5 Commits

Author	SHA1	Message	Date
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