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path: root/lib/Transforms/Scalar/LoopUnswitch.cpp
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2006-02-22Add some comments, simplify some code, and fix a bug that caused rewritingChris Lattner
to rewrite with the wrong value. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26311 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-18improved support for branch folding, still not enabled.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26289 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-18Implement deletion of dead blocks, currently disabled.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26285 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-18a previous patch completely disabled trivial unswitching, this fixees it.Chris Lattner
Thanks to nate for pointing this out :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26280 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-18initial trivial support for folding branches that have now-constant ↵Chris Lattner
destinations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26279 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-18When unswitching a loop, make sure to update loop info with exit blocks inChris Lattner
the right loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26277 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-17Fix loops where the header has an exit, fixing a loop-unswitch crash on craftyChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26258 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-17start of some new simplification code, not thoroughly tested, use at your ownChris Lattner
risk :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26248 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-16Change SplitBlock to increment a BasicBlock::iterator, not an Instruction*. ↵Chris Lattner
Apparently they do different things :) This fixes a testcase that nate reduced from spass. Also included are a couple minor code changes that don't affect the generated code at all. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26235 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-16Fix VC++ warning.Jeff Cohen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26228 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-16fix a bug where we unswitched the wrong wayChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26225 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-15Implement trivial unswitching for switch stmts. This allows us to trivialChris Lattner
unswitch this loop on 2 before sweating to unswitch on 1/3. void test4(int N, int i, int C, int*P, int*Q) { int j; for (j = 0; j < N; ++j) { switch (C) { // general unswitching. default: P[i+j] = 0; break; case 1: Q[i+j] = 0; break; case 3: P[i+j] = Q[i+j]; break; case 2: break; // TRIVIAL UNSWITCH on C==2 } } } git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26223 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-15make "trivial" unswitching significantly more general. It can now handleChris Lattner
this for example: for (j = 0; j < N; ++j) { // trivial unswitch if (C) P[i+j] = 0; } turning it into the obvious code without bothering to duplicate an empty loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26220 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-15Checking the wrong value. This caused us to emit silly code likeChris Lattner
Y = seteq bool X, true instead of just using X :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26215 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-15more refactoring, no functionality change.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26194 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-15pull some code out into a functionChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26191 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-14Use statistics to keep track of what flavors of loops we are unswitchingChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26157 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-11implement unswitching of loops with switch stmts and selects in themChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26114 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-10Update PHI nodes in successors of exit blocks.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26113 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-10Reform the unswitching code in terms of edge splitting, not block splitting.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26112 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-10Fix a case where UnswitchTrivialCondition broke critical edges withChris Lattner
phi's in the successors git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26108 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-10add some notes, move some code around. Implement unswitching of loopsChris Lattner
with branches on partially invariant computations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26104 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-10Move code around to be more logical, no functionality change.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26103 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-10When unswitching a trivial loop, do admit we are doing it! :)Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26102 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-10Implement unconditional unswitching of 'trivial' loops, those loops that containChris Lattner
branches in their entry block that control whether or not the loop is a noop or not. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26101 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-09Simplify control flow a bit, note that unswitch preserves canonical loop formChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26098 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-09Make the threshold a parameterChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26093 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-09Simplify the loop-unswitch pass, by not even trying to unswitch loops withChris Lattner
uses of loop values outside the loop. We need loop-closed SSA form to do this right, or to use SSA rewriting if we really care. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26089 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-22Make iostream #inclusion explicitChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25514 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
2005-01-06Put createLoopUnswitchPass() into proper namespaceJeff Cohen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19306 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-03Fixes to make LLVM compile with vc7.1.Alkis Evlogimenos
Patch contributed by Paolo Invernizzi! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16152 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
2004-04-19Initial checkin of a simple loop unswitching pass. It still needs work,Chris Lattner
but it's a start, and seems to do it's basic job. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13068 91177308-0d34-0410-b5e6-96231b3b80d8
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