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* Fix for PR2164: allow transforming arbitrary-width unsigned divides intoEli Friedman2008-11-301-95/+65
| | | | | | | | | | | multiplies. Some more cleverness would be nice, though. It would be nice if we could do this transformation on illegal types. Also, we would prefer a narrower constant when possible so that we can use a narrower multiply, which can be cheaper. llvm-svn: 60283
* Don't make TwoToExp signed by default.Bill Wendling2008-11-301-2/+1
| | | | llvm-svn: 60279
* From Hacker's Delight:Bill Wendling2008-11-301-8/+10
| | | | | | | | | | "For signed integers, the determination of overflow of x*y is not so simple. If x and y have the same sign, then overflow occurs iff xy > 2**31 - 1. If they have opposite signs, then overflow occurs iff xy < -2**31." In this case, x == -1. llvm-svn: 60278
* APIntify a test which is potentially unsafe otherwise, and fix the Eli Friedman2008-11-301-3/+10
| | | | | | | | | nearby FIXME. I'm not sure what the right way to fix the Cell test was; if the approach I used isn't okay, please let me know. llvm-svn: 60277
* Instcombine was illegally transforming -X/C into X/-C when either X or CBill Wendling2008-11-301-3/+20
| | | | | | | | overflowed on negation. This commit checks to make sure that neithe C nor X overflows. This requires that the RHS of X (a subtract instruction) be a constant integer. llvm-svn: 60275
* Two changes: Make getDependency remove QueryInst for a dirty record'sChris Lattner2008-11-301-18/+26
| | | | | | | | | | | ReverseLocalDeps when we update it. This fixes a regression test failure from my last commit. Second, for each non-local cached information structure, keep a bit that indicates whether it is dirty or not. This saves us a scan over the whole thing in the common case when it isn't dirty. llvm-svn: 60274
* introduce a typedef, no functionality change.Chris Lattner2008-11-301-16/+15
| | | | llvm-svn: 60272
* Change NonLocalDeps to be a densemap of pointers to densemapChris Lattner2008-11-301-30/+52
| | | | | | | | | | | | instead of containing them by value. This increases the density (!) of NonLocalDeps as well as making the reallocation case faster. This speeds up gvn on 403.gcc by 2% and makes room for future improvements. I'm not super thrilled with having to explicitly manage the new/delete of the map, but it is necesary for the next change. llvm-svn: 60271
* calls never depend on allocations.Chris Lattner2008-11-301-12/+5
| | | | llvm-svn: 60268
* Fix a fixme by making memdep's handling of allocations more logical.Chris Lattner2008-11-302-35/+22
| | | | | | | | If we see that a load depends on the allocation of its memory with no intervening stores, we now return a 'None' depedency instead of "Normal". This tweaks GVN to do its optimization with the new result. llvm-svn: 60267
* implement a fixme by introducing a new getDependencyFromInternalChris Lattner2008-11-301-24/+19
| | | | | | | method that returns its result as a DepResultTy instead of as a MemDepResult. This reduces conversion back and forth. llvm-svn: 60266
* Move the getNonLocalDependency method to a more logical place inChris Lattner2008-11-301-90/+89
| | | | | | the file, no functionality change. llvm-svn: 60265
* REmove an old fixme, resolve another fixme by adding liberalChris Lattner2008-11-301-2/+0
| | | | | | comments about what this class does. llvm-svn: 60264
* remove a bit of incorrect code that tried to be tricky about speeding up Chris Lattner2008-11-301-49/+24
| | | | | | | | | | | | | | | | | | | | | | | | | dependencies. The basic situation was this: consider if we had: store1 ... store2 ... store3 Where memdep thinks that store3 depends on store2 and store2 depends on store1. The problem happens when we delete store2: The code in question was updating dep info for store3 to be store1. This is a spiffy optimization, but is not safe at all, because aliasing isn't transitive. This bug isn't exposed today with DSE because DSE will only zap store2 if it is identifical to store 3, and in this case, it is safe to update it to depend on store1. However, memcpyopt is not so fortunate, which is presumably why the "dropInstruction" code used to exist. Since this doesn't actually provide a speedup in practice, just rip the code out. llvm-svn: 60263
* Eliminate the dropInstruction method, which is not needed any more.Chris Lattner2008-11-292-82/+35
| | | | | | Fix a subtle iterator invalidation bug I introduced in the last commit. llvm-svn: 60258
* implement some fixme's: when deleting an instruction withChris Lattner2008-11-291-14/+62
| | | | | | | | | | | | | an entry in the nonlocal deps map, don't reset entries referencing that instruction to [dirty, null], instead, set them to [dirty,next] where next is the instruction after the deleted one. Use this information in the non-local deps code to avoid rescanning entire blocks. This speeds up GVN slightly by avoiding pointless work. On 403.gcc this makes GVN 1.5% faster. llvm-svn: 60256
* Change MemDep::getNonLocalDependency to return its results asChris Lattner2008-11-292-12/+11
| | | | | | | a smallvector instead of a DenseMap. This speeds up GVN by 5% on 403.gcc. llvm-svn: 60255
* move MemoryDependenceAnalysis::verifyRemoved to the end of the file,Chris Lattner2008-11-291-32/+32
| | | | | | no functionality/code change. llvm-svn: 60254
* reimplement getNonLocalDependency with a simpler worklistChris Lattner2008-11-292-140/+94
| | | | | | | formulation that is faster and doesn't require nonLazyHelper. Much less code. llvm-svn: 60253
* Fix a thinko that manifested as a crash on clamav last night.Chris Lattner2008-11-291-2/+2
| | | | llvm-svn: 60251
* rename some maps.Chris Lattner2008-11-291-35/+35
| | | | llvm-svn: 60242
* rename some variables.Chris Lattner2008-11-291-21/+21
| | | | llvm-svn: 60241
* eliminate a bunch of code in favor of using AliasAnalysis::getModRefInfo.Chris Lattner2008-11-291-47/+45
| | | | | | | Put a some code back to handle buggy behavior that GVN expects: it wants loads to depend on each other, and accesses to depend on their allocations. llvm-svn: 60240
* simplify some code and rename some variables. Reduce nesting.Chris Lattner2008-11-291-64/+64
| | | | | | | Use getTypeStoreSize instead of ABITypeSize for in-memory size in a couple places. llvm-svn: 60238
* Split getDependency into getDependency and getDependencyFrom, the Chris Lattner2008-11-293-126/+82
| | | | | | | former does caching, the later doesn't. This dramatically simplifies the logic in getDependency and getDependencyFrom. llvm-svn: 60234
* Temporarily revert r60195. It's causing an optimized bootstrap of llvm-gcc ↵Bill Wendling2008-11-291-20/+21
| | | | | | to fail. llvm-svn: 60233
* Now that DepType is private, we can start cleaning up some of its uses:Chris Lattner2008-11-291-73/+61
| | | | | | | | | | | | | | Document the Dirty value more precisely, use it for the uninitialized DepResultTy value. Change reverse mappings to be from an instruction* instead of DepResultTy, and stop tracking other forms. This makes it more clear that we only care about the instruction cases. Eliminate a DepResultTy,bool pair by using Dirty in the local case as well, shrinking the map and simplifying the code. This speeds up GVN by ~3% on 403.gcc. llvm-svn: 60232
* Introduce and use a new MemDepResult class to hold the results of a memdepChris Lattner2008-11-294-95/+84
| | | | | | | | | | | query. This makes it crystal clear what cases can escape from MemDep that the clients have to handle. This also gives the clients a nice simplified interface to it that is easy to poke at. This patch also makes DepResultTy and MemoryDependenceAnalysis::DepType private, yay. llvm-svn: 60231
* Reimplement the internal abstraction used by MemDep in termsChris Lattner2008-11-294-166/+166
| | | | | | | | | | | | | | | of a pointer/int pair instead of a manually bitmangled pointer. This forces clients to think a little more about checking the appropriate pieces and will be useful for internal implementation improvements later. I'm not particularly happy with this. After going through this I don't think that the clients of memdep should be exposed to the internal type at all. I'll fix this in a subsequent commit. This has no functionality change. llvm-svn: 60230
* Fix PR3141 by ensuring that MemoryDependenceAnalysis::removeInstructionChris Lattner2008-11-281-12/+28
| | | | | | | properly updates the reverse dependency map when it installs updated dependencies for instructions that depend on the removed instruction. llvm-svn: 60222
* don't revisit instructions off the beginning of the block.Chris Lattner2008-11-281-2/+4
| | | | llvm-svn: 60221
* more cleanups for MemoryDependenceAnalysis::removeInstruction,Chris Lattner2008-11-281-38/+42
| | | | | | no functionality change. llvm-svn: 60219
* random cleanups, no functionality change.Chris Lattner2008-11-281-29/+28
| | | | llvm-svn: 60218
* Run verifyRemoved from removeInstruction when -debug is specified.Chris Lattner2008-11-281-10/+14
| | | | | | This shows the root problem behind PR3141. llvm-svn: 60216
* rename "ping" to "verifyRemoved". I don't know why 'ping' what chosen,Chris Lattner2008-11-281-12/+13
| | | | | | | | but it doesn't make any sense at all. Also make the method const, private, and fit in 80 cols while we're at it. llvm-svn: 60215
* simplify some code, remove escaped newline.Chris Lattner2008-11-281-22/+28
| | | | llvm-svn: 60213
* remove mysterious escaped newlines.Chris Lattner2008-11-281-5/+5
| | | | llvm-svn: 60211
* don't call MergeBasicBlockIntoOnlyPred on a block whose onlyChris Lattner2008-11-282-11/+14
| | | | | | | predecessor is itself. This doesn't make sense, and this is a dead infinite loop anyway. llvm-svn: 60210
* Add include files needed when building withDuncan Sands2008-11-282-0/+2
| | | | | | gcc 4.4 (due to use of sprintf). llvm-svn: 60209
* Fix build with gcc-4.4: it doesn't like PICStyleDuncan Sands2008-11-283-15/+15
| | | | | | being both a namespace and a variable name. llvm-svn: 60208
* rewrite RecursivelyDeleteTriviallyDeadInstructions to use a more efficientChris Lattner2008-11-281-16/+26
| | | | | | formulation that doesn't require set lookups or scanning a set. llvm-svn: 60203
* remove some weirdness that came from the LSR code that hasChris Lattner2008-11-281-8/+1
| | | | | | | nothing to do with dead instruction elimination. No tests in dejagnu depend on this, so I don't know what it was needed for. llvm-svn: 60202
* rewrite a big chunk of how DSE does recursive dead operand Chris Lattner2008-11-281-181/+105
| | | | | | | elimination to use more modern infrastructure. Also do a bunch of small cleanups. llvm-svn: 60201
* delete ErasePossiblyDeadInstructionTree, replacing uses of it withChris Lattner2008-11-271-41/+9
| | | | | | RecursivelyDeleteTriviallyDeadInstructions. llvm-svn: 60196
* Simplify LoopStrengthReduce::DeleteTriviallyDeadInstructions byChris Lattner2008-11-271-21/+20
| | | | | | | making it use RecursivelyDeleteTriviallyDeadInstructions to do the heavy lifting. llvm-svn: 60195
* enhance RecursivelyDeleteTriviallyDeadInstructions to makeChris Lattner2008-11-271-0/+9
| | | | | | PHIs dead if they are single-value. llvm-svn: 60194
* Enhance RecursivelyDeleteTriviallyDeadInstructions to optionallyChris Lattner2008-11-271-7/+15
| | | | | | return a list of deleted instructions. llvm-svn: 60193
* use continue to reduce indentationChris Lattner2008-11-271-18/+19
| | | | llvm-svn: 60192
* remove doConstantPropagation and dceInstruction, they are justChris Lattner2008-11-272-51/+26
| | | | | | | | | | wrappers around the interesting code and use an obscure iterator abstraction that dates back many many years. Move EraseDeadInstructions to Transforms/Utils and name it RecursivelyDeleteTriviallyDeadInstructions. llvm-svn: 60191
* simplify code.Chris Lattner2008-11-271-4/+12
| | | | llvm-svn: 60190
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