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* Revert "Temporarily Revert "Add basic loop fusion pass.""Eric Christopher2019-04-171-0/+56
| | | | | | | | The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
* Temporarily Revert "Add basic loop fusion pass."Eric Christopher2019-04-171-56/+0
| | | | | | | | As it's causing some bot failures (and per request from kbarton). This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda. llvm-svn: 358546
* [LCSSA] Do not remove used PHI nodes in formLCSSAForInstructionsBjorn Pettersson2018-05-081-0/+56
Summary: In formLCSSAForInstructions we speculatively add new PHI nodes, that sometimes ends up without having any uses. It has been discovered that sometimes an added PHI node can appear as being unused in one iteration of the Worklist, although it can end up being used by a PHI node added in a later iteration. We now check, a second time, that the PHI node still is unused before we remove it. This avoids an assert about "Trying to remove a phi with uses." for the added test case. Reviewers: davide, mzolotukhin, mattd, dberlin Reviewed By: mzolotukhin, dberlin Subscribers: dberlin, mzolotukhin, davide, bjope, uabelho, llvm-commits Differential Revision: https://reviews.llvm.org/D46422 llvm-svn: 331741
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