similar to: how to get LoopInfo in FunctionPass in LLVM3.7.0

Hello, I have created a ModulePass, that now needs LoopInfo information. The ModulePass registration is taken from [1]. I use clang to directly invoke it (This is also a hard requirement, because I need the fancy output of clang warnings/remarks). The problem is, that the dependency to the LoopInfoWrapperPass does not seem to work. The error is: --- snip --- clang-4.0:

Hi LLVM community, I am writing a custom pass for analyzing the dependence information for the memory access within a loop. I found “LoopAccessLegacyAnalysis” class useful, however I m not able to obtain information from that pass. Here is what I did to get the information: // require pass virtual void getAnalysisUsage(AnalysisUsage &AU) const {

I'm seeing some very unexpected behavior in a ModulePass I've created. To support both the legacy and new pass managers, I've abstracted away the code to get the passes it depends on: bool MyPass::runOnModule(Module &M) override { auto DominatorGetter = [this] (Function &F) -> DominatorTree & { return

Have you check `LoopAccessLegacyAnalysis::runOnFunction` ran as you expect? Besides, I am not sure if `LoopAccessLegacyAnalysis::runOnFunction` does anything useful, have you check that, too? 2018-02-08 1:49 GMT+08:00 Kewen Meng via llvm-dev <llvm-dev at lists.llvm.org>: > Hi LLVM community, > > I am writing a custom pass for analyzing the dependence information for > the

Hi, I wrote tiny ModulePass which iterates over functions and then uses getAnalysis<LoopInfo> in order to get informations about the loop. It compiles smoothly, but whenever I try to run it I got error like this: opt: .. PassAnalysisSupport.h:203: AnalysisType& llvm::Pass::getAnalysisID(const llvm::PassInfo*) const [with AnalysisType = llvm::LoopInfo]: Assertion `ResultPass &&

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

On 3/9/12 4:10 PM, Fan Long wrote: > 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

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

Hello, I need to analyze dependencies in my llvm ir by using polly. i created a new pass called mypass there i added polly dependency analysis pass but when i execute this pass in gdb i get no data. Why is that so? My code is follows; namespace { struct mypass : public FunctionPass { static char ID; mypass() : FunctionPass(ID) { } virtual bool runOnFunction(Function &F) {

Thank you for your quick reply. Actually I am using a std::map to map Function* to LoopInfo*, but that does not help in this case. Each time I call getAnalysis<llvm::LoopInfo>(*F), it returns the same instance of llvm::LoopInfo, so the std::map is just mapping every function into the same instance. It seems only the analysis result for the last function is valid, because all the result for

On 08/12/2010 09:41 PM, Douglas do Couto Teixeira wrote: > Dear guys, > > I am having problems to obtain good information from the LoopInfo. > I am always getting a trip count of 0, even though I am clearly passing > a loop with a constant bound. I am using this pass below: Hi, I would propose to first check if the trip count is calculated correctly. I would do this with opt

On 3/9/12 4:28 PM, Fan Long wrote: > Thank you for your quick reply. > > Actually I am using a std::map to map Function* to LoopInfo*, but that > does not help in this case. Each time I call > getAnalysis<llvm::LoopInfo>(*F), it returns the same instance of > llvm::LoopInfo, so the std::map is just mapping every function into > the same instance. It seems only the

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

On Thu, Aug 12, 2010 at 5:22 PM, Tobias Grosser <grosser at fim.uni-passau.de>wrote: > On 08/12/2010 09:41 PM, Douglas do Couto Teixeira wrote: > >> Dear guys, >> >> I am having problems to obtain good information from the LoopInfo. >> I am always getting a trip count of 0, even though I am clearly passing >> a loop with a constant bound. I am using

I have modified the code as follows; now i am using both scopdetection and scopinformation before dependency check but i think link is missing... virtual bool runOnFunction(Function &F) { std::unique_ptr<ScopInfo> Result; std::unique_ptr<ScopDetection> Result2; //polly::ScopDetection pl; auto &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo(); auto

Hi, I want to find simple loops in LLVM bytecode, and extract the basic information of the loop. For example: for (i=0; i<1000; i++) sum += i; I want to extract the bound [0, 1000), the loop variable "i" and the loop body (sum += i). What should I do? I read the LLVM API document, and find some useful classes like "Loop", "LoopInfo". But I do

How do you compile the code? Within the Polly subdirectory using CMake? How do you run your pass. Using "opt -mypass inputfile.ll"? Michael 2018-01-28 9:30 GMT-06:00 hameeza ahmed via llvm-dev <llvm-dev at lists.llvm.org>: > Hello, > > I need to analyze dependencies in my llvm ir by using polly. i created a new > pass called mypass there i added polly dependency

HI Hameeza, what do mean by link is still missing? Currently it is not possible to use polyhedral information from within in-tree LLVM passes. This is because Polly is not currently part of the LLVM tree, and is only linked into the tools as an external project. I.e., you can't depend on Polly passes in an in-tree pass. What you can do, though, is use Polly from an out-of-tree context. If

Dear all, I write a new LoopPass which wants to use passes including LoopInfoWrapperPass, ScalarEvolutionWrapperPass and LoopAccessLegacyAnalysis. Therefore, I implement the following code based on LLVM 9.0.0: ===================================================================== bool LoopInformationCollect::runOnLoop(Loop *L, LPPassManager &) { auto &SE =

Hi Anastasiya, If it fits you use case, you can consider walking the loop header and calling getSCEV() on all of the PHI nodes in the header. This will give you a SCEV* which should be easier to analyze than manually inspecting PHI cycles. Thanks! -- Sanjoy On Tue, Jul 25, 2017 at 11:42 AM, Michael Kruse via llvm-dev <llvm-dev at lists.llvm.org> wrote: > 2017-07-25 19:32 GMT+02:00