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path: root/lib/Analysis/ScalarEvolution.cpp
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2011-03-14HowFarToZero can compute a trip count as long as the recurrence has ↵Andrew Trick
no-self-wrap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127591 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-14Added SCEV::NoWrapFlags to manage unsigned, signed, and self wrapAndrew Trick
properties. Added the self-wrap flag for SCEV::AddRecExpr. A slew of temporary FIXMEs indicate the intention of the no-self-wrap flag without changing behavior in this revision. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127590 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-09When SCEV can determine the loop test is X < X, set ExactBECount=0.Andrew Trick
When ExactBECount is a constant, use it for MaxBECount. When MaxBECount cannot be computed, replace it with ExactBECount. Fixes PR9424. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127342 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-09whitespaceAndrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127340 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-13teach SCEV that the scale and addition of an inbounds gep don't NSW.Chris Lattner
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
2011-02-11Per discussion with Dan G, inbounds geps *certainly* can haveChris Lattner
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
2011-01-26Fix memory corruption. If one of the SCEV creation functions calls another butNick Lewycky
doesn't return immediately after then the insert position in UniqueSCEVs will be out of date. No test because this is a memory corruption issue. Fixes PR9051! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124282 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-24Add a comment.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124126 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23Simplify some code with no functionality change. Make the test a lot moreNick Lewycky
robust against smarter optimizations, using the power of FileCheck. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124081 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23Use value ranges to fold ext(trunc) in SCEV when possible.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124062 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-22Have SCEV turn sext(x) into zext(x) when x is s>= 0. This applies many times inNick Lewycky
"make check" alone. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124046 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-19Similarly, analyze truncate through multiply.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123842 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-19Add a missed SCEV fold that is required to continue analyzing the IR producedNick Lewycky
by indvars through the scev expander. trunc(add x, y) --> add(trunc x, y). Currently SCEV largely folds the other way which is probably wrong, but preserved to minimize churn. Instcombine doesn't do this fold either, demonstrating a missed optz'n opportunity on code doing add+trunc+add. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123838 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-19Add a missing SCEV simplification sext(zext x) --> zext x.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123832 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-11some comment improvements.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123243 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-11Temporarily revert 123133, it's causing some regressions and I'm tryingEric Christopher
to get a testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123225 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-11the GEP faq says that only inbounds geps are guaranteed to not overflow.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123218 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09add a fixme: ir isn't expressive enough.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123139 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09Step #4 in improving trip count analysis: HowFarToZero can analyzeChris Lattner
NUW AddRec's much more aggressively. We now get a trip count for @test2 in nsw.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123138 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09rearrange some code, no functionality change.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123136 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09Step #3 to improving trip count analysis: If we foldChris Lattner
a + {b,+,stride} into {a+b,+,stride} (because a is LIV), then the resultant AddRec is NUW/NSW if the client says it is. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123133 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09Step #2 to improve trip count analysis for loops like this:Chris Lattner
void f(int* begin, int* end) { std::fill(begin, end, 0); } which turns into a != exit expression where one pointer is strided and (thanks to step #1) known to not overflow, and the other is loop invariant. The observation here is that, though the IV is strided by 4 in this case, that the IV *has* to become equal to the end value. It cannot "miss" the end value by stepping over it, because if it did, the strided IV expression would eventually wrap around. Handle this by turning A != B into "A-B != 0" where the A-B part is known to be NUW. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123131 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09teach SCEV analysis of PHI nodes that PHI recurences formedChris Lattner
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
2011-01-09reduce indentation. Print <nuw> and <nsw> when dumping SCEV AddRec'sChris Lattner
that have the bit set. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123104 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-07PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() andJay Foad
zextOrTrunc(), and APSInt methods extend(), extOrTrunc() and new method trunc(), to be const and to return a new value instead of modifying the object in place. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121120 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-01PR5207: Rename overloaded APInt methods set(), clear(), flip() toJay Foad
setAllBits(), setBit(unsigned), etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120564 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-20Simplify code. No change in functionality.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119908 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-19Silence warning about an uninitialized variable.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119800 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-18Factor code for testing whether replacing one value with anotherDuncan Sands
preserves LCSSA form out of ScalarEvolution and into the LoopInfo class. Use it to check that SimplifyInstruction simplifications are not breaking LCSSA form. Fixes PR8622. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119727 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-18Introduce memoization for ScalarEvolution dominates and properlyDominatesDan Gohman
queries, and SCEVExpander getRelevantLoop queries. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119595 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Factor out the code for purging a SCEV from all the various memoization maps.Dan Gohman
Some of these maps may merge in the future, but for now it's convenient to have a utility function for them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119587 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Merge the implementations of isLoopInvariant and hasComputableLoopEvolution, andDan Gohman
memoize the results. This improves compile time in code which highly complex expressions which get queried many times. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119584 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Make SCEV::getType() and SCEV::print non-virtual. Move SCEV::hasOperandDan Gohman
to ScalarEvolution. Delete SCEV::~SCEV. SCEV is no longer virtual. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119578 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Move SCEV::dominates and properlyDominates to ScalarEvolution.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119570 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Move SCEV::isLoopInvariant and hasComputableLoopEvolution to be memberDan Gohman
functions of ScalarEvolution, in preparation for memoization and other optimizations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119562 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Before replacing a phi node with a different value, itDuncan Sands
needs to be checked that this won't break LCSSA form. Change the existing checking method to a more direct one: rather than seeing if all predecessors belong to the loop, check that the replacing value is either not in any loop or is in a loop that contains the phi node. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119556 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Verify SCEVAddRecExpr's invariant in ScalarEvolution::getAddRecExprDan Gohman
instead of in SCEVAddRecExpr's constructor, in preparation for an upcoming change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119554 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Fix ScalarEvolution's range memoization to avoid using aDan Gohman
default ctor with ConstantRange. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119550 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Have ScalarEvolution use SimplifyInstruction rather than hasConstantValue.Duncan Sands
While there, add a note about an inefficiency I noticed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119458 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Memoize results from ScalarEvolution's getUnsignedRange and getSignedRange.Dan Gohman
This fixes some extreme compile times on unrolled sha512 code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119455 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-29Make ScalarEvolution::forgetLoop forget all contained loops too, becauseDan Gohman
they may have ValuesAtScopes map entries referencing their outer loops. This fixes a user-after-free reported in PR8471. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117698 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-19Get rid of static constructors for pass registration. Instead, every pass ↵Owen Anderson
exposes an initializeMyPassFunction(), which must be called in the pass's constructor. This function uses static dependency declarations to recursively initialize the pass's dependencies. Clients that only create passes through the createFooPass() APIs will require no changes. Clients that want to use the CommandLine options for passes will need to manually call the appropriate initialization functions in PassInitialization.h before parsing commandline arguments. I have tested this with all standard configurations of clang and llvm-gcc on Darwin. It is possible that there are problems with the static dependencies that will only be visible with non-standard options. If you encounter any crash in pass registration/creation, please send the testcase to me directly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116820 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-12Begin adding static dependence information to passes, which will allow us toOwen Anderson
perform initialization without static constructors AND without explicit initialization by the client. For the moment, passes are required to initialize both their (potential) dependencies and any passes they preserve. I hope to be able to relax the latter requirement in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116334 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-07Now with fewer extraneous semicolons!Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115996 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-04Don't add the operand count to SCEV uniquing data; FoldingSetNodeIDDan Gohman
already knows its own length, so this is redundant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115521 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-31Reapply r112432, now that the real problem is addressed.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112667 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-31Reapply r112433, now that the real problem is addressed.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112666 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-31Revert r110916. This patch is buggy because the code inside theDan Gohman
inner loop doesn't update all the variables in the outer loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112665 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-31Revert r112432. It appears to be exposing a problem in the emacs build.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112638 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-31Speculatively revert r112433.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112608 91177308-0d34-0410-b5e6-96231b3b80d8
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