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2011-01-03fix PR8895: metadata operands don't have a strong use of theirChris Lattner
nested values, so they can change and drop to null, which can change the hash and cause havok. It turns out that it isn't a good idea to value number stuff with metadata operands anyway, so... don't. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122758 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03Speed up instsimplify by about 10-15% by not bothering to retryDuncan Sands
InstructionSimplify on instructions that didn't change since the last time round the loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122745 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03Switch a worklist in CodeGenPrepare to SmallVector and increase the inlineCameron Zwarich
capacity on the Visited SmallPtrSet. On 403.gcc, this is about a 4.5% speedup of CodeGenPrepare time (which itself is 10% of time spent in the backend). This is progress towards PR8889. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122741 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03earlycse can do trivial with-a-block dead store Chris Lattner
elimination as well. This deletes 60 stores in 176.gcc that largely come from bitfield code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122736 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03switch the load table to use a recycling bump pointer allocator,Chris Lattner
speeding earlycse up by 6%. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122733 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03now that loads are in their own table, we can implementChris Lattner
store->load forwarding. This allows EarlyCSE to zap 600 more loads from 176.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122732 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03split loads and calls into separate tables. Loads are now just indexedChris Lattner
by their pointer instead of using MemoryValue to wrap it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122731 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03various cleanups, no functionality change.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122729 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03Teach EarlyCSE to do trivial CSE of loads and read-only calls.Chris Lattner
On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122727 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03rename InstValue to SimpleValue, add some comments.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122725 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03CMake: Add missing source file.Michael J. Spencer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122724 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03Allocate nodes for the scoped hash table from a recyling bump pointerChris Lattner
allocator. This speeds up early cse by about 20% git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122723 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03reduce redundancy in the hashing code and other misc cleanups.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122720 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-03Add a new loop-instsimplify pass, with the intention of replacing the instanceCameron Zwarich
of instcombine that is currently in the middle of the loop pass pipeline. This commit only checks in the pass; it will hopefully be enabled by default later. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122719 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02fix some pastosChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122718 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02add DEBUG and -stats output to earlycse.Chris Lattner
Teach it to CSE the rest of the non-side-effecting instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122716 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02Enhance earlycse to do CSE of casts, instsimplify and die.Chris Lattner
Add a testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122715 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
2011-01-02sketch out a new early cse pass. No functionality yet.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122713 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02fix a miscompilation of tramp3d-v4: when forming a memcpy, we have to makeChris Lattner
sure that the loop we're promoting into a memcpy doesn't mutate the input of the memcpy. Before we were just checking that the dest of the memcpy wasn't mod/ref'd by the loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122712 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02If a loop iterates exactly once (has backedge count = 0) then don'tChris Lattner
mess with it. We'd rather peel/unroll it than convert all of its stores into memsets. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122711 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02Also remove functions that use complex constant expressions in terms ofNick Lewycky
another function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122705 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02enhance loop idiom recognition to scan *all* unconditionally executedChris Lattner
blocks in a loop, instead of just the header block. This makes it more aggressive, able to handle Duncan's Ada examples. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122704 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02make inSubLoop much more efficient.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122703 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02rip out isExitBlockDominatedByBlockInLoop, calling DomTree::dominates instead.Chris Lattner
isExitBlockDominatedByBlockInLoop is a relic of the days when domtree was *just* a tree and didn't have DFS numbers. Checking DFS numbers is faster and easier than "limiting the search of the tree". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122702 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02add a list of opportunities for future improvement.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122701 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02Fix PR8702 by not having LoopSimplify claim to preserve LCSSA form. As ↵Duncan Sands
described in the PR, the pass could break LCSSA form when inserting preheaders. It probably would be easy enough to fix this, but since currently we always go into LCSSA form after running this pass, doing so is not urgent. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122695 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02Allow loop-idiom to run on multiple BB loops, but still only scan the loop Chris Lattner
header for now for memset/memcpy opportunities. It turns out that loop-rotate is successfully rotating loops, but *DOESN'T MERGE THE BLOCKS*, turning "for loops" into 2 basic block loops that loop-idiom was ignoring. With this fix, we form many *many* more memcpy and memsets than before, including on the "history" loops in the viterbi benchmark, which look like this: for (j=0; j<MAX_history; ++j) { history_new[i][j+1] = history[2*i][j]; } Transforming these loops into memcpy's speeds up the viterbi benchmark from 11.98s to 3.55s on my machine. Woo. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122685 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02remove debugging code.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122683 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02add some -stats output.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122682 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02improve loop rotation to use CodeMetrics to analyze theChris Lattner
size of a loop header instead of its own code size estimator. This allows it to handle bitcasts etc more precisely. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122681 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02teach loop idiom recognition to form memcpy's from simple loops.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122678 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02Remove functions from the FnSet when one of their callee's is being merged. ThisNick Lewycky
maintains the guarantee that the DenseSet expects two elements it contains to not go from inequal to equal under its nose. As a side-effect, this also lets us switch from iterating to a fixed-point to actually maintaining a work queue of functions to look at again, and we don't add thunks to our work queue so we don't need to detect and ignore them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122677 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-01fix a globalopt crash on two Adobe-C++ testcases that the recentChris Lattner
loop idiom pass exposed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122674 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-01add a validity check that was missed, fixing a crash on theChris Lattner
new testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122662 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-01improve validity check to handle constant-trip-count loops moreChris Lattner
aggressively. In practice, this doesn't help anything though, see the todo. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122660 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-01implement the "no aliasing accesses in loop" safety check. This passChris Lattner
should be correct now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122659 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-31Simplify this pass by using a depth-first iterator to ensure that allDuncan Sands
operands are visited before the instructions themselves. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122647 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-31Zap dead instructions harder.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122645 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-30Make a bunch of symbols internal.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122642 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-28simplify this, isBytewiseValue handles the extra check. We stillChris Lattner
check for "multiple of a byte" in size to make it clear that the >> 3 below is safe. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122604 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-28Silence gcc warning about an unused variable when doing a release build.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122593 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-27fix some issues Frits noticed, add AliasAnalysis as a dependencyChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122585 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-27BuildLibCalls: Nuke EmitMemCpy, EmitMemMove and EmitMemSet. They are dead ↵Benjamin Kramer
and superseded by IRBuilder. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122576 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-27SimplifyLibCalls: Use IRBuilder to simplify code.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122575 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-27have loop-idiom nuke instructions that feed stores that get removed.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122574 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-26implement enough of the memset inference algorithm to recognize and insert Chris Lattner
memsets. This is still missing one important validity check, but this is enough to compile stuff like this: void test0(std::vector<char> &X) { for (std::vector<char>::iterator I = X.begin(), E = X.end(); I != E; ++I) *I = 0; } void test1(std::vector<int> &X) { for (long i = 0, e = X.size(); i != e; ++i) X[i] = 0x01010101; } With: $ clang t.cpp -S -o - -O2 -emit-llvm | opt -loop-idiom | opt -O3 | llc to: __Z5test0RSt6vectorIcSaIcEE: ## @_Z5test0RSt6vectorIcSaIcEE ## BB#0: ## %entry subq $8, %rsp movq (%rdi), %rax movq 8(%rdi), %rsi cmpq %rsi, %rax je LBB0_2 ## BB#1: ## %bb.nph subq %rax, %rsi movq %rax, %rdi callq ___bzero LBB0_2: ## %for.end addq $8, %rsp ret ... __Z5test1RSt6vectorIiSaIiEE: ## @_Z5test1RSt6vectorIiSaIiEE ## BB#0: ## %entry subq $8, %rsp movq (%rdi), %rax movq 8(%rdi), %rdx subq %rax, %rdx cmpq $4, %rdx jb LBB1_2 ## BB#1: ## %for.body.preheader andq $-4, %rdx movl $1, %esi movq %rax, %rdi callq _memset LBB1_2: ## %for.end addq $8, %rsp ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122573 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-26start using irbuilder to make mem intrinsics in a few passes.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122572 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-26sketch more of this out.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122567 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
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