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2011-01-11Turn on memdep's verifyRemoved() in an attempt to smoke out the cause of our ↵Jakob Stoklund Olesen
gcc bootstrap miscompare. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123207 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-11Teach constant folding to perform conversions from constant floatingChandler Carruth
point values to their integer representation through the SSE intrinsic calls. This is the last part of a README.txt entry for which I have real world examples. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123206 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-10Cleanup some of the constant folding code to consistently test intrinsicChandler Carruth
IDs when available rather than using a mixture of IDs and textual name comparisons. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123165 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
2011-01-06use isNullValue() to simplify code, add an assert.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122977 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-06implement constant folding support for an exotic constant expr:Chris Lattner
ret i64 ptrtoint (i8* getelementptr ([1000 x i8]* @X, i64 1, i64 sub (i64 0, i64 ptrtoint ([1000 x i8]* @X to i64))) to i64) to "ret i64 1000". This allows us to correctly compute the trip count on a loop in PR8883, which occurs with std::fill on a char array. This allows us to transform it into a memset with a constant size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122950 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-05Reorder, rename, and document some members to make this easier to follow.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122929 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-05When computing the value on an edge, in certain cases LVI would fail to ↵Owen Anderson
compute the value range in the predecessor block, leading to an incorrect conclusion for the edge value. Found by inspection. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122908 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-05Re-convert several of LazyValueInfo's internal maps to Dense{Map|Set}, and ↵Owen Anderson
fix the issue in hasBlockValue() that was causing iterator invalidations. Many thanks to Dimitry Andric for tracking down those invalidations! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122906 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-04fix an off-by-one bug that caused a crash analyzingChris Lattner
ashr's with huge shift amounts, PR8896 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122814 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03Use the new addEscapingValue callback to update GlobalsModRef when GVN adds ↵Owen Anderson
PHIs of GEPs. For the moment, have GlobalsModRef handle this conservatively by simply removing the value from its maps. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122787 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03Stub out a new updating interface to AliasAnalysis, allowing stateful ↵Owen Anderson
analyses to be informed when a pointer value has potentially become escaping. Implementations can choose to either fall back to conservative responses for that value, or may recompute their analysis to accomodate the change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122777 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03fix rdar://8813415 - a miscompilation of 164.gzip that loop-idiomChris Lattner
exposed. It turns out to be a latent bug in basicaa, scary. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122772 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03Add spliceFunction to the CallGraph interface. This allows users to efficientlyNick Lewycky
update a callGraph when performing the common operation of splicing the body to a new function and updating all callers (such as via RAUW). No users yet, though this is intended for DeadArgumentElimination as part of PR8887. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122728 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02split dom frontier handling stuff out to its own DominanceFrontier header,Chris Lattner
so that Dominators.h is *just* domtree. Also prune #includes a bit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122714 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-01Revert commit 122654 at the request of Chris, who reckons that instsimplifyDuncan Sands
is the wrong hammer for this nail, and is probably right. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122661 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-01Fix a README item by having InstructionSimplify do a mild form of valueDuncan Sands
numbering, in which it considers (for example) "%a = add i32 %x, %y" and "%b = add i32 %x, %y" to be equal because the operands are equal and the result of the instructions only depends on the values of the operands. This has almost no effect (it removes 4 instructions from gcc-as-one-file), and perhaps slows down compilation: I measured a 0.4% slowdown on the large gcc-as-one-file testcase, but it wasn't statistically significant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122654 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-28Cast away "comparison between signed and unsigned integer" warnings.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122598 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-26move isBytewiseValue out to ValueTracking.h/cppChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122565 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-23Change all self assignments X=X to (void)X, so that we can turn on aJeffrey Yasskin
new gcc warning that complains on self-assignments and self-initializations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122458 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-22When determining whether the new instruction was already present inDuncan Sands
the original instruction, half the cases were missed (making it not wrong but suboptimal). Also correct a typo (A <-> B) in the second chunk. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122414 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-22Add some statistics, good for understanding how much more powerfulDuncan Sands
instcombine is compared to instsimplify. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122397 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-21While I don't think any later transforms can fire, it seems cleaner toDuncan Sands
not assume this (for example in case more transforms get added below it). Suggested by Frits van Bommel. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122332 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-21Fix inverted condition noticed by Frits van Bommel.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122331 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-21Pull a few more simplifications out of instcombine (there are stillDuncan Sands
plenty left though!), in particular for multiplication. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122330 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-21Teach InstructionSimplify about distributive laws. These transforms fireDuncan Sands
quite often, but don't make much difference in practice presumably because instcombine also knows them and more. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122328 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-21Move checking of the recursion limit into the various Thread methods.Duncan Sands
No functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122327 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-21Add generic simplification of associative operations, generalizingDuncan Sands
a couple of existing transforms. This fires surprisingly often, for example when compiling gcc "(X+(-1))+1->X" fires quite a lot as well as various "and" simplifications (usually with a phi node operand). Most of the time this doesn't make a real difference since the same thing would have been done elsewhere anyway, eg: by instcombine, but there are a few places where this results in simplifications that we were not doing before. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122326 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-20Speculatively revert the use of DenseMap in LazyValueInfo, which may be ↵Owen Anderson
causing Linux self-host failures. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122291 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-20Attempt to appease the DragonEgg buildbots.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122288 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-20Convert one of LVI's primary maps to a DenseMap, now that we know are more ↵Owen Anderson
assured of iterator stability. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122273 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-20More LVI cleanups, including trying to simplify the process of maintaining ↵Owen Anderson
the OverDefinedCache. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122256 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-20Reuse the reference into the LVI cache throughout the solver subsystem. ↵Owen Anderson
This is much easier to verify as being safe thanks its recent de-recursivization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122254 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-20Have SimplifyBinOp dispatch Xor, Add and Sub to the corresponding methodsDuncan Sands
(they had just been forgotten before). Adding Xor causes "main" in the existing testcase 2010-11-01-lshr-mask.ll to be hugely more simplified. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122245 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-18Make LazyValueInfo non-recursive.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122120 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-17Add vector versions of some existing scalar transforms to aid codegen in ↵Nate Begeman
matching psign & pblend operations to the IR produced by clang/gcc for their C idioms. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122105 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-16Update a comment.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121946 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-16Make memcpyopt TBAA-aware.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121944 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Enable TBAA by default.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121923 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Reapply r121886, and also update DecomposeGEPExpression to keepDan Gohman
it in sync. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121895 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Revert r121886. DecomposeGEPExpression needs to be keptDan Gohman
in sync. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121892 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Strengthen GetUnderlyingObject using InstructionSimplify.Dan Gohman
While LLVM's main design is that analysis code shouldn't go out of its way to understand code which hasn't been InstCombined, analysis utility routines like this can find themselves being called in the middle of transform passes when instcombine hasn't had a chance to run. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121886 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Move Value::getUnderlyingObject to be a standaloneDan Gohman
function so that it can live in Analysis instead of VMCore. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121885 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-15Clean up some of LVI:Nick Lewycky
* mergeIn now uses constant folding for constants that are provably not-equal. * sink some sanity checks from the get*() methods into the mark*() methods, to ensure that we never have a constant/notconstant ConstantInt * some textual cleanups, whitespace changes, removing "else" after return, that sort of thing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121877 91177308-0d34-0410-b5e6-96231b3b80d8
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