similar to: [LLVMdev] Getting all Basic Blocks in a Loop

I can get the loop header block by using getAnalysis < LoopInfo > ( *F ).isLoopHeader( BB ) But is there any way with with you can also check the blocks containing backedge. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130220/198e4421/attachment.html>

Hi Hisham, Most likely the basic blocks are the headers of two different loops. Try running viewCFG() on the function in question to see if this is the case. Tom ----- Original Message ----- From: "Hisham Chowdhury" <hisham_chow at yahoo.com> To: llvmdev at cs.uiuc.edu Sent: Wednesday, June 16, 2010 7:22:00 PM GMT -05:00 US/Canada Eastern Subject: [LLVMdev] Loopinfo Analysis

> On 2015-Jun-04, at 12:45, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote: > >> On 2015-Jun-04, at 12:28, Ivan Baev <ibaev at codeaurora.org> wrote: >> >> Hi, we got the following assert: >> >> assert(!Working[0].isLoopHeader() && "entry block is a loop header"); >> >> [in

Hello, I have a question regrading the analysis pass that generates loop info from an .ll code. My previous understanding was there will be just one loop header(in the loop info) for a particular loop. But, when i use isLoopHeader() member function from the loop info class I get 'true' return value for two different basic blocks. Note both basic blocks are loop conditional block(break

In LLVM 1.5, the function isLoopHeader fails to check for a null pointer after calling getLoopFor. Dunno if this is fixed in CVS, but attaching a patch anyway ... Sameer. -- Research Scholar, KReSIT, IIT Bombay http://www.it.iitb.ac.in/~sameerds/ -------------- next part -------------- --- LoopInfo.h 2005-06-29 17:42:43.000000000 +0530 +++ llvm/include/llvm/Analysis/LoopInfo.h 2005-06-29

Hello, I'm having a little problem with passes that use LoopInfo. Their statistics aren't the same when I execute the same pass multiple times in the same program. After some investigation, I've found out that LoopInfo is the root of the problem. I wrote a little pass that counts the loop headers (number of basic blocks for which LoopInfo.isLoopHeader(BB) is true). I've picked

Hi, we got the following assert: assert(!Working[0].isLoopHeader() && "entry block is a loop header"); [in BlockFrequencyInfoImpl<BT>::tryToComputeMassInFunction(), BlockFrequencyInfoImpl.h] on a Hexagon target - the entry block is a loop header. Has someone seen this assert on other targets? What would be a preferable way to fix it: - extend BlockFrequency pass to

On 2/28/11 4:43 PM, Devang Patel wrote: > > On Feb 28, 2011, at 2:35 PM, Naznin Fauzia wrote: > >> Hi all, >> >> How Can I get the Loops around an Instruction? >> >> I know I can get the basic block of an instruction using >> inst.getParent() which returns a BasicBlock*. Now I want to use the >> getLoopFor(BasicBlock) method of the class

On Mon, Feb 28, 2011 at 6:04 PM, Naznin Fauzia <laboni14 at gmail.com> wrote: > Thanks Devang and John. My pass is actually a loop pass, not a function > pass. So, I couldnt override the getAnalysisUsage. > A LoopPass is no different from a FunctionPass here. You can use getAnalysisUsage and getAnalysis in a LoopPass. > I am in a loop pass, I know the outermost loop. Now How

Thanks Devang and John. My pass is actually a loop pass, not a function pass. So, I couldnt override the getAnalysisUsage. I am in a loop pass, I know the outermost loop. Now How can I get the loopInfo from here? I couldn't find helpful methods in the LoopInfo class documents. On Mon, Feb 28, 2011 at 5:52 PM, John Criswell <criswell at illinois.edu>wrote: > On 2/28/11 4:43 PM,

Thanks John, I modify my code to like this: bool XXX::ModulePass(Module &M){ .... LoopInfo &li = getAnalysis<LoopInfo>(fi); .... } Here fi is a Function* pointing to main(). Now when I run the pass, another error shows up: AnalysisType& llvm::Pass::getAnalysisID(const llvm::PassInfo*, llvm::Function&) [with AnalysisType = llvm::LoopInfo]: Assertion `ResultPass

Hi all, I tried to have a LoopInfo object in a function pass, and add addRequired in getAnalysisUsage, and then use getAnalysis in runOnFunction(). It worked OK. Now I want to have a module pass to traverse the functions, and similarly, I want to have to loop information of the functions. When I did the above in runOnModule, and build the module pass, the following error popped out, and the

On Feb 28, 2011, at 2:35 PM, Naznin Fauzia wrote: > Hi all, > > How Can I get the Loops around an Instruction? > > I know I can get the basic block of an instruction using inst.getParent() which returns a BasicBlock*. Now I want to use the getLoopFor(BasicBlock) method of the class LoopInfo. > But I dont know how to get the LoopInfo. > > BasicBlock* bb =

I think this assertion failure may be caused by the getAnalysisUsage(). Mine is like the following: class myclass : public ModulePass{ ... virtual void getAnalysisUsage(AnalysisUsage &AU) const { AU.addRequired<LoopInfo>(); } ... } Is it enough? Thanks! Best, --Wenbin ----- Original Message ----- From: Wenbin Zhang To: John Criswell Cc: llvmdev at

On Jul 22, 2010, at 2:05 PM, John Criswell wrote: > If you write your pass as a ModulePass, then you can iterate over the > functions in any order that you want. I had considered that, but my FunctionPass depends on other passes processing the functions first: void MyPass::getAnalysisUsage(AnalysisUsage &AU) const { AU.addRequired<UnifyFunctionExitNodes>();

Hi, I'm trying to use the function getAnalysis. This is the code I'm using : void getAnalysisUsage(AnalysisUsage &AU) const { AU.addRequired<LoopInfo>(); AU.setPreservesAll(); } virtual bool runOnModule(Module &M) { LoopInfo &LI = getAnalysis<LoopInfo>(); } I get following error when I try to run my pass : opt:

nitisha warkari wrote: > Hi, > > I'm trying to use the function getAnalysis. This is the code I'm using : > > void getAnalysisUsage(AnalysisUsage &AU) const { > AU.addRequired<LoopInfo>(); > AU.setPreservesAll(); > } > > virtual bool runOnModule(Module &M) { > LoopInfo &LI = getAnalysis<LoopInfo>(); > >

Hello, I was trying to get the loop info in a module pass to be able to iterate over the loops int the module itself. Since my pass requires to make module level changes including adding new types to module hence a looppass cannot be used here. I am getting the following error on running opt. opt: /root/llvm-2.4/include/llvm/PassAnalysisSupport.h:199: AnalysisType&

Interesting that we're getting a relative flood of these recently. See here: http://lists.llvm.org/pipermail/llvm-dev/2019-March/131346.html I don't think one can reliably get a Function analysis pass from within a ModulePass using the legacy pass manager. You have to manually construct the pass yourself. -David Jonathan Smith via llvm-dev <llvm-dev at

Hello, I am trying to write a new ModulePass using LoopInfo analysis result, but it seems I misunderstand some concept about PassManager. Basically I want to keep LoopInfo analysis result alive. Here is an example showing the problem I encountered, assuming I already addRequired<llvm::LoopInfo>() in getAnalysisUsage: void foo(llvm::Function *F1, llvm::Function *F2) { llvm::LoopInfo