similar to: [LLVMdev] -loop-extract question

---------- Forwarded message ---------- From: Ryan Taylor <ryta1203 at gmail.com> Date: Thu, Jan 12, 2012 at 12:22 PM Subject: Re: [LLVMdev] Extract Loop Failing To: Cameron Zwarich <zwarich at apple.com> I'm not sure it's a bug. If I don't know if I am properly using it then how would I know it's a bug and not simply a user issue? If it sounds like a bug to you then

How do you expect people to be able to tell you if you are using it properly if they can't see how you are using it? Cameron On Jan 12, 2012, at 12:22 PM, Ryan Taylor wrote: > I'm not sure it's a bug. If I don't know if I am properly using it then how would I know it's a bug and not simply a user issue? If it sounds like a bug to you then I will file it. :) > > On

It looks like this problem only exists on nested loops, ideas? On Thu, Jan 12, 2012 at 11:44 AM, Ryan Taylor <ryta1203 at gmail.com> wrote: > Is it not a good idea to try and extract loops that have multiple exits? > > > On Thu, Jan 12, 2012 at 10:44 AM, Ryan Taylor <ryta1203 at gmail.com> wrote: > >> I am trying to use ExtractLoop() but I am getting segFaults:

Is it not a good idea to try and extract loops that have multiple exits? On Thu, Jan 12, 2012 at 10:44 AM, Ryan Taylor <ryta1203 at gmail.com> wrote: > I am trying to use ExtractLoop() but I am getting segFaults: > > 0 opt 0x00000000008edc2f > 1 opt 0x00000000008edfda > 2 libpthread.so.0 0x00007ffe21203c60 > 3 opt 0x0000000000895ed9

I am trying to use ExtractLoop() but I am getting segFaults: 0 opt 0x00000000008edc2f 1 opt 0x00000000008edfda 2 libpthread.so.0 0x00007ffe21203c60 3 opt 0x0000000000895ed9 llvm::Value::getName() const + 9 4 LLVMEXITCDFG.so 0x00007ffe202b80d7 5 opt 0x00000000006fc6e7 llvm::LPPassManager::runOnFunction(llvm::Function&) + 1143 6 opt

Hi, I've seen this question asked before but I haven't seen an answer.. I would like to extract the body of a (for) loop into a new function so I can do some transformations. The function ExtractCodeRegion seemed like a good candidate and I've got it to sort of work. My problem is that ExtractCodeRegion creates a function that still contains a loop. I was able to eliminate the loop

Thanks for the info. Curious, do you know if there is an opt that will put all loops, including nested ones, in functions (ie each loop in it's own function)? What I'm trying to do is create a way for each loop to have only one exit. I want all loops to be single exit loops? I can write my own pass but I'd rather not. I think that if I can put each loop into it's own function

Hello- I need to loop through a directory of files to extract data corresponding to dates in a dataframe. Within a function, I've written nested loops to index the dataframe dates, and the directory files. My function successfully extracts the data corresponding to my first data frame date, but stops there and doesn't continue through my entire list of data frame dates and directory

In addition to the link below, please check for functions like "llvm.debug.declare", "llvm.debug.value", as you will not get LoopInfo for these.   Pankaj   ________________________________ From: Devang Patel <dpatel at apple.com> To: Ryan Taylor <ryta1203 at gmail.com> Cc: llvmdev at cs.uiuc.edu Sent: Wednesday, November 30, 2011 11:08 PM Subject: Re: [LLVMdev]

On 24 October 2011 15:50, Ryan Taylor <ryta1203 at gmail.com> wrote: > Nick, > > Oh, sorry. So there are lots of "void" operations, I basically just want > to print out the operation name, it's dest operands and source operands, What's a dest operand? The term "operand" in LLVM always refers to the inputs (ie., an add has two operands). >

Hi Johannes, This is very helpful and thank you for the quick response. I imagine that the usual nested loop structure is something like: loop1_header_bb bbs_between_loop1_header_and_loop2_header loop2_header_bb loop_body_bbs br loop2_header_bb instructions_before_loop1_end_and_after_loop2_end br loop1_header_bb In this case you mean that loop2_header_bb might need to be split before

Here is the code snippet that I am using to create the PHIs in the loop according to the PHIs in the new preheader. At this point I have already redirected the loop backedge and removed the preheader from the loop. for (BasicBlock::iterator II = loopHeaderBB->begin(); (PN=dyn_cast<PHINode>(II)); ++II) { // remove loop back PHI and add it to split BB

I guess I thought that once I redirected the branches and created new PHIs that LLVM would correct the variable usage when I return true (changed CFG) from the pass. Is this not the case? On Wed, Mar 7, 2012 at 4:08 PM, Ryan Taylor <ryta1203 at gmail.com> wrote: > Here is the code snippet that I am using to create the PHIs in the loop > according to the PHIs in the new preheader. At

Sorry! It worked with ExtractBasicBlock() ----- Original Message ----- From: "Mrunal J Shah" <mrunal.shah at gatech.edu> To: "llvmdev" <llvmdev at cs.uiuc.edu> Sent: Saturday, December 6, 2008 8:30:33 PM GMT -05:00 US/Canada Eastern Subject: [LLVMdev] How to extract loop body into a new function? Hi All, I am having trouble extracting loop body into a new

False Alarm!! Still don't know how to do it! I am trying to write a transformation pass to extract a loop body into a function. For example: The Loop in question is: for (i2 = 0; i2 < LOOP_SIZE; i2++) { A[B[i2]] = 2 * B[i2]; } The IR for which is: bb13: ; preds = %bb13, %bb %i2.0.reg2mem.0 = phi i32 [ 0, %bb ], [ %indvar.next62, %bb13 ] ; <i32>

[please remember to cc llvmdev] On 24 October 2011 13:20, Ryan Taylor <ryta1203 at gmail.com> wrote: > Nick, > > Thanks, this is not really viable as I'd have to check every single > instruction like this, seems like there is a lot of overhead associated with > this solution. I don't know what problem you're solving? Nick On Mon, Oct 24, 2011 at 11:48 AM,

I would have thought this would have been possible. On Thu, Nov 17, 2011 at 3:49 PM, Ryan Taylor <ryta1203 at gmail.com> wrote: > So is this simply not possible? > > > On Thu, Nov 17, 2011 at 10:31 AM, Ryan Taylor <ryta1203 at gmail.com> wrote: > >> Nick, >> >> Thanks for this info, though this didn't help my problem at all. >> >>

Hi All, I am having trouble extracting loop body into a new function. The ExtractLoop() or ExtractBasicBlock() extracts the entire loop along with the header into a new function. All I want is to extract the body of the loop into a new function(without the header). Is this possible? Thanks, Mrunal

I am splitting a one BB loop into two BB. Basically, the one loop BB has 3 incoming values, one form back edge two from other edges. I want to extract the PHIs from the other two edges out into it's own BB and delete that from the loop, then redirect the backedge to the loopbody (non extracted portion) and create a new PHI coming from the extracted BB and the backedge. I can do this;

Is it possible to unroll a loop (forcibly if necessary) with llvm (possibly the -loop-unroll pass) a constant number of times. I believe that I read that the -unroll-count=x option was removed, correct? So is there some other way to do this or is this just not possible in llvm? -------------- next part -------------- An HTML attachment was scrubbed... URL: