similar to: [LLVMdev] Questions on writing a pass that adds instrumentation code

Hi, I'm trying to instrument llvm bytecodes using opt. I performed the following commands: llvm-gcc -g -emit-llvm test.c -c -o test.bc opt -insert-edge-profiling test.bc -o output.bc llc output.bc -o output.s gcc output.s -o test.out However, it can't find symbol llvm_start_edge_profiling. /tmp/ccw7GH4c.o: In function `main': /home/raul/LLVM/tests//test.c:8: undefined reference

Hi, I am new to LLVM, and would like to write a dynamic profiler, say which prints out the load address of all the load instructions encountered in a program. >From what I could pick up, edge-profiler.cpp increments a counter dynamically which is somehow dumped onto llvmprof.out by profile.pl Could anyone explain me how this works? Can I instrument the code to dump out the load addresses or

Hi Alastair, Thank you so much for the information on the tools. Actually, I need to analyze which sections of code are prone to misses and mis predicts, and would have to eventually instrument the code. I was able to instrument and call an external function, but faced an issue while passing an argument to the function. I am following EdgeProfiling.cpp but couldn't figure out the problem.

Hi Fellows, Is there a way to allocate dynamic array within an LLVM IR file from my code generator? Say., how to create an array type with a size determined through a global variable. Symbolically, something like below: Value *sz = Mod->getOrInsertGlobal("SIZE", Int32Ty); Type *ArrayTy = ArrayType::get(FloatTy, sz)

Hi Silky, On 14/01/13 01:47, Silky Arora wrote: > I need to profile the code for branches (branch mis predicts > simulation), load/store instructions (for cache hits/miss rate), and a > couple of other things and therefore, would need to instrument the code. > However, I would like to know if writing the output to a file would > increase the execution time, or is it the profiling

Hi, @Alastair: Thanks a bunch for explaining this so well. I was able to write a simple profiler, and run it. I need to profile the code for branches (branch mis predicts simulation), load/store instructions (for cache hits/miss rate), and a couple of other things and therefore, would need to instrument the code. However, I would like to know if writing the output to a file would increase the

The docs are pretty vague about this. After digging into the examples I got the following to work with JIT to gain a pointer to variable elsewhere in the runtime, but I'd like to understand what is going on here, and if there is a, um, nicer API that I'm missing? llvm::Value* C::getGlobalVariable(const char* name, llvm::Type* t) {

Hi, Could anyone tell me how exactly can one convert a .bc file (bitcode file) to an executable in the native program. I was trying an instrumentation transform with the following workflow opt -insert-edge-profiling input.bc -o output.bc and then try and execute output.bc using lli output.bc however the program gives the following error : Program used external function

On Oct 20, 2009, at 5:49 AM, Jay Foad wrote: >> To test clang: >> 1) Compile llvm and clang from source. > > LLVM fails to build for me on Cygwin. I get: > Does TOT build? If not, please file a bug. Unfortunately Cygwin is not in our release criteria. I'd like to have a buildbot running (if there is not one already) and then get someone to qualify it for the

> To test clang: > 1) Compile llvm and clang from source. LLVM fails to build for me on Cygwin. I get: make[1]: Entering directory `/home/foad/llvm/objdir-2.6/runtime' make[2]: Entering directory `/home/foad/llvm/objdir-2.6/runtime/libprofile' llvm[2]: Compiling BasicBlockTracing.c for Release build (PIC) llvm[2]: Compiling BlockProfiling.c for Release build (PIC) llvm[2]:

On Tue, Oct 6, 2009 at 5:49 PM, Reid Kleckner <rnk at mit.edu> wrote: >> Also, the null pointer is coming from a call to JCE->allocateSpace(). >> This is a virtual function; I'm trying to discover what subclass it >> is. > > So, there's JITEmitter::allocateSpace which overrides > JITCodeEmitter::allocateSpace(), but *most* of the time it just calls >

Hello, I am trying to create IR block for making a call to function pointer. For creating the IR for a function call to "foo", with "foo" being defined as "void foo(int)", I can use the "getOrInsertFunction" call from Module class as follows: std::vector<Type*> FooArgs; FooArgs.push_back(IRB.getInt64Ty()); Value *FooFunction =

Hi, > llvm-gcc -g -emit-llvm test.c -c -o test.bc > opt -insert-edge-profiling test.bc -o output.bc > llc output.bc -o output.s > gcc output.s -o test.out > > However, it can't find symbol llvm_start_edge_profiling. -insert-edge-profiling inserts call to the llvm_start_edge_profiling function which is a part of a profiling runtime library. This library must be linked

Alright, I'm ready to nuke it. Last chance to say stop. For context of others, this has come up repeatedly: no one we know of is using EdgeProfiling.cpp, PathProfiling.cpp, and the lib/Analysis/Profile*Pass.cpp collection of tools. They haven't been updated since 2012 when Alastair Murray looked into this stuff, and both current efforts towards PGO are essentially *totally* different

On Oct 20, 2009, at 12:05 PM, Aaron Gray wrote: > 2009/10/20 Tanya Lattner <lattner at apple.com>: >> >> On Oct 20, 2009, at 5:49 AM, Jay Foad wrote: >> >>>> To test clang: >>>> 1) Compile llvm and clang from source. >>> >>> LLVM fails to build for me on Cygwin. I get: >>> >> >> Does TOT build? If not,

2009/10/20 Tanya Lattner <lattner at apple.com>: > > On Oct 20, 2009, at 5:49 AM, Jay Foad wrote: > >>> To test clang: >>> 1) Compile llvm and clang from source. >> >> LLVM fails to build for me on Cygwin. I get: >> > > Does TOT build? If not, please file a bug. No. Theres the runtime install bug (below), and llvm-gcc has a bug that I

Chandler Carruth wrote: >Alright, I'm ready to nuke it. Last chance to say stop. Stop. >For context of others, this has come up repeatedly: no one we know of is >using EdgeProfiling.cpp, PathProfiling.cpp, and the >lib/Analysis/Profile*Pass.cpp collection of tools. We've been actively using it since at least 2.8. True, we haven't been vocal about it. While I can see

R Users - Tomorrow night, we are leading a group of R programmers to a site called Stack Overflow, Stackoverflow is a collaborative question and answer site for programmers, currently lacks much R content. to populate some of the most oft-asked and reluctantly-answered questions about R. The R-help mailing list is an indispensable resource to members of the R community. Perhaps owing to its

Thanks for your reply. May I know which is the recommended library that should be linked against? I am currently linking libprofile_rt.a. And I have noticed the differences that, if we do `nm libprofile_rt.a | grep llvm` with my old copy of the llvm/clang installation, I can see 00000000000005e0 T _llvm_gcda_emit_arcs 0000000000000b48 S _llvm_gcda_emit_arcs.eh 0000000000000430 T

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