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* Combine the implementations of the core part of the SSAUpdater andBob Wilson2010-05-041-429/+102
| | | | | | | MachineSSAUpdater to avoid duplicating all the code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103060 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a performance problem with the new SSAUpdater. This showed up in theBob Wilson2010-04-211-2/+8
| | | | | | | GCCAS time for MultiSource/Benchmarks/ASCI_Purple/SMG2000. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102009 91177308-0d34-0410-b5e6-96231b3b80d8
* Re-commit my previous SSAUpdater changes. The previous version naively triedBob Wilson2010-04-171-179/+434
| | | | | | | | | | | | to determine where to place PHIs by iteratively comparing reaching definitions at each block. That was just plain wrong. This version now computes the dominator tree within the subset of the CFG where PHIs may need to be placed, and then places the PHIs in the iterated dominance frontier of each definition. The rest of the patch is mostly the same, with a few more performance improvements added in. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101612 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert all my SSAUpdater patches. The PHI placement algorithm is not correctBob Wilson2010-04-031-315/+183
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (what was I thinking?) and there's also a problem with LCSSA. I'll try again later with fixes. --- Reverse-merging r100263 into '.': U lib/Transforms/Utils/SSAUpdater.cpp --- Reverse-merging r100177 into '.': G lib/Transforms/Utils/SSAUpdater.cpp --- Reverse-merging r100148 into '.': G lib/Transforms/Utils/SSAUpdater.cpp --- Reverse-merging r100147 into '.': U include/llvm/Transforms/Utils/SSAUpdater.h G lib/Transforms/Utils/SSAUpdater.cpp --- Reverse-merging r100131 into '.': G include/llvm/Transforms/Utils/SSAUpdater.h G lib/Transforms/Utils/SSAUpdater.cpp --- Reverse-merging r100130 into '.': G lib/Transforms/Utils/SSAUpdater.cpp --- Reverse-merging r100126 into '.': G include/llvm/Transforms/Utils/SSAUpdater.h G lib/Transforms/Utils/SSAUpdater.cpp --- Reverse-merging r100050 into '.': D test/Transforms/GVN/2010-03-31-RedundantPHIs.ll --- Reverse-merging r100047 into '.': G include/llvm/Transforms/Utils/SSAUpdater.h G lib/Transforms/Utils/SSAUpdater.cpp git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100264 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a DEBUG_TYPE for the SSAUpdater.Bob Wilson2010-04-031-0/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100263 91177308-0d34-0410-b5e6-96231b3b80d8
* Recommit 100158 now that the buildbots are happy again.Bob Wilson2010-04-021-21/+29
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100177 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert 100158 in case it is causing some of the buildbot problems.Bob Wilson2010-04-021-29/+21
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100164 91177308-0d34-0410-b5e6-96231b3b80d8
* Check for terminating conditions before adding PHIs to the worklists.Bob Wilson2010-04-021-21/+29
| | | | | | | This is more efficient than adding them to the worklist and then ignoring them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100158 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove trailing whitespace.Bob Wilson2010-04-011-5/+5
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100148 91177308-0d34-0410-b5e6-96231b3b80d8
* Rewrite another SSAUpdater function to avoid recursion.Bob Wilson2010-04-011-32/+46
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100147 91177308-0d34-0410-b5e6-96231b3b80d8
* Change another SSAUpdater function to avoid recursion.Bob Wilson2010-04-011-18/+24
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100131 91177308-0d34-0410-b5e6-96231b3b80d8
* Simplify the code to check for existing PHIs, now that it is only used inBob Wilson2010-04-011-30/+12
| | | | | | | one place. This removes the template function added in svn 94690. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100130 91177308-0d34-0410-b5e6-96231b3b80d8
* The SSAUpdater should avoid recursive traversals of the CFG, since that mayBob Wilson2010-04-011-15/+23
| | | | | | | blow out the stack for really big functions. Start by fixing an easy case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100126 91177308-0d34-0410-b5e6-96231b3b80d8
* Rewrite part of the SSAUpdater to be more careful about inserting redundantBob Wilson2010-03-311-150/+263
| | | | | | | | | PHIs. The previous algorithm was unable to reliably detect when existing PHIs in a cycle can be reused. I'm still working on reducing a testcase. Radar 7711900. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100047 91177308-0d34-0410-b5e6-96231b3b80d8
* Avoid creating redundant PHIs in SSAUpdater::GetValueInMiddleOfBlock.Bob Wilson2010-01-271-41/+75
| | | | | | | | This was already being done in SSAUpdater::GetValueAtEndOfBlock so I've just changed SSAUpdater to check for existing PHIs in both places. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94690 91177308-0d34-0410-b5e6-96231b3b80d8
* Change errs() to dbgs().David Greene2010-01-051-2/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92603 91177308-0d34-0410-b5e6-96231b3b80d8
* improve indentation avoid a pointless conversion from weakvh to trackingvh,Chris Lattner2009-12-211-3/+3
| | | | | | | no functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91848 91177308-0d34-0410-b5e6-96231b3b80d8
* fix PR5837 by having SSAUpdate reuse phi nodes for theChris Lattner2009-12-211-1/+23
| | | | | | | | | | | 'GetValueInMiddleOfBlock' case, instead of inserting duplicates. A similar fix is almost certainly needed by the machine-level SSAUpdate implementation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91820 91177308-0d34-0410-b5e6-96231b3b80d8
* add an assert to make it really clear what this is doing. Return singularval asChris Lattner2009-12-041-1/+5
| | | | | | | a compile time perf optimization to avoid a load. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90507 91177308-0d34-0410-b5e6-96231b3b80d8
* alternate fix for PR5258 which avoids worklist problems, with reduced testcase.Chris Lattner2009-10-201-11/+6
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84667 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix PR5258, jump-threading creating invalid PHIs.Edwin Török2009-10-201-2/+10
| | | | | | | | When an incoming value for a PHI is updated, we must also updated all other incoming values for the same BB to match, otherwise we create invalid PHIs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84638 91177308-0d34-0410-b5e6-96231b3b80d8
* Strip trailing white space.Duncan Sands2009-10-161-33/+31
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84256 91177308-0d34-0410-b5e6-96231b3b80d8
* add a simple helper method.Chris Lattner2009-10-101-0/+6
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83745 91177308-0d34-0410-b5e6-96231b3b80d8
* add ability for clients of SSAUpdater to find out about theChris Lattner2009-10-101-1/+9
| | | | | | | PHI nodes inserted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83744 91177308-0d34-0410-b5e6-96231b3b80d8
* add the ability to get a rewritten value from the middle of a block,Chris Lattner2009-10-101-3/+92
| | | | | | | | not just at the end. Add a big comment explaining when this could be useful (which never happens for jump threading). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83741 91177308-0d34-0410-b5e6-96231b3b80d8
* rename GetValueInBlock -> GetValueAtEndOfBlock to better reflect Chris Lattner2009-10-101-11/+11
| | | | | | | what it does. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83740 91177308-0d34-0410-b5e6-96231b3b80d8
* use a typedef instead of spelling out an insane type. Yay for auto someday.Chris Lattner2009-10-101-3/+3
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83707 91177308-0d34-0410-b5e6-96231b3b80d8
* Implement an efficient and fully general SSA update mechanism that Chris Lattner2009-10-101-0/+232
works on unstructured CFGs. This implements PR217, our oldest open PR. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83705 91177308-0d34-0410-b5e6-96231b3b80d8
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