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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
2010-11-19Remove threading of Xor over selects and phis, with an explanationDuncan Sands
of why such threading is pointless. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119798 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
2010-11-18Strip trailing whitespace.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119706 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-18Use llvm_unreachable for "impossible" situations.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119705 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-18Add support for PHI-translating sext, zext, and trunc instructions,Dan Gohman
enabling more PRE. PR8586. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119704 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
2010-11-17Move some those Xor simplifications which don't require creating newDuncan Sands
instructions out of InstCombine and into InstructionSimplify. While there, introduce an m_AllOnes pattern to simplify matching with integers and vectors with all bits equal to one. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119536 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Now that hasConstantValue has been made simpler, it may return theDuncan Sands
phi node itself if it occurs in an unreachable basic block. Protect against this. Hopefully this will fix some more buildbots. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119493 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Previously SimplifyInstruction could report that an instructionDuncan Sands
simplified to itself (this can only happen in unreachable blocks). Change it to return null instead. Hopefully this will fix some buildbot failures. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119490 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Fix a layering violation: hasConstantValue, which is part of the PHINodeDuncan Sands
class, uses DominatorTree which is an analysis. This change moves all of the tricky hasConstantValue logic to SimplifyInstruction, and replaces it with a very simple literal implementation. I already taught users of hasConstantValue that need tricky stuff to use SimplifyInstruction instead. I didn't update InlineFunction because the IR looks like it might be in a funky state at the point it calls hasConstantValue, which makes calling SimplifyInstruction dangerous since it can in theory do a lot of tricky reasoning. This may be a pessimization, for example in the case where all phi node operands are either undef or a fixed constant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119459 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
2010-11-16In which I discover the existence of loops. Threading an operationDuncan Sands
over a phi node by applying it to each operand may be wrong if the operation and the phi node are mutually interdependent (the testcase has a simple example of this). So only do this transform if it would be correct to perform the operation in each predecessor of the block containing the phi, i.e. if the other operands all dominate the phi. This should fix the FFMPEG snow.c regression reported by İsmail Dönmez. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119347 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-15Teach InstructionSimplify the trick of skipping incoming phiDuncan Sands
values that are equal to the phi itself. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119161 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-14If dom tree information is available, make it possible to passDuncan Sands
it to get better phi node simplification. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119055 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-14Teach InstructionSimplify about phi nodes. I chose to have it simplyDuncan Sands
offload the work to hasConstantValue rather than do something more complicated (such handling mutually recursive phis) because (1) it is not clear it is worth it; and (2) if it is worth it, maybe such logic would be better placed in hasConstantValue. Adjust some GVN tests which are now cleaned up much further (eg: all phi nodes are removed). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119043 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-14Boost the power of phi node constant folding slightly: if allDuncan Sands
operands are the phi node itself or undef, then return undef. This logic already existed at a higher level so in practice it shouldn't make the slightest difference. Note that this code could be replaced by a call to PN->hasConstantValue(). However since we bail out the moment we see a non-constant operand, it is more efficient to have a specialized version of that logic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119041 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-14Strip trailing whitespace.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119038 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-13Fix typo pointed out by Trevor Harmon.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119001 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-12Re-disable TBAA for now; it broke MultiSource/Applications/JM/lencod,Dan Gohman
at least. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118890 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-12Enable TBAA.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118884 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-11Add helper functions for computing the Location of load, store,Dan Gohman
and vaarg instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118845 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-11Don't forget the TBAA info, if available.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118842 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-11Avoid calling alias on non-pointer values.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118822 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-11It's not necessary to clear out the Size and TBAATag at each ofDan Gohman
these points. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118752 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-11Set NonLocalDepInfo's Size field to UnknownSize when invalidatingDan Gohman
it, so that it doesn't appear to be a known size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118748 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10When clearing a non-local pointer dependency cache entry, clearDan Gohman
the reverse map too. This fixes seflhost build errors. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118729 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10Take care of special characters while creating named MDNode name to hold ↵Devang Patel
function specific local variable's info. This fixes radar 8653152. I am checking in testcase as a separate check-in. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118726 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10Factor out the code for computing an AliasAnalysis::LocationDan Gohman
for a given instruction into a helper function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118723 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10Fully invalidate cached results when a prior query's size orDan Gohman
type is insufficient for, or incompatible with, the current query. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118721 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10Reduce the maximum recursion depth, 5 seems pointlessly too much.Duncan Sands
Probably it should just be 1, but compromise with 3. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118718 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10Enhance GVN to do more precise alias queries for non-local memoryDan Gohman
references. For example, this allows gvn to eliminate the load in this example: void foo(int n, int* p, int *q) { p[0] = 0; p[1] = 1; if (n) { *q = p[0]; } } git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118714 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10Teach InstructionSimplify how to look through PHI nodes. Since PHIDuncan Sands
nodes can be used in loops, this could result in infinite looping if there is no recursion limit, so add such a limit. It is also used for the SelectInst case because in theory there could be an infinite loop there too if the basic block is unreachable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118694 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10Add a doesAccessArgPointees helper function, and update code to useDan Gohman
it, and to be consistent. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118692 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10Simplify binary operations where one operand is a select instruction.Duncan Sands
The simplifications performed here never create new instructions, they only return existing instructions (or a constant), and so are always a win. In theory they should transform (for example) %z = and i32 %x, %y %s = select i1 %cond, i32 %y, i32 %z %r = and i32 %x, %s into %r = and i32 %x, y but in practice they get into a fight with instcombine, and lose. Unfortunately instcombine does a poor job in this case. Nonetheless I'm committing this transform to make it easier to discuss what to do to make peace with instcombine. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118679 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10Make ModRefBehavior a lattice. Use this to clean up AliasAnalysisDan Gohman
chaining and simplify FunctionAttrs' GetModRefBehavior logic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118660 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-09VAArg doesn't capture its operand.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118623 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-09Teach AliasAnalysis about AccessesArgumentsReadonly.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118621 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-09Teach LICM and AliasSetTracker about AccessesArgumentsReadonly.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118618 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-09Factorize code, no functionality change.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118516 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-08Re-introduce the MaxLookup limit to BasicAliasAnalysis'Dan Gohman
pointsToConstantMemory code to guard against possible compile time slowdowns. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118440 91177308-0d34-0410-b5e6-96231b3b80d8
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