similar to: Built in progmem variables in AVR

Hi All, For quite some time there's been a side project for developing an AVR back end for LLVM: http://sourceforge.net/projects/avr-llvm/ What is required from us to be able to add this work to the LLVM repo? And when do you think would be a good time for us to do that? If this is located somewhere in the docs and I've missed it, pointers would certainly be appreciated. Thanks, Eric

@Anitha The backend is on the stage of being able to compile any program independently of its complexity, atleast that is the theory, any failures should get fixed. The only missing C language feature/extension I know of now is inline asm, which is currently being worked on. It has support for varargs and variable sized allocas. The backend has support for 95% of the ISA, including all adressing

I think this is broken in at least one place when legalising the DAG. This llvm ir: %3 = call { i16, i1 } @llvm.umul.with.overflow.i16(i16 %2, i16 11) Fails to lower correctly on AVR but the problem is, unfortunately, not just coming from the AVR Target code and I am not sure it can be cleanly fixed just there. (But I would be very happy to be proved wrong as I'm very new to this.) The above

Thanks! The new are of xmega3 architecture, which is already included. So this should be simple. Where is the information about ISR-vector table, SRAM addresses and so on stored? -- Wilhelm Am 04.03.20 um 11:03 schrieb Dylan McKay: > Hey Wilhelm, > > This should be possible by editing the 'AVRDevices.td' [1]TableGen > definitions to add an entry for the newer chip types.

Hey all, The AVR backend has now finally been merged in-tree completely. Thanks to Krzysztof and Matt for all of their hard work reviewing patches <https://reviews.llvm.org/differential/query/AuHaJ3SXjDmO> Development will now halt on the downstream repository (on GitHub <https://github.com/avr-llvm/llvm>), and it will now be done LLVM proper. This is good news, especially for the

Am 04.03.20 um 11:16 schrieb Dylan McKay: > > The new are of xmega3 architecture, which is already included. So this > should be simple. > > Where is the information about ISR-vector table, SRAM addresses and so > on stored? > > > At the moment, this is not implemented in LLVM; these details are left > to the frontend. Clang/compiler-rt does not

Thank you for both of your input. Yes, I try to cross-compile for AVR, the simple ATMEGA328P used in every Arduino Uno. My main motivation being that I hope to be able to use a couple of STL containers, <functional> and <type_traits> on the MCU. Not sure though if this can be reached by going via the clang route. Getting back to the compilation: when I run clang with both both

Hi, I’ve come back and updated my llvm toolset with modern code (my branch was about 1-2 years old) and now the llvm IR files produced by my front end no longer compile with llc. Here is a sample of llvm ir produced by my front end (it’s a standard version 3.1 build of swift from the swift.org open source website). ; ModuleID = 'main.ll' source_filename = "main.ll" target

That’s useful info, thanks. I think it will be useful for me to understand the connection, why this type of pointer is being emitted now. Do you have any suggestions where i can look to find the platform specific code that is making function pointers go into addrspace? Carl p.s. I am also working on passing the avr target flag to swift, but swift itself had (has?) limitations that make it

Hey Wilhelm, Could you post the LLVM IR generated from your C++ file? This can be achieved with 'clang -S -emit-llvm' Cheers On Sat, Mar 28, 2020 at 6:36 PM Wilhelm Meier <wilhelm.meier at hs-kl.de> wrote: > Answering partly to myself there was a extern "C" missing. > > But the register pushes ans reti are still missing. > > Whats wrong? > > Am

Cool. That explains a lot! Sorry if this is a total n00b question, but… how does the datalayout string get overridden? in llvm/lib/Target/AVR/AVRTargetMachine.cpp I can see the code that determines the default datalayout for AVR… static const char *AVRDataLayout = "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8”; However in the LLVM iR below, the target datalayout was present and

I'm beginning to use the AVR backend. I ran into the problem, that newer (tiny1, mega0) µC as a tiny1614 are not supported. How do I add these to the AVR backend? Thanks!

> On Feb 3, 2017, at 12:45 PM, Dylan McKay via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > The builder isn’t marked as experimental so I think the expectation is that people keep it green and contact the bot owner if they need help figuring out why their change makes it red. That said, it sounds a bit odd to have a non-experimental builder for an experimental backend. >

The reason the ones in PPCInstrInfo.td don't have the patterns to match is the reason they are more analogous to your problem. Namely, tblgen does not have a way to produce nodes with more than one result. The load-with-update instructions do exactly that - one of the inputs is also an output, but the other output is independent (and necessarily a separate register). The FMA variants have

How is the llvm-avr backend integration going ? Will it be functional ( experimental ) in the 3.8 release ? Will Clang recognize options for avr ? thanks. Allen -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20151218/be23dc42/attachment.html>

Am 04.03.20 um 13:28 schrieb Dylan McKay: > > * *The C/C++ function needs to be declared with either the calling > convention avr-interrupt or avr-non-blocking-interrupt.* Skipping > this step will cause regular ret instructions to be emitted for > return-from-subroutine, instead of the required reti for interrupt > handlers. ISRs also have stricter

> On Feb 3, 2017, at 4:18 AM, Tobias Grosser via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > On Fri, Feb 3, 2017, at 11:37 AM, Dylan McKay via llvm-dev wrote: >> Hey all, >> >> Every few weeks, a change is committed to trunk that breaks the AVR >> buildbot. >> >> A problem presents when commit authors do not fix the build, and just

To those interested in AVR backend additions to LLVM, the LLVM review tools "Phabricator" ( don't ask me to say that 3 times fast ), allows easy searching. Go to http://reviews.llvm.org/ and type in AVR in the search entry. This will give you a list of the commits, and resolutions. From my understanding ( NO Expert ), a large part of the skeleton code has been added. The leave

Hi, There was a thread a few days ago about the expectations for experimental targets. At the moment, the only experimental target is AVR. It's been in the tree for a long time now, and generally seems well-behaved. Should we just make it a normal target? Nico -------------- next part -------------- An HTML attachment was scrubbed... URL:

Hello all, I have submitted and merged patches for most of the public modifications required for the AVR backend, and I am amount to start the process of adding the lib/Target/AVR directory piece by piece. As this will be a significant portion of code (~7000 lines), it should have a code owner. I have been working on the backend for the last year, maintaining it, overseeing contributions, and