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2008-12-16switch some std::set/std::map to SmallPtrSet/DenseMap.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61081 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-15enhance heap-sra to apply to fixed sized array allocations, not justChris Lattner
variable sized array allocations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61051 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-15Use stripPointerCasts.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61047 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-15minor tweaks for formatting, allow bitcast in ↵Chris Lattner
ValueIsOnlyUsedLocallyOrStoredToOneGlobal. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61046 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-15refactor some code into a new TryToOptimizeStoreOfMallocToGlobal function.Chris Lattner
Use GetElementPtrInst::hasAllZeroIndices where possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61045 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-15Enable Load PRE. This teaches GVN to push partially redundant loads up theChris Lattner
CFG when there is exactly one predecessor where the load is not available. This is designed to not increase code size but still eliminate partially redundant loads. This fires 1765 times on 403.gcc even though it doesn't do critical edge splitting yet (the most common reason for it to fail). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61027 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-15Ifdef out some code that I didn't mean to enable by default yet.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61024 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-15make GVN try to rename inputs to the resultant replaced values, whichChris Lattner
cleans up the generated code a bit. This should have the added benefit of not randomly renaming functions/globals like my previous patch did. :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61023 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-15Add support for slow-path GVN with full phi construction for scalars. This ↵Owen Anderson
is disabled for now, as it actually pessimizes code in the abscence of phi translation for load elimination. This slow down GVN a bit, by about 2% on 403.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61021 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-14eliminate warning when asserts disabled.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61012 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-14Generalize GVN's phi construciton routine to work for things other than loads.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61009 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-13Temporarily revert r60973. It's inexplicably causing a failure when ↵Bill Wendling
self-hosting LLVM: llvm[2]: Linking Release executable opt (without symbols) ... Undefined symbols: "llvm::APFloat::IEEEsingle", referenced from: __ZN4llvm7APFloat10IEEEsingleE$non_lazy_ptr in libLLVMCore.a(Constants.o) __ZN4llvm7APFloat10IEEEsingleE$non_lazy_ptr in libLLVMCore.a(AsmWriter.o) __ZN4llvm7APFloat10IEEEsingleE$non_lazy_ptr in libLLVMCore.a(ConstantFold.o) "llvm::APFloat::IEEEdouble", referenced from: __ZN4llvm7APFloat10IEEEdoubleE$non_lazy_ptr in libLLVMCore.a(Constants.o) __ZN4llvm7APFloat10IEEEdoubleE$non_lazy_ptr in libLLVMCore.a(AsmWriter.o) __ZN4llvm7APFloat10IEEEdoubleE$non_lazy_ptr in libLLVMCore.a(ConstantFold.o) ld: symbol(s) not found This is in release mode. To replicate, compile llvm and llvm-gcc in optimized mode. Then build llvm, in optimized mode, with the newly created compiler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60977 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-13make RLE preserve the name of the load that it replaces. This is justChris Lattner
a pretification of the IR. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60973 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-13Fix spelling.Misha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60971 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-09Teach GVN to invalidate some memdep information when it does an RAUWChris Lattner
of a pointer. This allows is to catch more equivalencies. For example, the type_lists_compatible_p function used to require two iterations of the gvn pass (!) to delete its 18 redundant loads because the first pass would CSE all the addressing computation cruft, which would unblock the second memdep/gvn passes from recognizing them. This change allows memdep/gvn to catch all 18 when run just once on the function (as is typical :) instead of just 3. On all of 403.gcc, this bumps up the # reundandancies found from: 63 gvn - Number of instructions PRE'd 153991 gvn - Number of instructions deleted 50069 gvn - Number of loads deleted to: 63 gvn - Number of instructions PRE'd 154137 gvn - Number of instructions deleted 50185 gvn - Number of loads deleted +120 loads deleted isn't bad. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60799 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-09rename getNonLocalDependency -> getNonLocalCallDependency, and removeChris Lattner
pointer stuff from it, simplifying the code a bit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60783 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-09Switch GVN::processNonLocalLoad to using the new Chris Lattner
MemDep::getNonLocalPointerDependency method. There are some open issues with this (missed optimizations) and plenty of future work, but this does allow GVN to eliminate *slightly* more loads (49246 vs 49033). Switching over now allows simplification of the other code path in memdep. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60780 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-09random cleanups, no functionality change.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60779 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-09Fix a really subtle off-by-one bug that Duncan noticed with valgrindChris Lattner
on test/CodeGen/Generic/2007-06-06-CriticalEdgeLandingPad. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60739 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-08remove DebugIterations option. Despite the accusations, Chris Lattner
jump threading has been shown to only expose problems not have bugs itself. I'm sure it's completely bug free! ;-) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60725 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-08Fix spelling. Devang Patel
Thanks Duncan! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60702 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-08Undo previous patch. Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60701 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-07fix a bug I introduced in simplifycfg handling single entry phi Chris Lattner
nodes. FoldSingleEntryPHINodes deletes the PHI, so there is no need to delete it afterward. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60653 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-07don't bother touching volatile stores, they will just return clobber onChris Lattner
everything interesting anyway. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60640 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-06Reimplement the inner loop of DSE. It now uniformly uses getDependence(),Chris Lattner
doesn't do its own local caching, and is slightly more aggressive about free/store dse (see testcase). This eliminates the last external client of MemDep::getDependenceFrom(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60619 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-05Make LoopStrengthReduce smarter about hoisting things out ofDale Johannesen
loops when they can be subsumed into addressing modes. Change X86 addressing mode check to realize that some PIC references need an extra register. (I believe this is correct for Linux, if not, I'm sure someone will tell me.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60608 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-05Make a few major changes to memdep and its clients:Chris Lattner
1. Merge the 'None' result into 'Normal', making loads and stores return their dependencies on allocations as Normal. 2. Split the 'Normal' result into 'Clobber' and 'Def' to distinguish between the cases when memdep knows the value is produced from when we just know if may be changed. 3. Move some of the logic for determining whether readonly calls are CSEs into memdep instead of it being in GVN. This still leaves verification that the arguments are hte same to GVN to let it know about value equivalences in different contexts. 4. Change memdep's call/call dependency analysis to use getModRefInfo(CallSite,CallSite) instead of doing something very weak. This only really matters for things like DSA, but someday maybe we'll have some other decent context sensitive analyses :) 5. This reimplements the guts of memdep to handle the new results. 6. This simplifies GVN significantly: a) readonly call CSE is slightly simpler b) I eliminated the "getDependencyFrom" chaining for load elimination and load CSE doesn't have to worry about volatile (they are always clobbers) anymore. c) GVN no longer does any 'lastLoad' caching, leaving it to memdep. 7. The logic in DSE is simplified a bit and sped up. A potentially unsafe case was eliminated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60607 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-05Revert invalid r60393. It causes llvm-gcc bootstrap fails in release builds.Anton Korobeynikov
See PR3160 for details git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60604 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-05Fix test/Transforms/GVN/pre-load.llChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60594 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-05Make IsValueFullyAvailableInBlock safe.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60588 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-04Rewrite code that 1) filters loops and 2) calculates new loop bounds.Devang Patel
This fixes many bugs. I will add more test cases in a separate check-in. Some day, the code that manipulates CFG and updates dom. info could use refactoring help. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60554 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-04Start simplifying a switch that has a successor that is a switch.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60534 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-04add a debugging option to help track down j-t problems.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60514 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-03Remove an unused field.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60508 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-03Fix a misspelled function name.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60506 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-03Factor some code into a new FoldSingleEntryPHINodes method.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60501 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-03Fix a really wrong comment.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60494 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-03Teach jump threading some more simple tricks:Chris Lattner
1) have it fold "br undef", which does occur with surprising frequency as jump threading iterates. 2) teach j-t to delete dead blocks. This removes the successor edges, reducing the in-edges of other blocks, allowing recursive simplification. 3) Fold things like: br COND, BBX, BBY BBX: br COND, BBZ, BBW which also happens because jump threading iterates. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60470 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-03third time is the charm.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60469 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-03fix assertion.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60468 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-03Rename DeleteBlockIfDead to DeleteDeadBlock and make it Chris Lattner
unconditionally delete the block. All likely clients will do the checking anyway. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60464 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-03Factor some code out of SimplifyCFG, forming a new Chris Lattner
DeleteBlockIfDead method. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60463 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-02Minor rewrite per review feedback.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60442 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-02Make the code do what the comment says it does.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60431 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-02Implement PRE of loads in the GVN pass with a pretty cheap and Chris Lattner
straight-forward implementation. This does not require any extra alias analysis queries beyond what we already do for non-local loads. Some programs really really like load PRE. For example, SPASS triggers this ~1000 times, ~300 times in 255.vortex, and ~1500 times on 403.gcc. The biggest limitation to the implementation is that it does not split critical edges. This is a huge killer on many programs and should be addressed after the initial patch is enabled by default. The implementation of this should incidentally speed up rejection of non-local loads because it avoids creating the repl densemap in cases when it won't be used for fully redundant loads. This is currently disabled by default. Before I turn this on, I need to fix a couple of miscompilations in the testsuite, look at compile time performance numbers, and look at perf impact. This is pretty close to ready though. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60408 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-02Remove some errors that crept in. No functionality change.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60403 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-02Merge two if-statements into one.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60402 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-02More styalistic changes. No functionality change.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60401 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-02- Remove the buggy -X/C -> X/-C transform. This isn't valid when X isn't aBill Wendling
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
2008-12-02Improve comment.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60398 91177308-0d34-0410-b5e6-96231b3b80d8
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