similar to: [LLVMdev] Control dependence analysis?

On 12/19/11 9:55 PM, Mark Lacey wrote: > Does LLVM contain any control dependence analysis pass? There is a PostDominatorTree analysis. Control-dependence can be computed easily using it (see the paper "Efficiently computing static single assignment form and the control dependence graph" by Cytron et. al. for details on the algorithm). -- John T. > > I do not see one when

Hi Guys, I saw in the API that DominanceFrontier has been deprecated. Is this for real? I have read the computational issues but shouldn't that be left to the users of llvm? My concern is I am writing a Control Dependence module that uses Dominance-Frontier information. Getting rid of Dominance Frontiers will put me in a tight spot. George -------------- next part -------------- An HTML

Thank you John. Actually the opt tool (from LLVM 3.2 version) can generate the needed graphs (with pass "-domfrontier"). But I just want to surely know is there some pass or builder which can be integrated somehow so it will be possible directly to generate CDG? -- View this message in context: http://llvm.1065342.n5.nabble.com/Control-Dependence-Graph-builder-tp56687p56689.html Sent

On Mon, Jun 29, 2015 at 10:16 AM, Evgeny Astigeevich <Evgeny.Astigeevich at arm.com> wrote: > Hi Anirudh, > > > > I hope these lecture slides about SSA and the dominance frontier will help > you with SSA and control flow analysis: > > > > http://www.seas.harvard.edu/courses/cs252/2011sp/slides/Lec04-SSA.pdf > > > > Unfortunately a use of

Hi, In browsing through the LLVM source, I don't currently see an implementation for a control dependence graph builder. Am I overlooking something? It doesn't look like LLVM currently provides a way to build the post-dominance frontier of the reverse CFG, either. Dominators.h mentions forward dominators, but I believe all this is referring to is dominators as opposed to post-dominators,

George Baah <georgebaah at gmail.com> writes: > Hi Guys, > > I saw in the API that DominanceFrontier has been deprecated. Is this > for real? > I have read the computational issues but shouldn't that be left to the > users of llvm? > My concern is I am writing a Control Dependence module that uses > Dominance-Frontier information. > Getting rid of Dominance

On 4/12/13 3:19 PM, Arsen wrote: > Thank you John. > Actually the opt tool (from LLVM 3.2 version) can generate the needed graphs > (with pass "-domfrontier"). > But I just want to surely know is there some pass or builder which can be > integrated somehow so it will be possible directly to generate CDG? Yes and no. There's isn't a control dependence pass in LLVM

On Dec 23, 2011, at 1:35 PM, Preston Briggs wrote: > Reading the comments in Analysis/DominanceFrontier.h, I see a note that the structure is deprecated and we're not to use it for anything new. > > Has it been replaced with something equally useful, or shall I redo the calculation for myself, or ...? We're hoping to remove them, because they're inherently an N^2 data

Reading the comments in Analysis/DominanceFrontier.h, I see a note that the structure is deprecated and we're not to use it for anything new. Has it been replaced with something equally useful, or shall I redo the calculation for myself, or ...? Thanks, Preston -------------- next part -------------- An HTML attachment was scrubbed... URL:

Hello All, I am interested in Control Dependence Graph building using the CFG and Dominance Frontier provided by corresponding passes. Just wandering whether LLVM provides some kind of pass or builder which will generate the Control Dependence Graph? Thanks, Arsen -- View this message in context: http://llvm.1065342.n5.nabble.com/Control-Dependence-Graph-builder-tp56687.html Sent from the

In the literature (see below for a reference), when a dominance frontier is computed, it is computed from a CFG that contains a dummy entry node and dummy exit node. Further, those dummy nodes are potential members of the (post-)dominance frontier for a given basic block. In LLVM, I could not figure out a way to determine if the dummy entry node is a member of the post-dominance frontier of

On Tue, Jun 2, 2009 at 3:05 PM, Eli Friedman <eli.friedman at gmail.com> wrote: > > Try PostDominators.h. > Yes, I seemed to have blanked out there for minute and thought I needed something other than the post-dominance frontier. Mark -------------- next part -------------- An HTML attachment was scrubbed... URL:

On Fri, Dec 23, 2011 at 3:53 PM, Chris Lattner <clattner at apple.com> wrote: > > > On Dec 23, 2011, at 1:35 PM, Preston Briggs wrote: > > > Reading the comments in Analysis/DominanceFrontier.h, I see a note that the structure is deprecated and > > we're not to use it for anything new. > > > > Has it been replaced with something equally useful, or

On Thu, 9 Nov 2006, Ryan M. Lefever wrote: Sorry I never responded to this: > In the literature (see below for a reference), when a dominance frontier > is computed, it is computed from a CFG that contains a dummy entry node > and dummy exit node. Further, those dummy nodes are potential members > of the (post-)dominance frontier for a given basic block. In LLVM, I > could not

On Sat, Jan 7, 2012 at 12:14 AM, Cameron Zwarich <zwarich at apple.com> wrote: > On Jan 6, 2012, at 8:27 PM, Daniel Berlin wrote: > > Note: GCC takes exactly the same approach as LLVM here, for exactly > the reason chris specifies. > In fact, until we started local SSA updating (which is now many years > ago, but ...), dominance frontier calculation for ssa updating was in

On Jan 6, 2012, at 8:27 PM, Daniel Berlin wrote: > Note: GCC takes exactly the same approach as LLVM here, for exactly > the reason chris specifies. > In fact, until we started local SSA updating (which is now many years > ago, but ...), dominance frontier calculation for ssa updating was in > the top 10 profile functions for GCC compiles of large source files. > I had tried a

Here's how I did things, back when I got to write my own infrastructure. It's still O(n^2) in the worst case, but *much* quicker in the expected case. Number all the basic blocks, 0 to n-1 and build a vector mapping from integer to block. Requires O(n) time and space. For each block, compute the set containing it's dominance frontier, based on Figure 10 of * * *Efficiently

On Fri, Jan 6, 2012 at 8:17 PM, Chris Lattner <clattner at apple.com> wrote: > > On Jan 6, 2012, at 5:08 PM, Chris Lattner wrote: > >>>> >>>> It's very like SSA construction, but must make provision >>>> testing anti dependences.  I had planned to use dominance frontiers to >>>> guide placement of phi nodes, as usual. >>>

Many published analyses which build on post-dominance assume a canonical single-dominator-tree form induced by unifying all exits (and often adding a virtual edge from START to END). In contrast, it seems that the current LLVM post-dominator analysis only operates in a mode in which it generates a forest of post-dominator trees, with one rooted at each exit node. The problem this can cause is

On 07/13/2012 04:30 PM, Duncan Sands wrote: > Hi, > >> I found the -postdomfrontier pass in *llvm*.org/docs/Passes.html, but >> 'opt' does not accept it. I could not find the relevant codes in >> PostDominance.cpp in SVN trunk, but I found some relevant codes here >> http://opensource.apple.com/source/clang/clang-137/src/lib/Analysis/PostDominators.cpp.