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2007-04-09Improve some _slow_ behavior introduced in my patches the last few days.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35839 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-09Cleanup some from my DomSet-removal changes. Add a newOwen Anderson
isReachableFromEntry test to ETForest to factor a common test out of code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35786 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-08Remove DominatorSet usage from LoopSimplify. Patch from Owen Anderson.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35757 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-07Add DomSet back, and revert the changes to LoopSimplify. Apparently theOwen Anderson
ETForest updating mechanisms don't work as I thought they did. These changes will be reapplied once the issue is worked out. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35741 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-07Completely purge DomSet from LoopSimplify. This is part of theOwen Anderson
continuing work on PR1171. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35730 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-07Expunge a bunch of uses of DomSet from LoopSimplify. Many more remain.Owen Anderson
This is the beginning of work for PR1171. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35720 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-20LoopSimplify::FindPHIToPartitionLoops()Devang Patel
Use ETForest instead of DominatorSet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35221 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-19switch more statistics over to STATISTIC, eliminating static ctors. Also,Chris Lattner
delete some dead ones. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32694 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-06Detemplatize the Statistic class. The only type it is instantiated withChris Lattner
is 'unsigned'. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32279 91177308-0d34-0410-b5e6-96231b3b80d8
2006-11-02For PR786:Reid Spencer
Turn on -Wunused and -Wno-unused-parameter. Clean up most of the resulting fall out by removing unused variables. Remaining warnings have to do with unused functions (I didn't want to delete code without review) and unused variables in generated code. Maintainers should clean up the remaining issues when they see them. All changes pass DejaGnu tests and Olden. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31380 91177308-0d34-0410-b5e6-96231b3b80d8
2006-09-23Be far more careful when splitting a loop header, either to form a preheaderChris Lattner
or when splitting loops with a common header into multiple loops. In particular the old code would always insert the preheader before the old loop header. This is disasterous in cases where the loop hasn't been rotated. For example, it can produce code like: .. outside the loop... jmp LBB1_2 #bb13.outer LBB1_1: #bb1 movsd 8(%esp,%esi,8), %xmm1 mulsd (%edi), %xmm1 addsd %xmm0, %xmm1 addl $24, %edi incl %esi jmp LBB1_3 #bb13 LBB1_2: #bb13.outer leal (%edx,%eax,8), %edi pxor %xmm1, %xmm1 xorl %esi, %esi LBB1_3: #bb13 movapd %xmm1, %xmm0 cmpl $4, %esi jl LBB1_1 #bb1 Note that the loop body is actually LBB1_1 + LBB1_3, which means that the loop now contains an uncond branch WITHIN it to jump around the inserted loop header (LBB1_2). Doh. This patch changes the preheader insertion code to insert it in the right spot, producing this code: ... outside the loop, fall into the header ... LBB1_1: #bb13.outer leal (%edx,%eax,8), %esi pxor %xmm0, %xmm0 xorl %edi, %edi jmp LBB1_3 #bb13 LBB1_2: #bb1 movsd 8(%esp,%edi,8), %xmm0 mulsd (%esi), %xmm0 addsd %xmm1, %xmm0 addl $24, %esi incl %edi LBB1_3: #bb13 movapd %xmm0, %xmm1 cmpl $4, %edi jl LBB1_2 #bb1 Totally crazy, no branch in the loop! :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30587 91177308-0d34-0410-b5e6-96231b3b80d8
2006-09-23Teach UpdateDomInfoForRevectoredPreds to handle revectored preds that are notChris Lattner
reachable, making it general purpose enough for use by InsertPreheaderForLoop. Eliminate custom dominfo updating code in InsertPreheaderForLoop, using UpdateDomInfoForRevectoredPreds instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30586 91177308-0d34-0410-b5e6-96231b3b80d8
2006-08-27eliminate RegisterOpt. It does the same thing as RegisterPass.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29925 91177308-0d34-0410-b5e6-96231b3b80d8
2006-08-27s|llvm/Support/Visibility.h|llvm/Support/Compiler.h|Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29911 91177308-0d34-0410-b5e6-96231b3b80d8
2006-08-12Don't attempt to split subloops out of a loop with a huge number of backedges.Chris Lattner
Not only will this take huge amounts of compile time, the resultant loop nests won't be useful for optimization. This reduces loopsimplify time on Transforms/LoopSimplify/2006-08-11-LoopSimplifyLongTime.ll from ~32s to ~0.4s with a debug build of llvm on a 2.7Ghz G5. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29647 91177308-0d34-0410-b5e6-96231b3b80d8
2006-08-12Reimplement the loopsimplify code which deletes edges from unreachableChris Lattner
blocks that target loop blocks. Before, the code was run once per loop, and depended on the number of predecessors each block in the loop had. Unfortunately, scanning preds can be really slow when huge numbers of phis exist or when phis with huge numbers of inputs exist. Now, the code is run once per function and scans successors instead of preds, which is far faster. In addition, the new code is simpler and is goto free, woo. This change speeds up a nasty testcase Duraid provided me from taking hours to taking ~72s with a debug build. The functionality this implements is already tested in the testsuite as Transforms/CodeExtractor/2004-03-13-LoopExtractorCrash.ll. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29644 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-28Use hidden visibility to make symbols in an anonymous namespace getChris Lattner
dropped. This shrinks libllvmgcc.dylib another 67K git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28975 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-14Canonicalize inner loops before outer loops. Inner loop canonicalizationChris Lattner
can provide work for the outer loop to canonicalize. This fixes a case that breaks unswitching. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26189 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-14When splitting exit edges to canonicalize loops, make sure to put the newChris Lattner
block in the appropriate loop nest. Third time is the charm, right? git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26187 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-12Revert my last patch. It too breaks stuffChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26128 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-11Fix for my previously reverted patchChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26126 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-11revert my previous change, it exposed other problems.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26121 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-11Make this check stricter. Disallow loop exit blocks from being shared byChris Lattner
loops and their subloops. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26118 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-11remove dead exprChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26116 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-09Teach loopsimplify to update et-forest. Patch contributed by Daniel Berlin!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25153 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13remove dead code. The exit block list is computed on demand, thus does notChris Lattner
need to be updated. This code is a relic from when it did. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22775 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10remove some trickiness that broke yacr2 and some other programs last nightChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22751 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10Make loop-simplify produce better loops by turning PHI nodes like X = phi [X, Y]Chris Lattner
into just Y. This often occurs when it seperates loops that have collapsed loop headers. This implements LoopSimplify/phi-node-simplify.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22746 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-05This code can handle non-dominating instructionsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22667 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-04Fix a fixme in CondPropagate.cpp by moving a PhiNode optimization intoNate Begeman
BasicBlock's removePredecessor routine. This requires shuffling around the definition and implementation of hasContantValue from Utils.h,cpp into Instructions.h,cpp git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22664 91177308-0d34-0410-b5e6-96231b3b80d8
2005-04-21Remove trailing whitespaceMisha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21427 91177308-0d34-0410-b5e6-96231b3b80d8
2005-03-25Enhance loopsimplify to preserve alias analysis instead of clobbering it.Chris Lattner
This prevents crashes on some programs when using -ds-aa -licm. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20831 91177308-0d34-0410-b5e6-96231b3b80d8
2005-03-06trivial simplificationChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20494 91177308-0d34-0410-b5e6-96231b3b80d8
2005-01-29Adjust to changes in instruction interfaces.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19900 91177308-0d34-0410-b5e6-96231b3b80d8
2004-10-17hasConstantValue will soon return instructions that don't dominate the PHI node,Chris Lattner
so prepare for this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17095 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-28Pull assignment out of for loop conditional in order for this toAlkis Evlogimenos
compile under windows. Patch contributed by Paolo Invernizzi! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16534 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-20Prototype these functions more accuratelyChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16432 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-01Changes For Bug 352Reid Spencer
Move include/Config and include/Support into include/llvm/Config, include/llvm/ADT and include/llvm/Support. From here on out, all LLVM public header files must be under include/llvm/. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16137 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-29Fix #includes of i*.h => Instructions.h as per PR403.Misha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15334 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-15Fix PR404 try #2Chris Lattner
This version takes about 1s longer than the previous one (down to 2.35s), but on the positive side, it actually works :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14856 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-15Revert previous patch until I get a bug fixedChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14853 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-15Fix PR404: Loop simplify is really slow on 252.eonChris Lattner
This eliminates an N*N*logN algorithm from the loop simplify pass, replacing it with a much simpler and faster alternative. In a debug build, this reduces gccas time on eon from 85s to 42s. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14851 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-18Correct rewriting of exit blocks after my last patchChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13048 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-18Change the ExitBlocks list from being explicitly contained in the LoopChris Lattner
structure to being dynamically computed on demand. This makes updating loop information MUCH easier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13045 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-13Fix LoopSimplify/2004-04-13-LoopSimplifyUpdateDomFrontier.llChris Lattner
LoopSimplify was not updating dominator frontiers correctly in some cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12890 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-13Refactor code a bit to make it simpler and eliminate the gotoChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12888 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-13This patch addresses PR35: Loop simplify should reconstruct nested loops.Chris Lattner
This is fairly straight-forward, but was a real nightmare to get just perfect. aarg. :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12884 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-01Remove some assertions that are now bogus with the last patch I put inChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12595 91177308-0d34-0410-b5e6-96231b3b80d8
2004-04-01Fix PR306: Loop simplify incorrectly updates dominator informationChris Lattner
Testcase: LoopSimplify/2004-04-01-IncorrectDomUpdate.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12592 91177308-0d34-0410-b5e6-96231b3b80d8
2004-03-16Fix a regression from this patch:Chris Lattner
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20040308/013095.html Basically, this patch only updated the immediate dominatees of the header node to tell them that the preheader also dominated them. In practice, ALL dominatees of the header node are also dominated by the preheader. This fixes: LoopSimplify/2004-03-15-IncorrectDomUpdate. and PR293 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12434 91177308-0d34-0410-b5e6-96231b3b80d8
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