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2008-04-04Undo PHI elimination copy placement patch. This causes coalescing ↵Evan Cheng
(performace) issues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49198 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-04This is done.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49197 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-03if some functions don't have debug info, we were outputing the same label at ↵Andrew Lenharth
the start of each of those functions. This makes assemblers unhappy git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49176 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-03- Turn copies of implicit_def into implicit_def instructions.Evan Cheng
- Be smarter about coalescing copies from implicit_def. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49168 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-03Special handling of zero-sized live intervals.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49167 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-03- Treat a live range defined by an implicit_def as a zero-sized one.Evan Cheng
- Eliminate an implicit_def when it's being spilled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49166 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-03- PHI elimination also eliminates implicit_def that fits into a PHI node ↵Evan Cheng
rather than copying it. - Be (slightly) smarter about where to place the copies. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49165 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-03Start of a series of patches related to implicit_def.Evan Cheng
There is no point in creating a long live range defined by an implicit_def. Scheduler now duplicates implicit_def instruction for each of its uses. Therefore, if an implicit_def node has multiple uses, it will become a number of very short live ranges, rather than a long one. This will make coalescer's job easier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49164 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-03Backing out 48222 temporarily.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49124 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-02Make EH work with unnamed functions. Reenable runningDale Johannesen
StripSymbols when EH is on. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49110 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-02Now that I am told MachineRegisterInfo also tracks physical register uses / ↵Evan Cheng
defs, I can do away with the horribleness I introduced a while back. It's impossible to detect if there is any use of a physical register below an instruction (and before any def of the register) with some cheap book keeping. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49105 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-02Remove #include<map> from LiveVariables.h. Not referenced.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49099 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-02Cosmetic changes per EH patch review feedback.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49096 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-02In some situations, we need to check for local interferences between the PHIOwen Anderson
node and its inputs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49070 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-02Correctly mark a valno that was previous defined by a PHI node as having anOwen Anderson
unknown defining inst after PHI elimination. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49069 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-02Recommitting EH patch; this should answer most of theDale Johannesen
review feedback. -enable-eh is still accepted but doesn't do anything. EH intrinsics use Dwarf EH if the target supports that, and are handled by LowerInvoke otherwise. The separation of the EH table and frame move data is, I think, logically figured out, but either one still causes full EH info to be generated (not sure how to split the metadata correctly). MachineModuleInfo::needsFrameInfo is no longer used and is removed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49064 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-01Re-materialization is for uses only.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49053 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-01Revert 49006 for the moment.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49046 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-01Don't dereference MBB->end().Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49043 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-01More soft fp fixes.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49016 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-01Pasto.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49014 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-01Add comment.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49013 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-01Unbreak ARM / Thumb soft FP support.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49012 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-31Emit exception handling info for functions which areDale Johannesen
not marked nounwind, or for all functions when -enable-eh is set, provided the target supports Dwarf EH. llvm-gcc generates nounwind in the right places; other FEs will need to do so also. Given such a FE, -enable-eh should no longer be needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49006 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-31It's not safe to fold a load from GV stub or constantpool into a two-address ↵Evan Cheng
use. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49002 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-31Move reMaterialize() from TargetRegisterInfo to TargetInstrInfo.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48995 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-31Fix a DAGCombiner optimization to respect volatile qualification.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48994 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-31The support for remat of instructions with a register operand is hackish, to ↵Evan Cheng
say the least. Since the register operand guaranteed to be PIC base and that it is already live at all uses, we are making sure it will not be spilled after its uses are rematerialized for both performance and correctness reasons. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48976 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-31Fix a major bug in the DFS calculation. Thanks for Christopher Lamb for ↵Owen Anderson
pointing this out. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48973 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-30Fix "Control reaches the end of non-void function" warnings, Chris Lattner
patch by David Chisnall. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48963 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-29Cosmetic changes.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48947 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-29Remove some unneeded code for LiveInterval joining, and fix a bug in the Phi ↵Owen Anderson
elimination algorithm where we were accidentally reasoning about the source rather than the destination. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48936 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-28ifdef out a dead function. Should this be removed?Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48916 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-28Rename getAnyLoad to getLoad is suggested by Evan.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48914 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-28New entry.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48908 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-27Implement LegalizeTypes support for softfloat LOAD.Duncan Sands
In order to handle indexed nodes I had to introduce a new constructor, and since I was there I factorized the code in the various load constructors. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48894 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-27Avoid creating chain dependencies from CopyToReg nodes to load and storeDan Gohman
nodes. This doesn't currently have much impact the generated code, but it does produce simpler-looking SelectionDAGs, and consequently simpler-looking ScheduleDAGs, because there are fewer spurious dependencies. In particular, CopyValueToVirtualRegister now uses the entry node as the input chain dependency for new CopyToReg nodes instead of calling getRoot and depending on the most recent memory reference. Also, rename UnorderedChains to PendingExports and pull it up from being a local variable in SelectionDAGISel::BuildSelectionDAG to being a member variable of SelectionDAGISel, so that it doesn't have to be passed around to all the places that need it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48893 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-27Fix spelling. Thanks, Duncan! :-)Roman Levenstein
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48873 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-27Speed-up the SumOfUnscheduledPredsOfSuccs by introducing a new functionRoman Levenstein
called LimitedSumOfUnscheduledPredsOfSuccs. It terminates the computation after a given treshold is reached. This new function is always faster, but brings real wins only on bigger test-cases. The old function SumOfUnscheduledPredsOfSuccs is left in-place for now and therefore a warning about an unused static function is produced. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48872 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-27Fix a memory bug: increment an iterator of a deleted machine instr.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48853 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-26Fix a bug in Darwin EH: FDE->CIE pointer mustDale Johannesen
be relocatable. Describe why .set is needed better. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48848 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-26One more coalescer fix wrt deadness propagation.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48837 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-26Avoid commuting a def MI in order to coalesce a copy instruction away if any ↵Evan Cheng
use of the same val# is a copy instruction that has already been coalesced. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48833 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-26Use a linked data structure for the uses lists of an SDNode, just like Roman Levenstein
LLVM Value/Use does and MachineRegisterInfo/MachineOperand does. This allows constant time for all uses list maintenance operations. The idea was suggested by Chris. Reviewed by Evan and Dan. Patch is tested and approved by Dan. On normal use-cases compilation speed is not affected. On very big basic blocks there are compilation speedups in the range of 15-20% or even better. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48822 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-26Fixed some spelling errors. Thanks, Duncan!Roman Levenstein
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48819 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-26Some improvements related to the computation of isReachable.Roman Levenstein
This fixes Bugzilla #1835 (http://llvm.org/bugs/show_bug.cgi?id=1835). This patched is reviewed by Tanya and Dan. Dan tested and approved it. The reason for the bad performance of the old algorithm is that it is very naive and scans every time all nodes of the DAG in the worst case. This patch introduces a new algorithm based on the paper "Online algorithms for maintaining the topological order of a directed acyclic graph" by David J.Pearce and Paul H.J.Kelly. This is the MNR algorithm. It has a linear time worst-case and performs much better in most situations. The paper can be found here: http://fano.ics.uci.edu/cites/Document/Online-algorithms-for-maintaining-the-topological-order-of-a-directed-acyclic-graph.html The main idea of the new algorithm is to compute the topological ordering of the SNodes in the DAG and to maintain it even after DAG modifications. The topological ordering allows for very fast node reachability checks. Tests on very big input files with tens of thousands of instructions in a BB indicate huge speed-ups (up to 10x compilation time improvement) compared to the old version. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48817 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-26Dead PHI instructions need to be handled specially.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48811 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-25Remove some debugging code.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48803 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-25StrongPHIElimination doesn't support swapping live intervals like the ↵Owen Anderson
coalescer does. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48802 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-25A quick nm audit turned up several fixed tables and objects that wereDan Gohman
marked read-write. Use const so that they can be allocated in a read-only segment. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48800 91177308-0d34-0410-b5e6-96231b3b80d8
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