author SHA1 Message Date
Arthur Eubanks d0acd97c68 [NewPM][LoopUnswitch] Pin loop-unswitch to legacy PM or use simple-loop-unswitch
As mentioned in
http://lists.llvm.org/pipermail/llvm-dev/2020-July/143395.html,
loop-unswitch has not been ported to the NPM. Instead people are using
simple-loop-unswitch.

Pin all tests in Transforms/LoopUnswitch to legacy PM and replace all
other uses of loop-unswitch with simple-loop-unswitch.

One test that didn't fit into the above was
2014-06-21-congruent-constant.ll which seems to only pass with
loop-unswitch. That is also pinned to legacy PM.

Now all tests containing "-loop-unswitch" anywhere in the test succeed with
NPM turned on by default.

Reviewed By: ychen

Differential Revision: https://reviews.llvm.org/D85360
2020-08-06 10:56:00 -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 a496143c9e Update MemorySSA in LoopUnswitch.
Summary:
Update MemorySSA in old LoopUnswitch pass.
Actual dependency and update is disabled by default.

Subscribers: sanjoy, jlebar, Prazek, llvm-commits

Differential Revision: https://reviews.llvm.org/D45301

llvm-svn: 341984
2018-09-11 19:19:21 +00:00
Xin Tong e5f8d643d4 Constant fold switch inst when looking for trivial conditions to unswitch on.
Summary: Constant fold switch inst when looking for trivial conditions to unswitch on.

Reviewers: sanjoy, chenli, hfinkel, efriedma

Subscribers: llvm-commits, mzolotukhin

Differential Revision: https://reviews.llvm.org/D29037

llvm-svn: 293250
2017-01-27 01:42:20 +00:00
Chen Li 145c2f57ae [LoopUnswitch] Improve loop unswitch pass to find trivial unswitch conditions more effectively
Summary:
This patch improves trivial loop unswitch. 

The current trivial loop unswitch only checks if loop header's terminator contains a trivial unswitch condition. But if the loop header only has one reachable successor (due to intentionally or unintentionally missed code simplification), we should consider the successor as part of the loop header. Therefore, instead of stopping at loop header's terminator, we should keep traversing its successors within loop until reach a *real* conditional branch or switch (whose condition can not be constant folded). This change will enable a single -loop-unswitch pass to unswitch multiple trivial conditions (unswitch one trivial condition could open opportunity to unswitch another one in the same loop), while the old implementation can unswitch only one per pass. 

Reviewers: reames, broune

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11481

llvm-svn: 243203
2015-07-25 03:21:06 +00:00