I'm working on verifying some Rust code using SAW. SAW requires that you compile to LLVM bitcode, which you can then import and verify. I know you can generate bitcode using the --emit=llvm-bc flag...

How to determine all global variables of a LLVM module? I want to modify them using a module pass.

I am trying to understand the LLVM IR generated from a C++ program int add(int *x); int func() { int T; T=25; return add(&T); } The generated IR is: define i32 @_Z4funcv() local_unnamed...

I am trying to add my llvm pass into Rustc. Rustc has one compiling option -C passes=val where we could add extra LLVM passes to run. However, as my try, this option can only accept the pass when t...

I'm generating LLVM IR for JIT purposes, and I notice that LLVM's calling conventions don't seem to match the C calling conventions when aggregate values are involved. For instance, when I declare ...

mem2reg is an important optimization pass in llvm. I want to understand how this optimization works but didn't find good articles, books, tutorials and similar. I found these two links: broken or ...

I would like to step through some LLVM IR code I have generated. The code is syntactically and type valid as far as the llc and lli are concerned, but the results are not what I expected. The chu...

LLVM has phi instruction with quite weird explanation: The 'phi' instruction is used to implement the φ node in the SSA graph representing the function. Typically it is used to implement branchin...

Here is a quick question on analyzing LLVM IR. So basically I am trying to fetch the return value of the LLVM IR function call statement, something like this: %47 = call i256 @test(i256 %46) I w...

I want to copy these set of instructions from one part and paste to that in another part in IR %0 = load i32, i32* @x, align 4 %1 = load i32, i32* @y, align 4 %add = add nsw i32 %0, %1 %2 = lo...

I build a simple application: hello.c #include <stdio.h> void foo(int x) { printf("%d", x); } int main() { printf("Hello\n"); foo(6+5); return 0; } With an LLVM IR...

I would really like to use swift for embedded programming as I feel like its a much better replacement for c++, The processor I'm using is an ARM Cortex-M4F(http://www.ti.com/tool/ek-tm4c123gxl). L...

I have read some webpages and articles about llvm and I am quite interested in this project. (Maybe to learn something about compiler writing without the need to struggle with the complicated point...

I am looking for a right way to get a next immediate instruction that follows a given instruction. Let's assume that I have the following: %10 = icmp slt i32 %8, %9 br i1 %10, label %11, label %1...

I want to design a IR (like LLVM IR) for my toy compiler and I don't know what is the purpose of the alloca instruction in further analysis. In which optimizations alloca informations are used?

What is the correct way to create a raw_ostream object and use it for printing? I read various articles and the only example I can find is (How to redirect llvm::outs() to file?) raw_ostream *outpu...

I'm developing a compiler for a new language of mine in LLVM and have run into an issue while generating debug information. I have not yet found much documentation on how to actually generate the d...

I have been using the headers provided in include\llvm and include\llvm-c to try and make my own compiler. However, whenever I try to compile, I get this error. There is no llvm/IR/Attributes.inc i...

I am trying to get LLVM IR for a file which is linked with some static libararies. I tried to link using llvm-link . It just copy the .bc files in one file ( not like native linking). clang -L$(T_L...

What does comdat in LLVM represents? You can find the source here:Comdata An example from source level program representation (c++) would be very much helpful. If you need more info, please feel fr...

For the following branch instruction br i1 %cmp, label %if.then, label %if.end, !dbg !35 Since llvm is SSA, I can directly access the operand 0, to determine whether the comparison is true or not....

What is the "correct" (i.e., portable) way in LLVM to load data from memory into a SIMD vector? Looking at the typical IR generated by LLVM's auto-vectorizer for an x86 target, it seems l...

For example, I have a C code: void foo(int x) { int y; if (x > 0) { y = 1; } else { y = 2; } // do something with y } To simplify this code in LLVM IR level (where y can be put in the re...

For writing a compiler, what are the advantages and disadvantages of using LLVM IR vs C for a target language? I know both are used, and I imagine that the final machine code would be similar if I ...

I'm fully aware that a similar question was already asked here: Generating LLVM Code from Java The thing is, that was in 2012...I looked at the solutions and found most of the projects menti...