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...he 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 Computing Static Single Assignment Form and ...* Cytron, Ferrante, Rosen, Wegman During the calculation, represent the current frontier, DF(X), as suggested in *An Efficient Representation for Sparse Sets* Briggs, Torczon This lets us add members and clear the set in constant time and allows us to enumerate the members in time proportional to the n...

...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 a basic block. Is there a way to get that information? Regards, Ryan * "Efficiently Computing Static Single Assignment Form and the Control Dependence Graph" by Cytron, Ferrante, Rosen, Wegman, and Zadeck -- Ryan M. Lefever [http://www.ews.uiuc.edu/~lefever]

Does LLVM contain any control dependence analysis pass? I do not see one when looking through the lib/Analysis passes. Thanks, Mark

...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 looking through the lib/Analysis passes. > > Thanks, > > Mark > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.ui...

...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 Computing Static Single Assignment Form and ... > Cytron, Ferrante, Rosen, Wegman > > During the calculation, represent the current frontier, DF(X), as suggested in > > An Efficient Representation for Sparse Sets > Briggs, Torczon > > This lets us add members and clear the set in constant time and allows us to enumerate the member...

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

...LLVM IR to some other non-SSA IR (like the tool's), you can do the phi node removal yourself as you convert. Basically, every predecessor block referenced by a phi node will have an assignment to that variable before branching. There are techniques to make the resultant code more efficient, see Cytron et al.[1]. [1] "Efficiently computing static single assignment form and the control dependence graph" http://www.eecs.umich.edu/~mahlke/583w03/reading/cytron_toplas_91.pdf On Wed, Aug 31, 2011 at 2:06 AM, Teemu Rinta-aho <teemu.rinta-aho at nomadiclab.com> wrote: > On 30.8.2011...

...entrance/exit nodes. LLVM functions always have a single entry node (the first BB in the function) and multiple exits are handled specially. -Chris > Regards, > Ryan > > > * "Efficiently Computing Static Single Assignment Form and the Control > Dependence Graph" by Cytron, Ferrante, Rosen, Wegman, and Zadeck > > -Chris -- http://nondot.org/sabre/ http://llvm.org/

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:

On 30.8.2011, at 19.19, Eli Friedman wrote: > reg2mem won't do quite this transformation... not sure exactly what you need. I need to get rid of phis. This code is compiled from C++ and for some functions there are no phis, but multiple call instructions. I am targeting hardware in the end, and the next tool reading the IR does not like phis when it's generating VHDL. My questions may

...jan algorithm: Ah, i was referring to the *dominance frontier* computation, not the dominator computation. If you look, you'll see there is an algorithm in the paper that computes dominance frontiers touching only the nodes that are *actually in* the dominance frontier :) The algorithm in the cytron/et al paper looks like this: for each X in a bottom-up traversal of the dominator tree do DF(X) = empty for each Y in Successors(X) if (idom(Y) != X) then DF(X) += Y for each Z in DomChildren(X) for each Y in DF(Z) if (idom(Y) != X then DF(X) += Y You can see that this does more...

...https://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc > <https://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc> > > <https://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc > <https://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc>> > > -- Cytronics & Melware Weinbergstrasse 39, 55296 Loerzweiler / Germany Tel: +49 6138 99998-100 Fax: +49 6138 99998-109 VoIP: sip:info at melware.net mailto:info at melware.de http://www.melware.de

Hi, Diego, Thanks for your quick reply. Inserting a copy instruction may not work here because I have a limitation of virtual register number. I need to assign registers with ssa form to registers without ssa form. I will look the source code you point out. Thanks Xiangyang On Fri, Apr 24, 2015 at 4:19 PM, Diego Novillo <dnovillo at google.com> wrote: > > > On Fri, Apr 24, 2015

...are printed. - set dnid on incoming call. - catch errors in wrong dialstring. - set correct DIALSTATUS and HANGUPCAUSE. - set PROGRESS and PROCEEDING when the network signals them. - increased voice send buffer a little bit. - fixed seg-fault when unallocated number was dialed. Have fun Armin -- Cytronics & Melware Weinbergstrasse 39 55296 Loerzweiler / Germany Tel: +49 6138 98110-0 Fax: +49 6138 98110-9 mailto:info@melware.de http://www.melware.de

...o the live-variable analysis that you have implemented in the backends? At Argonne one of the application specific analyses we need to perform, activity analysis, has a forward and backward dataflow analysis component. Thanks, Michelle @inproceedings{Choi91, Author = {Jong-Deok Choi and Ron Cytron and Jeanne Ferrante}, Booktitle = {Proceedings of the 18th ACM SIGPLAN-SIGACT symposium on Principles of programming languages}, Location = {Orlando, Florida, United States}, Pages = {55--66}, Publisher = {ACM Press}, Title = {Automatic construction of sparse data flow evaluation graphs}, Ye...

...cross basic blocks, and there are no PHI nodes in the C frontend output (making the C frontend easier to implement). Later, the LLVM optimizer promotes all of these memory references to SSA values, using well known optimization techniques. In particular, the mem2reg pass implements the well known Cytron et al SSA construction algorithm. The advantage of this is that there is only _one_ representation for code throughout the optimizer, so alias analyses can be run whenever they want to be (though they are obviously most effective after the gross inefficiencies have been eliminated from the code)....

...ass is finished, run the mem2reg pass; it will convert your alloca'ed variables into SSA virtual registers and insert phi-nodes for you. As an aside, knowing how the SSA construction algorithm works is what led me to understand how to visit defs before uses in LLVM IR. I recommend reading Cytron et. al.'s paper (http://portal.acm.org/citation.cfm?id=115320). -- John T. On 5/4/11 6:16 PM, Chuck Zhao wrote: > While working on my optimization pass (a Function Pass), I try to > replicate a call instruction and insert it at some earlier location > (similar to LICM). > Howe...

...an/listinfo/tinc > > <https://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc> > > > <https://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc > > <https://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc>> > > > > > > > -- > Cytronics & Melware > Weinbergstrasse 39, 55296 Loerzweiler / Germany > Tel: +49 6138 99998-100 > Fax: +49 6138 99998-109 > VoIP: sip:info at melware.net > mailto:info at melware.de > http://www.melware.de > -------------- next part -------------- An HTML attachment was scrubbed.....

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

While working on my optimization pass (a Function Pass), I try to replicate a call instruction and insert it at some earlier location (similar to LICM). However, the instruction I am trying to replicate has dependencies on an uncertain number of instructions that are used to generate an address. A simple example (IR segment): define void @foo() nounwind { entry: %a = alloca i32, align 4;