similar to: [LLVMdev] intrinsic

> Here is my problem: > what does instrinsic / intrinsic function really means? You probably need to look at http://llvm.org/docs/ExtendingLLVM.html. Simply put, when you want to extend LLVM IR, say adding a new LLVM instruction, you have better try to add a intrinsic function [1] which has the same effect as the instruction you want to add. I don't think they are the same

There are a few instrinsic functions I would like to remove, is this possible? For example, the llvm.lifetime and llvm.dbg instrinsics? You can't simply iterate over the funciton and remove the call instructions, this causes issues. Is there a known structured way of doing this? -------------- next part -------------- An HTML attachment was scrubbed... URL:

> why in order to add this particular instruction (sum elements in a vector) I need to add an insrinsic? Adding intrinsic is not the only way, it is one of the way and user WILL-NOT be required to invoke It specifically. Currently LLVM does not have any instruction to directly represent “sum of elements in a vector” and generate your particular instruction.However, you can do it without

My target has an instruction that adds up all elements in the vector and stores the result in a register. I'm trying to implement it in my compiler but I'm not sure even where to start. I did look at other targets, but they don't seem to have anything like it ( I could be wrong. My experience with LLVM is limited, so if I missed it, I'd appreciate if someone could point it out ).

This would be really cool. We have several instructions that perform horizontal vector operations, and have to use built-ins to select them as there is no easy way of expressing them in a TD file. Some like SUM for a ‘v4i32’ are easy enough to express with a pattern fragment, SUM ‘v8i16’ takes TableGen a long time to compute, but SUM ‘v16i8’ resulted in TableGen disappearing into itself for

I'm a little confused. Here is why. I was able to add a vector add instruction to my target without using any intrinsics and without adding any new instructions to LLVM. So here is my question: how come I managed to add a new vector instruction without adding an intrinsic and why in order to add this particular instruction (sum elements in a vector) I need to add an insrinsic? Another

I'm starting to think we should directly implement horizontal operations on vector types. My suspicion is that coming up with a nice model for this would help us a lot with things like: - Idiom recognition of reduction patterns that use horizontal arithmetic - Ability to use horizontal operations in SLPVectorizer - Significantly easier cost modeling of vectorizing loops with reductions in

Hi, I am newbie for LLVM. I need some help, I want to disassemble ARM binaries and perform some operation on LLVM IR and again back to generate ARM binary from modified ARM LLVM IR. How I can proceed for the same. Any tool or document will be highly appreciated. Thanks and Regards, Deep -------------- next part -------------- An HTML attachment was scrubbed... URL:

Hi all, I need to use annotate inside the C++ code and want to know why doesn't it work? How can I modify my sources to use annotate inside the C++ code too? Thanks in advance. Sincerely, Hripsime. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120222/21e75ec8/attachment.html>

Hi, Is decompilation possible in general to the SSA form for binaries? I assume one has to make certain assumptions about code in general to get tools like these to work. For example if code like with dlsym or jit heap allocated functions can be incorporated at runtime it would seem that in general it is quite difficult to ascertain the boundaries of a basic block and insert the correct phi

hi, i found the term "intrinsic" in some LLVM docs i am reading, and nowhere explains what that means. i did try to google, but nothing helpful came up. anybody please help? many thanks, Jun

> On Thu, Mar 12, 2015 at 05:44:02PM -0700, Daniel Dilts wrote: >> Does there exist a tool that could lift a binary (assembly for some >> supported target) to LLVM IR? If there isn't, does this seem like >> something that would be feasible? There's plenty of variations on the idea: Revgen/S2E, Fracture, Dagger (my own), libcpu, several closed-source ones used by

Hi, LLVM is used to have an llvm.x86.and_ps instrinsic for the ANDPS instruction, but it seems to be gone, and it is a bit hard to synthetize it from vector instructions, since 'and' only works on vectors of integer types. Would a patch be accepted which adds this and related instructions back ? Zoltan -------------- next part -------------- An HTML attachment was

I want to write a simple backend-specific instrinsic that will just call an instruction. How should I do that? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180924/7faeeb3d/attachment.html>

Hi, I want to implement a new intrinsic in llvm that will denote a parallel section within a function. I followed the documentation for extending llvm (http://llvm.org/docs/ExtendingLLVM.html) but there is something about the working mechanism that is not clear for me. 1. Why do we have to add support for the C backend? Is this only necessary to transform the llvm assembly (bytecode) into C code

Dear Developers, I compiled a OpenCL kernel before (on Nov. last year) like __kernel void g(__global float* array) { array[get_global_id(0)] = 1; } with libclc, which would originally use the instrinsics like llvm.r600.read.local.size.x(). I executed the generated object file with one version of the hsa-runtime [1] provided by Mr. Stellard, when there was more than one workgroup, the output

Hi all, I'm working on a language in which I would like all operations to be well defined. (and efficient) I want to define a sqrt function in my language, that will return NaN for arguments < 0, and NaN for a NaN argument. As far as I know, these semantics map nicely to the SQRTPS SSE instruction, which seems to return NaN on arguments < 0. However, the LLVM lang ref states

On 3/12/15 8:14 PM, Daniel Dilts wrote: > On Thu, Mar 12, 2015 at 6:33 PM, Ahmed Bougacha > <ahmed.bougacha at gmail.com <mailto:ahmed.bougacha at gmail.com>> wrote: > > > On Thu, Mar 12, 2015 at 05:44:02PM -0700, Daniel Dilts wrote: > >> Does there exist a tool that could lift a binary (assembly for some > >> supported target) to LLVM IR?

Hello again, I really need to know how to make llvm understand the annotate in C++ code or to write a new Intrinsic by myself. I tried to add a new Intrinsic corresponding to the ExtendingLLVM doc instructions, but it is too opaque and I faild. Please, advise me if you can. Sincerely, Hripsime. On Wed, Feb 22, 2012 at 6:35 PM, Hripsime Matevosyan <hripsime.m at gmail.com>wrote: > Hi

Hello; I was planning to add a new instruction to the LLVM IR (and later to MIPS backend) for TLS(Thread level speculation) support. For this I tried to follow the steps described in http://llvm.org/docs/ExtendingLLVM dot html#instruction. But I could not find any llvm/lib/AsmParser/Lexer.l and llvm/lib/AsmParser/llvmAsmParser.y file in both the svn repository and the source code downloaded