search for: acyclic

Hi, Regarding the mischeduler, I wonder // For loops that are acyclic path limited, aggressively schedule for // latency. This can result in very long dependence chains scheduled in // sequence, so once every cycle (when CurrMOps == 0), switch to normal // heuristics. if (Rem.IsAcyclicLatencyLimited && !Zone->getCurrMOps() && tryLatency(TryCan...

This proposal adds support for path profiling [Ball96] to LLVM. Path profiling compactly represents acyclic paths in a directed acyclic graph representation of the control flow graph of a routine. Instrumentation can be added to uniquely identify paths executed at runtime. Path profiles enable precise enumeration of the sequence of basic blocks executed in order for a particular path. Using path profiles...

...he trees be replaced by a type DAG then. While working on this compiler <http://disciple.ouroborus.net/>, I ended up using an undirected graph to represent aliasing instead, I believe it might be suitable for TBAA's purposes as well, for the following reasons. * Does the graph need to be acyclic? Consider these struct types: struct a { type1 x; type2 y } struct b { type2 y; type3 z } struct c { type3 z; type1 x } They form the following alias graph (sorry about the crappy ascii art): a --> b --> c -+ ^______________| Which won't be representable if we f...

Dear all, Is there a function in R that checks transitivity and acyclicity of a given nXn matrix with entries representing a decision-maker's comparisons of n objects? Like 0 1 0 1 1 1 0 0 0 1 0 0 1 0 0 0 1 1 0 0 1 0 0 0 0 1 0 1 0 1 0 1 0 1 0 0 1 represents xPy and 0 represents ~xPy. Is there a vectorized solution to this? n can be quite large. Thanks in advan...

Hi, Is there is any R package or existing codes in R to detect cycles in a graphical model or DAG  (Directed Acyclic Graph) ? Thanks. [[alternative HTML version deleted]]

...nt operations - Auditing SimplifyCFG for additional transforms that break convergent guarantees *** WHY *** SPMD/SIMT programming models are a family of related programming models in which multiple threads execute in a per-instruction lockstep fashion. Predication is typically used to implement acyclic control flow that would otherwise diverge the PC address of the lockstep threads. In these models, each thread's register set is typically indepedent, but there exist a small number of important circumstances in which a thread may access register storage from one of its lockstep neighbors. Ex...

Hi, How might I use xyplot to plot segments where the segments are in the input data? (ie a directed acyclic forest). Here's an example in base graphics: n = data.frame(id = c(1,2,3,4), parent = c(0,1,2,2), value = c(5,5.5,7,3), date = c(1,2,3,3.5)) plot(n$date, n$value) do.call( segments, with( merge(n,n,by.x="parent", by.y="id"), data.frame(x0=date.x, y0=value....

Aloha all, I have an adjacency matrix for an acyclic digraph that contains transitive relations, e.g. (u,v), (v,w), (u,w). I want a DAG with only intransitive relations. Can someone point me to an R function that will take my adjacency matrix and give me back one with only intransitive relations? In the example, I'd like to get rid of (u,w) an...

...gisterInfo.td input file. 3. Describe the instruction set of the target. Use "TableGen" to generate code for target-specific instructions from target-specific versions of TargetInstrFormats.td andTargetInstrInfo.td. 4. Describe the selection and conversion of the LLVM IR from a Directed Acyclic Graph (DAG) representation of instructions to native target-specific instructions. Use "TableGen" to generate code that matches patterns and selects instructions based on additional information in a target-specific version of TargetInstrInfo.td. I have already read the document "Tab...

...transforms that break convergent guarantees >> >> *** WHY *** >> >> SPMD/SIMT programming models are a family of related programming models in >> which multiple threads execute in a per-instruction lockstep fashion. >> Predication is typically used to implement acyclic control flow that would >> otherwise diverge the PC address of the lockstep threads. >> >> In these models, each thread's register set is typically indepedent, but there >> exist a small number of important circumstances in which a thread may access >> register st...

...plifyCFG for additional transforms that break convergent guarantees > > *** WHY *** > > SPMD/SIMT programming models are a family of related programming models in > which multiple threads execute in a per-instruction lockstep fashion. > Predication is typically used to implement acyclic control flow that would > otherwise diverge the PC address of the lockstep threads. > > In these models, each thread's register set is typically indepedent, but there > exist a small number of important circumstances in which a thread may access > register storage from one of it...

...se mutually recursive types are impossible. > However, It's entirely possible that Dan has described a > representation/implementation that causes cycles :) I believe you are right. I'm not saying cycles are bad, for my use case I don't actually care whether the representation is acyclic or not, it's just to make sure we don't make the graph more restrictive than it has to be. >> The reason why I assumed direction wasn't needed is because I thought the >> relation `alias` was symmetric: if x aliases y then y alias x in all cases. >> Is this the case f...

...ition under which an instruction will be "reached" -- this is straightforward since my input program is not allowed to have cycles in the CFG. 2) Run a pass that requires the above analysis and uses it to: - merge all basic blocks in topological sort order (which exists, because CFG is acyclic). - insert appropriate instructions to generate the predicates. - change all PHI-nodes into Select nodes. - predicate memory operations (well, at least the stores). It is this final predication step that I am not sure how to handle. Since LLVM does not have predicated load/store instructi...

...ts of Samba) would build as you suggest because it does identify real-world issues. While this file has no static data, if a C file is linked in twice with static data the results can be un-desired. >From here however you can only try, and work to break up our dependency list into a directed acyclic graph. This is harder than is looks! Finally, perhaps you could detail what you are hoping to achieve with a static rpcclient? We may have another way to assist you with your aims. Sorry, Andrew Bartlett -- Andrew Bartlett http://samba.org/~abartlet/ Authentication Deve...

...cell values quickly. Each cell of a spreadsheet contains an expression, much like an expression in any programming language. The big difference is that the ordering of the expression evaluations is governed by the dependencies of each cell on other cells and end up being turned into a directed acyclic graph (DAG). It would be good if the actual conversion of cell expressions from strings that the user enters into a cell, would be converted into a representation that can be recalculated very quickly. I was thinking that LLVM machine code might be a good target. Overall, is this a good proje...

Dear R developers, these days I'm working on some R code for fitting completely generic Bayesian Hierarchical Models in R, a la OpenBUGS and JAGS. A key feature of OpenBUGS and JAGS is that they automatically build an appropriate MCMC sampler from a generic model, specified as a directed acyclic graph (DAG). The spirit of my (would-be) implementation is instead more focused on experimentation and prototyping, i.e. is the user who explicitely assign samplers for each model variable after specifying the model. The sampler can be chosed in a set of predefined samplers, as well as customly spe...

...gt; ``` > > Each instruction forms a DAG with its operands being subnodes. > > The core instruction selection logic just looks for the pattern `(set > GPR:$rd, (add GPR:$rA, GPR:$rB))`. It then becomes a simple substitution. > This is a DAG because there all nodes are directed and acyclic. > Am I correct in my understanding that each node can either be a register or of type SDNode defined in TargetSelectionDAG.td? > On Thu, Jan 28, 2016 at 7:33 PM, Rail Shafigulin via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > >> I'm confused about how to speci...

...le. > > 3. Describe the instruction set of the target. Use "TableGen" to generate code for target-specific instructions from target-specific versions of TargetInstrFormats.td andTargetInstrInfo.td. > > 4. Describe the selection and conversion of the LLVM IR from a Directed Acyclic Graph (DAG) representation of instructions to native target-specific instructions. Use "TableGen" to generate code that matches patterns and selects instructions based on additional information in a target-specific version of TargetInstrInfo.td. > > I have already read the documen...

...rms that break convergent >> guarantees >> >> *** WHY *** >> >> SPMD/SIMT programming models are a family of related programming models in >> which multiple threads execute in a per-instruction lockstep fashion. >> Predication is typically used to implement acyclic control flow that would >> otherwise diverge the PC address of the lockstep threads. >> >> In these models, each thread's register set is typically indepedent, but >> there >> exist a small number of important circumstances in which a thread may >> access &gt...

I'm confused about how to specify DAG patterns for a given instruction Here is an example for my target class ALU1_RR<bits<4> subOp, string asmstr, SDNode OpNode> : ALU_RR<subOp, asmstr, [(set GPR:$rD, (OpNode (i32 GPR:$rA), (i32 GPR:$rB)))]>; def ADD : ALU1_RR<0x0, "l.add", add>; The set operation simply creates a list. The add operation