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* Update aosp/master LLVM for rebase to r222494.Stephen Hines2014-12-021-2/+21
| | | | Change-Id: Ic787f5e0124df789bd26f3f24680f45e678eef2d
* SCEV: Make the final add of an inbounds GEP nuw if we know that the index is ↵Benjamin Kramer2013-10-281-2/+38
| | | | | | | | | | | | | | | | | | | | | | | positive. We can't do this for the general case as saying a GEP with a negative index doesn't have unsigned wrap isn't valid for negative indices. %gep = getelementptr inbounds i32* %p, i64 -1 But an inbounds GEP cannot run past the end of address space. So we check for the very common case of a positive index and make GEPs derived from that NUW. Together with Andy's recent non-unit stride work this lets us analyze loops like void foo3(int *a, int *b) { for (; a < b; a++) {} } PR12375, PR12376. Differential Revision: http://llvm-reviews.chandlerc.com/D2033 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193514 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert "SCEV: When expanding a GEP the final addition to the base pointer ↵Benjamin Kramer2012-04-171-2/+2
| | | | | | | | has NUW but not NSW." This isn't right either, reverting for now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154910 91177308-0d34-0410-b5e6-96231b3b80d8
* SCEV: When expanding a GEP the final addition to the base pointer has NUW ↵Benjamin Kramer2012-04-071-2/+2
| | | | | | | | but not NSW. Found by inspection. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154262 91177308-0d34-0410-b5e6-96231b3b80d8
* SCEV fix. In general, Add/Mul expressions should not inherit NSW/NUW.Andrew Trick2011-11-291-1/+19
| | | | | | | | This reverts r139450, fixes r139453, and adds much needed comments and a unit test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145367 91177308-0d34-0410-b5e6-96231b3b80d8
* Propagate SCEV no-wrap flags whenever possible.Andrew Trick2011-03-151-6/+6
| | | | | | | This needs review. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127638 91177308-0d34-0410-b5e6-96231b3b80d8
* teach SCEV that the scale and addition of an inbounds gep don't NSW.Chris Lattner2011-02-131-0/+28
| | | | | | | | This fixes a FIXME in scev-aa.ll (allowing a new no-alias result) and generally makes things more precise. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125449 91177308-0d34-0410-b5e6-96231b3b80d8
* Per discussion with Dan G, inbounds geps *certainly* can haveChris Lattner2011-02-111-2/+2
| | | | | | | | | | | | unsigned overflow (e.g. "gep P, -1"), and while they can have signed wrap in theoretical situations, modelling an AddRec as not having signed wrap is going enough for any case we can think of today. In the future if this isn't enough, we can revisit this. Modeling them as having NUW isn't causing any known problems either FWIW. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125410 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert the testcase from the previous reverted commit.Eric Christopher2011-01-111-2/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123227 91177308-0d34-0410-b5e6-96231b3b80d8
* add a testcase I missed in previous commit.Chris Lattner2011-01-091-0/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123143 91177308-0d34-0410-b5e6-96231b3b80d8
* teach SCEV analysis of PHI nodes that PHI recurences formedChris Lattner2011-01-091-2/+40
| | | | | | | | with GEP instructions are always NUW, because PHIs cannot wrap the end of the address space. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123105 91177308-0d34-0410-b5e6-96231b3b80d8
* reduce indentation. Print <nuw> and <nsw> when dumping SCEV AddRec'sChris Lattner2011-01-091-1/+1
| | | | | | | that have the bit set. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123104 91177308-0d34-0410-b5e6-96231b3b80d8
* -disable-output is no longer needed with -analyze.Dan Gohman2010-01-261-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94574 91177308-0d34-0410-b5e6-96231b3b80d8
* Use WriteAsOperand instead of getName() to print loop header names,Dan Gohman2010-01-091-1/+1
| | | | | | | so that unnamed blocks are handled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93059 91177308-0d34-0410-b5e6-96231b3b80d8
* Change tests from "opt %s" to "opt < %s" so that opt doesn't see theDan Gohman2009-09-111-1/+1
| | | | | | | | | input filename so that opt doesn't print the input filename in the output so that grep lines in the tests don't unintentionally match strings in the input filename. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81537 91177308-0d34-0410-b5e6-96231b3b80d8
* Change these tests to feed the assembly files to opt directly, insteadDan Gohman2009-09-081-1/+1
| | | | | | | of using llvm-as, now that opt supports this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81226 91177308-0d34-0410-b5e6-96231b3b80d8
* Change the assembly syntax for nsw, nuw, and exact, putting themDan Gohman2009-07-271-1/+1
| | | | | | | | after their associated opcodes rather than before. This makes them a little easier to read. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77194 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach ScalarEvolution to make use of no-overflow flags whenDan Gohman2009-07-251-0/+40
analyzing add recurrences. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77034 91177308-0d34-0410-b5e6-96231b3b80d8
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