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Author SHA1 Message Date
Nikita Popov 971a2ae8b3 [LoopUnroll] Regenerate test checks (NFC) 2021-05-24 17:26:07 +02:00
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
Michael Zolotukhin 1a554be3b6 [LoopSimplify] When simplifying phis in loop-simplify, do it only if it preserves LCSSA form. 
llvm-svn: 282541
 2016-09-27 21:03:45 +00:00
Michael Zolotukhin d734bea8ba [LoopUnrolling] Fix a bug introduced in r259869 (PR26688). 
The issue was that we only required LCSSA rebuilding if the immediate
parent-loop had values used outside of it. The fix is to enaable the
same logic for all outer loops, not only immediate parent.

llvm-svn: 261575
 2016-02-22 21:21:45 +00:00
Michael Zolotukhin 8ef44f93ca Don't recompute LCSSA after loop-unrolling when possible. 
Summary:
Currently we always recompute LCSSA for outer loops after unrolling an
inner loop. That leads to compile time problem when we have big loop
nests, and we can solve it by avoiding unnecessary work. For instance,
if w eonly do partial unrolling, we don't break LCSSA, so we don't need
to rebuild it. Also, if all exits from the inner loop are inside the
enclosing loop, then complete unrolling won't break LCSSA either.

I replaced unconditional LCSSA recomputation with conditional recomputation +
unconditional assert and added several tests, which were failing when I
experimented with it.

Soon I plan to follow up with a similar patch for recalculation of dominators
tree.

Reviewers: hfinkel, dexonsmith, bogner, joker.eph, chandlerc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D14526

llvm-svn: 253126
 2015-11-14 05:51:41 +00:00