similar to: How to inline function from other file in IR

Hi Soham, Are you intending to use the inline keyword in order to control the inlining optimization? The inline keyword is not doing this, it is changing the linkage type of the symbol and instruct the compiler to discard it if there is no call left, and also will instruct the linker to deduplicate. For instance if multiple file include a header that defines an inline function, this function

Hi Soham, “extern inline” keyword will help in this case, with this keyword compiler is forced to keeps the definition of the function and make it available for the external usage. Also it retains the “inlinehint” attribute on the function, with that lto inliner may make it inline. Best, Ashutosh From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of Mehdi AMINI via llvm-dev

It does, when the function has a body. When it doesn't, it ignores <https://godbolt.org/g/2BCvht>. The body might be provided later on in the toolchain via linking a library. Regards, Soham Sinha PhD Student, Department of Computer Science Boston University On Tue, Jun 26, 2018 at 10:25 AM Hans Wennborg <hans at chromium.org> wrote: > It works for me: > >

For the same reason GCC allowed the attribute. Even if I want to use/inline a function later on in the pipeline. Regards, Soham Sinha PhD Student, Department of Computer Science Boston University On Tue, Jun 26, 2018 at 8:30 AM mayuyu.io <admin at mayuyu.io> wrote: > Out of curiosity, how does an unused declaration affect the emitted object > file > > Zhang > > > 在

clang doesn't seem to respect __attribute__((used)) in C functions. Even if I declare a function like the following: __attribute__((used)) void function(), then also it doesn't declare the function in its IR file if I don't use the function. Is there any other way to force the declaration of "unused" function declarations with clang. I have hacked in clang 6.0.0 in

> > Date: Mon, 14 May 2018 14:26:13 -0400 > From: Kenneth Adam Miller via llvm-dev <llvm-dev at lists.llvm.org> > To: llvm-dev <llvm-dev at lists.llvm.org> > Subject: [llvm-dev] Andresen Algorithm > Message-ID: > <CAK7rcp_yXA79UuLvcD6LPMQBvi9tTpOGAcuWZ > Ux1tFKTyvuh2Q at mail.gmail.com> > Content-Type: text/plain; charset="utf-8" >

Hello, LLVM MC blog post <http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html> explains fairly well how the backend MC project is working. However, it's not clear to me how LLVM converts an assembly file (.s) to an object file. The driver --verbose option is not giving me much information as well. I want to know the flow. Like, What CodeGen phases does this file pass through? Is

Hello, I want to add assembly instructions at certain points in a function. This is X86 specific. So I am working in the lib/Target/X86 folder. I create a `MachineFunctionPass` in that folder. I register it in the X86TargetMachine.cpp in addPreEmitPass(). I use BuildMI to insert my own assembly instructions in the MachineFunctionPass. This works and my assembly instructions are inserted at

Hi Eli, I have tried that: static void registerMyPass(const PassManagerBuilder &, llvm::legacy::PassManagerBase &PM) { PM.add(new MyPass()); } static RegisterStandardPasses RegisterMyPass(PassManagerBuilder::EP_OptimizerLast, registerMyPass); It still couldn't find my pass. Regards, Soham Sinha PhD Student,

Actually I figured out that it is: opt -cfl-anders-aa *.ll But now I noticed that I need the graph that it computes, and it doesn't seem to emit that. On Wed, May 16, 2018 at 5:19 PM, Kenneth Adam Miller < kennethadammiller at gmail.com> wrote: > Is there a particular way to run a specific alias analysis that is already > implemented on a .ll file produced by clang -S

One place to look might be in the MachineOutliner target hooks in X86InstrInfo and AArch64InstrInfo. The MachineOutliner runs extremely late in the pass pipeline so it might be a good place to look for some inspiration. Of course, because this is *extremely late* it might not do *exactly* what you need. (e.g, this is post-register allocation, post frame-lowering, etc.) - Jessica > On May 4,

Hello, I have written a pass for the IR and I can run it with opt -load lib/LLVMMyPass.so -mypass -myarguments -S -o output.ll < output.bc I have registered my pass with the following code: static RegisterPass<MyPass> X("mypass", "MyPass Pass (with getAnalysisUsage implemented)"); How do I include the same pass in the clang driver. I tried running the pass: clang

Passing an assembly file to clang does not go through any CodeGen phases. It operates entirely in the MC layer. No MachineFunctions will be created. It just runs it through the MCAsmParser. Most of the setup for this is in clang's tools/driver/cc1as_main.cpp in the function ExecuteAssembler ~Craig On Thu, May 10, 2018 at 1:32 PM Soham Sinha via llvm-dev < llvm-dev at lists.llvm.org>

Hello Dean, I looked at the XRay Instrumentation. That's a nice engineering effort. I am sure you had your motivation to do this in CodeGen just like I wanted to do. I don't understand all of your code but I get the idea that you are adjusting the alignment with explicit bytes and no-op instructions. My problem is also very much related to yours where my stack pointer ($rsp) alignment

On Tue, May 8, 2018 at 4:06 AM Soham Sinha <soham1 at bu.edu> wrote: > Hello Dean, > I looked at the XRay Instrumentation. That's a nice engineering effort. I am sure you had your motivation to do this in CodeGen just like I wanted to do. I don't understand all of your code but I get the idea that you are adjusting the alignment with explicit bytes and no-op instructions. My

Is there a particular way to run a specific alias analysis that is already implemented on a .ll file produced by clang -S -emit-llvm? On Mon, May 14, 2018 at 7:36 PM, Soham Sinha via llvm-dev < llvm-dev at lists.llvm.org> wrote: > Date: Mon, 14 May 2018 14:26:13 -0400 >> From: Kenneth Adam Miller via llvm-dev <llvm-dev at lists.llvm.org> >> To: llvm-dev <llvm-dev at

Usually you need to add the -analyze option, to dump the analysis results. On Wed, May 16, 2018 at 9:09 PM, Kenneth Adam Miller via llvm-dev < llvm-dev at lists.llvm.org> wrote: > Actually I figured out that it is: > > opt -cfl-anders-aa *.ll > > But now I noticed that I need the graph that it computes, and it doesn't > seem to emit that. > > On Wed, May 16,

On Sun, May 6, 2018 at 7:26 AM Soham Sinha via llvm-dev < llvm-dev at lists.llvm.org> wrote: > Hello, > I want to add assembly instructions at certain points in a function. This is X86 specific. So I am working in the lib/Target/X86 folder. I create a `MachineFunctionPass` in that folder. I register it in the X86TargetMachine.cpp in addPreEmitPass(). I use BuildMI to insert my own

Hi Dean, I looked at XRay. I also thought on the similar line to add assembly instructions as auxiliary template code and jump on to there. However, that may still dis-align the stack. I have to think about it. But your XRay code does give me the courage to think about this seriously. Thank you for your help. I also figured out that we can access certain CodeGen's feature right from the IR

Got this error: Printing analysis 'Inclusion-Based CFL Alias Analysis': Pass::print not implemented for pass: 'Inclusion-Based CFL Alias Analysis'! On Thu, May 17, 2018 at 12:14 AM, Alexandre Isoard < alexandre.isoard at gmail.com> wrote: > Usually you need to add the -analyze option, to dump the analysis results. > > On Wed, May 16, 2018 at 9:09 PM, Kenneth Adam