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path: root/lib/CodeGen/BranchFolding.cpp
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2008-07-01Fix longstanding thinko: don't excludeDale Johannesen
predessors of exit blocks from tail merging consideration. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52985 91177308-0d34-0410-b5e6-96231b3b80d8
2008-07-01Split ISD::LABEL into ISD::DBG_LABEL and ISD::EH_LABEL, eliminatingDan Gohman
the need for a flavor operand, and add a new SDNode subclass, LabelSDNode, for use with them to eliminate the need for a label id operand. Change instruction selection to let these label nodes through unmodified instead of creating copies of them. Teach the MachineInstr emitter how to emit a MachineInstr directly from an ISD label node. This avoids the need for allocating SDNodes for the label id and flavor value, as well as SDNodes for each of the post-isel label, label id, and label flavor. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52943 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-19Use the transferSuccessors helper function.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52495 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-23Rewrite a loop to avoid using iterators pointing toDale Johannesen
elements that have been erased. Based on a patch by Nicolas Capens. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51485 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-13Clean up the use of static and anonymous namespaces. This turned upDan Gohman
several things that were neither in an anonymous namespace nor static but not intended to be global. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51017 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-12Be more aggressive about tail-merging small blocksDale Johannesen
if those blocks consist entirely of common instructions; merging will not add an extra branch in this case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51006 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-12Further rework of tail merge algorithm. Not quiteDale Johannesen
semantically identical, but little difference in either results or execution speed; but it's much easier to read, at least IMO. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50999 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-09Remove an evil vector bool. Cosmetic refactoring,Dale Johannesen
no functional change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50921 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-09Rewrite tail merging algorithm to handle theDale Johannesen
case where there are multiple blocks with a large number of common tail instructions more efficiently (compile time optimization). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50916 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-06Make several variable declarations static.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50696 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-10Teach branch folding pass about implicit_def instructions. Unfortunately we ↵Evan Cheng
can't just eliminate them since register scavenger expects every register use to be defined. However, we can delete them when there are no intra-block uses. Carefully removing some implicit def's which enable more blocks to be optimized away. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49461 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-28Add a quick and dirty "loop aligner pass". x86 uses it to align its loops to ↵Evan Cheng
16-byte boundaries. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47703 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-19PR1909: Tail merging pass ran wild. It makes no sense to merge blocks in ↵Evan Cheng
order to save a single instruction since a branch will be inserted for each BB. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47301 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-10Rename MRegisterInfo to TargetRegisterInfo.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46930 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-29Use empty() instead of comparing size() with zero.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46514 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-07rename TargetInstrDescriptor -> TargetInstrDesc.Chris Lattner
Make MachineInstr::getDesc return a reference instead of a pointer, since it can never be null. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45695 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-07Rename MachineInstr::getInstrDescriptor -> getDesc(), which reflectsChris Lattner
that it is cheap and efficient to get. Move a variety of predicates from TargetInstrInfo into TargetInstrDescriptor, which makes it much easier to query a predicate when you don't have TII around. Now you can use MI->getDesc()->isBranch() instead of going through TII, and this is much more efficient anyway. Not all of the predicates have been moved over yet. Update old code that used MI->getInstrDescriptor()->Flags to use the new predicates in many places. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45674 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-06rename isLoad -> isSimpleLoad due to evan's desire to have such a predicate.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45667 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-06rename isStore -> mayStore to more accurately reflect what it captures.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45656 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-30Add new shorter predicates for testing machine operands for various types: Chris Lattner
e.g. MO.isMBB() instead of MO.isMachineBasicBlock(). I don't plan on switching everything over, so new clients should just start using the shorter names. Remove old long accessors, switching everything over to use the short accessor: getMachineBasicBlock() -> getMBB(), getConstantPoolIndex() -> getIndex(), setMachineBasicBlock -> setMBB(), etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45464 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-29Remove attribution from file headers, per discussion on llvmdev.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45418 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-10Improve branch folding by recgonizing that explict successor relationships ↵Christopher Lamb
impact the value of fall-through choices. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44785 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-25Changed XXX to FIXME, and added comment to the README fileBill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43359 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-25Added comment explaining why we are doing this check.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43353 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-19Don't branch fold inline asm statements.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43191 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-02More explicit keywords.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40757 91177308-0d34-0410-b5e6-96231b3b80d8
2007-07-11If assertions are not enabled, we should return False here.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38535 91177308-0d34-0410-b5e6-96231b3b80d8
2007-07-10Make this work with GLIBCXX_DEBUG.David Greene
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38516 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-29Fix misue of iterator pointing to erased object. Uncovered byDavid Greene
_GLIBCXX_DEBUG. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37793 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-18Move CorrectExtraCFGEdges() from BranchFolding.cpp to a MachineBasicBlock ↵Evan Cheng
method. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37633 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-08Make throttle a hidden parameter, per review.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37511 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-08Throttle tail merging; handling blocks with large numbers of predecessorsDale Johannesen
is too slow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37509 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-04Tail merging wasn't working for predecessors of landing pads. PR 1496.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37427 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-04Move ReplaceUsesOfBlockWith() out of BranchFolding into a MachineBasicBlock ↵Evan Cheng
general facility. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37408 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-02Fix CorrectExtraCFGEdges to allow for multiple LandingPad targets.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37394 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-01Implement smarter algorithm for choosing which blocks to tail-merge.Dale Johannesen
See test/CodeGen/X86/test-pic-jtbl.ll for a case where it works well; shaves another 10K off our favorite benchmark. I was hesitant about this because of compile speed, but seems to do OK on a bootstrap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37392 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-31Arrange for only 1 of multiple branches to landing pad to be kept.Dale Johannesen
Do not remove empty landing pads (EH table needs to be updated) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37375 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-30Changed per review comment.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37355 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-29Make stable_sort in tail merging actually be stable (it never was, but didn'tDale Johannesen
matter until my last change). Reenable tail merging by default. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37354 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-24Blocks that cond-br and uncond-br/fallthrough to same block should haveDale Johannesen
only one successor. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37324 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-24Fix for PR1444: do not create two successors to the same block.Dale Johannesen
Temporarily, this breaks CodeGen/Generic/2006-02-12-InsertLibraryCall.ll by exposing an unrelated latent problem; working on that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37323 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-23Two tail merging improvements:Dale Johannesen
When considering blocks with more than 2 predecessors, merge the block with the largest number of matching insns, rather than the first block found. Considering that 1 matching insn is enough to show a win for candidates that already end with a branch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37315 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-22Make tail merging the default, except on powerPC. There was no prior artDale Johannesen
for a target-dependent default with a command-line override; this way should be generally usable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37285 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-18Remove some unneeded branches. (spotted by Evan, thanks)Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37198 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-15Remove extra CFG edges before doing these passes; it makes them happier.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37089 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-10Do not generate branches to entry block. This fixes several test suiteDale Johannesen
failures on PPC (can happen only when prologue code is null) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36979 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-10Make tail merging handle many more cases (all it can, I think).Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36966 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-07Handle some non-exit blocks in tail merging.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36907 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-03Drop 'const'Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36662 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-02Use 'static const char' instead of 'static const int'.Devang Patel
Due to darwin gcc bug, one version of darwin linker coalesces static const int, which defauts PassID based pass identification. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36652 91177308-0d34-0410-b5e6-96231b3b80d8
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