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* Transform -X/C to X/-C, implementing a README.txt entry.Dan Gohman2009-08-12
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* Remove a couple of already-implemented notes.Eli Friedman2009-07-21
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* Move PR4517 to README.txt.Nick Lewycky2009-07-09
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* Factor the code for collecting IV users out of LSR into an IVUsers class,Dan Gohman2009-05-12
| | | | | | | | | | | | | | | | | | | | | | | | | and generalize it so that it can be used by IndVarSimplify. Implement the base IndVarSimplify transformation code using IVUsers. This removes TestOrigIVForWrap and associated code, as ScalarEvolution now has enough builtin overflow detection and folding logic to handle all the same cases, and more. Run "opt -iv-users -analyze -disable-output" on your favorite loop for an example of what IVUsers does. This lets IndVarSimplify eliminate IV casts and compute trip counts in more cases. Also, this happens to finally fix the remaining testcases in PR1301. Now that IndVarSimplify is being more aggressive, it occasionally runs into the problem where ScalarEvolutionExpander's code for avoiding duplicate expansions makes it difficult to ensure that all expanded instructions dominate all the instructions that will use them. As a temporary measure, IndVarSimplify now uses a FixUsesBeforeDefs function to fix up instructions inserted by SCEVExpander. Fortunately, this code is contained, and can be easily removed once a more comprehensive solution is available. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71535 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix two wording errors that Duncan spotted.Dan Gohman2009-05-11
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* LLVM has unaligned loads and stores now.Dan Gohman2009-05-11
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* Upgrade this example to new-style syntax.Dan Gohman2009-05-11
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* remove some done things: we have nocapture and SROA is smarter.Chris Lattner2009-05-11
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* add a noteChris Lattner2009-05-11
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* Remove a completed optimization. Add a potential optimization I ran Eli Friedman2009-05-09
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* add a noteChris Lattner2009-03-28
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* Add a totally synthetic situation I came up with while looking at a bug inNick Lewycky2009-02-25
| | | | | | | related code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65437 91177308-0d34-0410-b5e6-96231b3b80d8
* add note about sinTorok Edwin2009-02-20
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* add note about possible GEP improvement with fields of size 0.Torok Edwin2009-01-24
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* add a noteChris Lattner2009-01-22
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* Add a README entry noticed while investigating PR3216.Dan Gohman2009-01-20
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* add some more crazy strlen and memcpy stuff I noticed in spec.Chris Lattner2009-01-08
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* add some notes about strlen craziness in eon.Chris Lattner2009-01-08
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* add a noteChris Lattner2008-12-31
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* add some notes for simplifylibcalls optimizationsChris Lattner2008-12-23
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* add some more notes.Chris Lattner2008-12-15
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* Add a testcase for GCC PR 23455, which lpre handles now. Add someChris Lattner2008-12-15
| | | | | | | comments about why we're not getting other cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61032 91177308-0d34-0410-b5e6-96231b3b80d8
* gvn now hoists this load out of the hot non-call path.Chris Lattner2008-12-15
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* move an entry, add some notes, remove a completed item (IMPLICIT_DEF)Chris Lattner2008-12-10
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* improve a note.Chris Lattner2008-12-07
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* some more PRE/GVN/DSE related notes.Chris Lattner2008-12-06
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* some random notes.Chris Lattner2008-12-06
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* add a noteChris Lattner2008-12-02
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* - Remove the buggy -X/C -> X/-C transform. This isn't valid when X isn't aBill Wendling2008-12-02
| | | | | | | | | | constant. If X is a constant, then this is folded elsewhere. - Added a note to Target/README.txt to indicate that we'd like to implement this when we're able. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60399 91177308-0d34-0410-b5e6-96231b3b80d8
* Implement ((A|B)&1)|(B&-2) -> (A&1) | B transformation. This also takes care ofBill Wendling2008-12-01
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* Add instruction combining for ((A&~B)|(~A&B)) -> A^B and all permutations.Bill Wendling2008-11-30
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* Implement (A&((~A)|B)) -> A&B transformation in the instruction combiner. ThisBill Wendling2008-11-30
| | | | | | | takes care of all permutations of this pattern. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60290 91177308-0d34-0410-b5e6-96231b3b80d8
* Moving potential optimizations out of PR2330 into lib/Target/README.txt. Eli Friedman2008-11-30
| | | | | | | | Hopefully this isn't too much stuff to dump into this file. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60285 91177308-0d34-0410-b5e6-96231b3b80d8
* Also update the README.Nick Lewycky2008-11-27
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* Add a synthetic missed optimization.Nick Lewycky2008-11-27
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* move the note to the correct READMETorok Edwin2008-10-24
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* add note about va_arg code on x86 and x86-64Torok Edwin2008-10-24
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* This is now partly done.Dan Gohman2008-10-17
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* move PR1941 here.Chris Lattner2008-10-15
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* move PR1604 here.Chris Lattner2008-10-15
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* move PR1488 into this file.Chris Lattner2008-10-15
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* add a noteChris Lattner2008-10-15
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* this case is matched now.Chris Lattner2008-10-05
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* add a noteChris Lattner2008-08-19
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* move some more stuff out of my email into readme.txtChris Lattner2008-08-10
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* add a noteChris Lattner2008-08-10
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* Add a note.Chris Lattner2008-07-14
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* Peer through sext/zext when looking for not(cmp).Nick Lewycky2008-05-31
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* Yay us! Every one of these examples turns into icmp/zext/ret.Nick Lewycky2008-05-31
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* trip count computation deficiencyChris Lattner2008-05-17
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