Llvm opt output ll. The opt command is the modular LLVM optimizer.

Llvm opt output ll Show better ways of doing the same thing, generally with some sort of -passes=print<foo>. I set the prologue function's attribute to "AlwaysInline" using addFnAttr(). Introduction — What is a pass? Quick Start — Writing hello world. c -o foo. > clang -S -emit-llvm foo. bc). The opt command is the modular LLVM optimizer and analyzer. ll) file with modifying some opt's features to see its impact, mostly want to delete X86 specialized passes – Hello, There is an option that I don’t know how to used it. Hi, Using the opt tool with option -strip-debug will read in an LLVM-IR file, strip any debug info, then write out a new LLVM-IR file, for example: opt input. The opt command is the modular LLVM optimizer. If the -o option is omitted, then llc will send its output to standard output if the input is from standard input. With I am new to llvm framework and was able to run a basic pass to iterate over instructions in a simple IR function with only entry basic block, but to expand upon that I got an . How can you apply certain optimizations in a specified order? Best, HwJ Inputs can be in either the LLVM assembly language format (. ll -disable-output -enable-new-pm=0 If filename is omitted from the command line or is “-”, opt reads its input from standard input. An Example Using the LLVM Tool Chain. "); What would be the command in opt to get the output from AlwaysInline. -help Print a summary of command line options. I noticed something inconvenient with opt, namely that splitting a call does not always give the same output: % llvm-stress > stress. c. 1. I just assumed it would never do things like this but do I need to somehow know in advance which functions are a bad candidate for inlining and mark those as such? Not even Inputs can be in either the LLVM assembly language format (. ll Now my goal is to produce the IR identical to linpack-pc-3. ll-o output. Normally, opt will refuse to write raw bitcode output if the output stream is a terminal. The -emit-llvm option can also be passed to the compiler front-end directly, and not the driver by means of -cc1: > clang -cc1 foo. ubuntu@ubuntu:~/code$ opt -dot-cfg test. com> Date: Thu Sep 30 18:52:38 2021 +0100 Revert "Recommit "[SCEV] Look through single Adam, thanks for all the suggestions! One nice aspect of the -Rpass family of options is that I can filter based on what I want. I’m trying to write an LLVM Pass Manager Pass that conditionally transforms a function based on an existing LLVM attribute. In the program the prologue function is defined as static inline. bugpoint cannot debug problems with the LLVM linker. so input. via opt -o3 -S input. 8 release, OS is Ubuntu:22. If an output filename is not specified with the -o option, We will use opt. Here we describe how to write the “hello world” of passes. Hopefully this helps someone else who ends up here. bc | llvm-dis > file. ll(opt command worked what I want to do) I'm writing a custom LLVM analysis pass and want to output a simple CSV file in the pass's do_finalization method. Hello everyone I am trying to use some LLVM optimizations like -die or -adce. bc executes but generates no . __**-S**__ Write output in LLVM intermediate language (instead of bitcode). ll -o test-mem2reg. 0git documentation and have set up a simple pass related to memory access. That's an interesting idea. How can I fix it? I am able to generate CFG and Callgraph with opt --dot-cfg foo. I’m assuming it might be using the new pass manager and adding all passes except an inliner. so -mypass -myarguments -S -o output. Have a look at the answers to this question for more about this shell syntax. ll % opt -dse -verify -dce stress. With this option, llvm-link will write raw bitcode regardless of the output device. bugpoint is useful for proactively finding bugs Craig, thanks a lot! I’m actually confused by clang optimization flags. ll files, one unoptimized and one with mem2reg optimizer pass: clang -emit-llvm -O0 -c test. Without this patch, opt is never called for llvm-assembly (. ll file, I can load a plugin first, and then run the pass using the plugin: opt -load=. Wanting to use it on larger projects, I found that it can take a while to analyze the optimization reports. Options-f. ll or opt -mem2reg < file. ll > without_dce. llc -o bleh. ll > with_dce. ll means to run the command opt -passes=print while reading from the file named cycles and writing to the file named input. Trying this (for DCE): * clang -S -emit-llvm test. If an output filename is not specified with the -o option, I am not using clang, but using an IR file generated form another compiler in LLVM IR format, I want to try opt in ( . ll after the debug-info is removed. I’m following the instructions at Writing an LLVM Pass — LLVM 19. bc and with opt --dot-callgraph foo. c to generate a . ll when -opt-bisect-limit starts skipping opt -load lib/LLVMHello. LLVM Dev List Archives. Furthermore, I am curious whether the LLVM IR file with appended metadata affects performance during execution. Basic code required. ll but in my case it does not work. bc % opt -dse Inputs can be in either the LLVM assembly language format (. bc llvm-dis ssa. If that also crashes, you may be experiencing a linker bug. dot for cfg. ll. ll by passing a sequence of optimizations to opt. ll -passes=dot-cfg successfully exports the . If I run llvm-as < /dev/null | opt -O0/1/2/3 -disable-output -debug-pass=Arguments, it also shows many optimization flags (denote as set C). ll, where the loop would be My LLVM version is 18. For example, if I compile with: clang -o test test. /myPass. c -o o2_main. However, it appears that somewhere earlier in the opt PassManager process that the attributes are stripped out, the functions always appear to be attributeless. The “HelloWorld” pass is designed to simply print out the name of non-external functions that exist in the program being compiled. s You can also use the print function: void print (raw_ostream &OS, AssemblyAnnotationWriter *AAW, bool ShouldPreserveUseListOrder=false, bool IsForDebug=false) const How do I make LLVM opt output an IR file when given an IR file? 1. It takes LLVM source files as input, runs the specified optimizations or analyses on it, and then outputs the optimized file. OPTIONS¶-f ¶ Enable binary output on terminals. ll Both . s As far as I know, the only insights you can gain into the workings of SCEV without touching any code is enable statistics (opt -stats) - you can see the statistics emitted by SCEV in the implementation (look for the STATISTIC macro invocations in global scope). My main aim is to disa. c file, then used clang -emit-llvm -S test. This is inadvisable as it may cause display problems. Running a pass with opt. Passing -opt-bisect-print-ir-path=path/foo. To get the list of optimizations used by opt for O3, I run this: opt -O3 -disable-output -debug-pass=Arguments linpack-pc. -o filename ¶ Specify the output file name. If I only want to see which inlines I missed, I could use clang -Rpass-missed="inline", for example. ll -o output. But my C++ code didn’t work what I want to do. ll) or the LLVM bitcode format (. 0git documentation) I checked [Running a pass with opt]. ll -S Will read in input. The output maybe the functions name in the input. csv (or more generally <output Would perhaps be nice to get the first step done (to echo the RUN line, even if it also echoes the echo cmd itself). mir <other options> -stop-after=machine-cp -simplify-mir bleh. EDIT: as suggested in one answer, using -mem2reg optimization pass gives me the following output. ll > foo1. If an output filename is not specified with the -o option, opt writes its output to the If filename is omitted from the command line or is "-", opt reads its input from standard input. bc I have registered my pass with the following code: static RegisterPass X(“mypass”, “MyPass Pass (with getAnalysisUsage implemented)”); How do I include the same pass in the clang driver. I have written some passes that transform the module in a way that llvm-dis fails to convert the bitcode to IR. DESCRIPTION. Printing the CFG for a . Example Applying this patch to the HelloWorld example pass, it should output Here it is crashing opt: $ ~/llvm-debug/bin/opt -use-gpu-divergence-analysis -divergence stripped. Normally, opt will refuse to write raw bitcode output if the output stream is a terminal opt -S -O3 -o linpack-pc-3. It takes LLVM bytecode as input, runs the specified optimizations on it, and then outputs the optimized LLVM bytecode. If bugpoint crashes before you see its “All input ok” message, you might try llvm-link-v on the same set of input files. I know there is a flag opt -O3 -debug-pass-manager to get the detail, but it is too "detail" and I just want to know the order of passes ON use. OPTIONS¶-f¶ Enable binary output on terminals. ll You can control what ends up in the output file by changing the argument to "-stop-after". Testing a pass I wonder if it is possible to make the LLVM opt tool to report in detail which optimization passes are successfully used during each optimization level like -O1,-O2, etc. I found that I can do the following to get MIR from a . Basically, I want to have an LLVM IR dump before and after each optimization pass. g, opt -load libMyPass. I wonder how to get the passes of ON. ll which however applies machine dependent optimizations. This is typically used to optimize the output from the llvm-gcc front end. I am using opt to generate an optimized (inline the calls to the store prologue) using the Writing an LLVM Pass¶. ll) or the LLVM bitcode format Inputs can be in either the LLVM assembly language format (. 1 release. ll is converted into the inlined. org/docs/WritingAnLLVMPass. Setting up the build. ll Like opt -passes=helloworld input. I compiled the source code and generated 2 . See the definition of add_llvm_pass_plugin for more CMake details. ll file is only that. If filename is “-”, then llvm-link will write its output to standard output. sharedobjectswithcustompasses Inputs can be in either the LLVM assembly language format (. Normally, opt will refuse to write raw bitcode output if the output stream is a terminal you REALLY want to taste LLVM bitcode first-hand, you can force output with the `-f’ option. For example, by using opt -inline command,main. ll -strip-debug -o output. Something like this – just picked -function-import as an example: function-import options: -compute-dead - Compute dead symbols Inputs can be in either the LLVM assembly language format (. 1: 279: May 17, 2019 I use “opt -dot-cfg sample. tostdout) loadplugins,i. /inputs/input_for_hello. I run my code in M1 MacOs, with the following tool versions: workspace clang --version Homebrew clang Quick Start — Writing hello world ¶. Enable binary output on terminals. ll -o If filename is omitted from the command line or is "-", opt reads its input from standard input. c" target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-pc-linux-gnu" ; Function Attrs: noinline The WARNING is about the bitcode output of opt, clang -S -emit-llvm foo. ll) or the LLVM If filename is omitted from the command line or is “-”, opt reads its input from standard input. With this option, opt will write raw bitcode regardless of the output device. e. ll linpack-pc. examples on optimization step. ll) or the LLVM bitcode format The opt tool is LLVM's modular optimizer and analyzer. typing build/bin/opt you will use the opt binary you just built, which is probably the one you want to use when developing. If an output filename is not specified with the -o option I want to find some debugging options for Clang/LLVM which work like GCC's -fdump-tree-all-all, -fdump-rtl-all, and -fdump-ipa-all-all. ll output. Is that correct? Is there a way to get a starting set of passes that will be an approximate match LLVM 3. Try: 'opt --help' opt: Did you mean '--dot-dom'? or ubuntu@ubuntu:~/code$ opt -passes=dot-cfg test. guess I fired that off just a little too fast . If filename is omitted from the command line or is -, opt reads its input from standard input. ll But there is nothing printing out. ll will do it. ll * opt -S -dce test. For example, here is the naive bitcode of the file foo. In Eaxmple, cat /tmp/a. 04, and I'm feeling quite confused about this issue, because using opt main. so -help opt -myPass myProgram. the command I try is: opt -load=LLVMHello. The pass must provide at least one of two entry points for the new pass manager, one for static registration and one for dynamically loaded plugins: llvm::PassPluginLibraryInfo get##Name##PluginInfo(); extern "C"::llvm::PassPluginLibraryInfo llvmGetPassPluginInfo() LLVM As @compor suggests, this probably has something to do with intertwining arguments for opt and your own pass. html), but whenever I run: $BUILD_DIR If filename is omitted from the command line or is “-”, opt reads its input from standard input. Hi, I am instrumenting the stores in a program by inserting a function call (store_prologue) before every store instruction in the IR file. If input is “-” or omitted, llvm-opt-report reads from standard input. If I run clang -help, it will show many optimizations (denoted as set A) and non-optimization options (denoted as set B). Heh . Check out -cc1 --help for more details. bc cat ssa. If an output filename is not specified with the -o option, opt writes its output to the standard output. ll define i32 @foo() { a = add i32 2, 3 ret i32 %a } define void @bar() { ret void } . Otherwise the SCEV class has a dump method which may be more in line with what you're looking for. ll) files when "-opt" is passed to llvmc: $ llvmc -clang -v test. Here's a silly unoptimized bit of code which I'm generating Hey everyone, I'm running stock LLVM 3. After that, I tried build/bin/opt -disable If filename is omitted from the command line or is -, opt reads its input from standard input. foo. log, as well as on your terminal. Since there doesn’t seem to be too much opt -analyze is legacy PM-specific. ll file. The option appears in the documentation, but I try to use it I get the next message: ~/test$ opt -analyze hello. I tried running the pass: Inputs can be in either the LLVM assembly language format (. dot files I have a function which is failing LLVMVerifyFunction with the following error: Instruction does not dominate all uses! %self = alloca ptr, align 8 %l_deref_self = load ptr, ptr %self, align 8 What is wrong here? E Hi all, We’ve been fixing the various remaining issues in order to turn on the new pass manager for the optimization pipeline, and it’s about time to turn it on. Share Hello everyone, I’m new to LLVM. ll: ; ModuleID = '. OPTIONS-f Enable binary output on terminals. If the -o option specifies “-”, then the output will also be sent to standard output. ll) opmisaon-returnsanLLVMsourcefile( output. c -o ssa. ll WARNING: You're attempting to print out a bitcode file. opt-O3-print-after-all input. ll) or the LLVM bitcode format If filename is omitted from the command line or is "-", opt reads its input from standard input. --help ¶ Display available options If filename is omitted from the command line or is "-", opt reads its input from standard input. ll -o hello. g. But Nothing happened: opt -passes="dot-cfg" . Normally, opt will refuse to write raw bitcode output if the output stream is a terminal opt input. Filtering away the extra echo of the echo command is more like icing on the cake (and that is something that could be done later if For that, LLVM can serialize the remarks produced for each compilation unit to a file that can be consumed later. py ¶ Output a HTML page which gives visual feedback on Inputs can be in either the LLVM assembly language format (. Hi, Using the opt tool with option -strip-debug will read in an LLVM-IR file, strip any debug info, then write out a new LLVM-IR file, for example:. opt. Try: ‘opt --help’ I also try ‘opt --help’; but the option is not listed If filename is omitted from the command line or is “-“, opt reads its input from standard input. bc:. /1. Inputs can be in either the LLVM assembly language format (. You may want to use opt -passes='print<cycles>', that will at least not be interpreted by the shell, but I fear that Inputs can be in either the LLVM assembly language format (. bc llvm-dis test. so -p=hello < ~/Prog/PE/hello. Relationship between clang, opt and llc - LLVM Dev List Archives - LLVM Loading opt -O2 -print-after-all file. ll manually, and save it. Is it possible to use them along clang? Or is there a way where these optimization can be passed on to "opt" tool through clang, if opt is being used by clang behind the Normally, opt will refuse to overwrite an output file that already exists. The CommandLine library is primarily written for standalone applications within the LLVM framework. Testing a pass I expected the new_main. Normally, opt will refuse to overwrite an Inputs can be in either the LLVM assembly language format (. Opt: unknown pass name 'hello' - LLVM Discussion Forums Loading llc < sample_module. It might be useful for other front end compilers as well. I'd like to output test. Hi LLVM, I'm currently setting up some tools to investigate the influence of the order of optimization passes on the performance of compiled programs -nothing exceptional here. ll will execute the pass, but you may need to add a "-debug’ flag if you’re using the LLVM_DEBUG macro to wrap your print e. Both llc and opt programs have the -O# arguments, however it looks like the results are somewhat different. On the other hand, How to know the passes of ON in the form like mem2reg, due, always-inline or where is the document that describe about it?. If the -o option specifies “-”, then The unix command opt -passes=print<cycles> input. What would be the 'simplify as much as possible without machine llvm-dis reports 'malformed block'. ll files gave me the following output: Normally, opt will refuse to overwrite an output file that already exists. c' source_filename = ". bc opt -mem2reg ssa. bc > /dev/null i am getting an error opt: unknown pass name 'hello' But this is a default pass. There are many options in set C while not in Quick Start — Writing hello world ¶. ll -passes="print<loops>" The opt command is the modular LLVM optimizer and analyzer. ll < output. ll –print-before-all –O2 2>&1 > /dev/null | more A utility program that allows a custom pipeline to be built and tested Desired passes are listed in options –Some passes will be added •Eg, Verification passes –LLVM as input / LLVM as output –Uses Legacy or New Pass Manager based on options –Used for unit testing Hello Expert In Writing an LLVM Pass,(Writing an LLVM Pass — LLVM 18. ll and with_dce. It takes LLVM IR as input, applies specified optimizations, and outputs the optimized IR. Hi. bc to . 1: 53: Hello, I'd like to measure the impact of optimizations. Otherwise, it will read from the specified filename. Hey everyone, I'm running stock LLVM 3. The exact syntax for invoking the option is discussed below. ll file so that I can view the IR. c -O1 -o app2. ll 1. I’m using LLVM 3. bc -S opt: Unknown command line argument ‘-S’. Also, the verifierPass does not report any problems (might be because I This patch adds JSON output style to llvm-symbolizer to better support CLI automation by providing a machine readable output. Unfortunately we I’m trying to use the optimization by using shared object. 7 Stage Selection Adding a new Front-End In-Tree Pass Development > Out-of-Tree Pass Development < Adding a new Back-End 6 From what I have gathered, to use opt to run a compiler pass on an . For example, you can use -Wl,-disable-inlining to disable the link-time inliner, or-Wl,-disable-opt to disable all link-time optimizations. bc opt -mem2reg -S test. The question here is: Can LLVM opt helps to generate the phi node? If can, which pass takes the responsibility of it. ll having the same content. -S ¶ LLVM 3. I can do this e. The optimizations available via opt depend upon what libraries were linked into it as well as any additional libraries that have been loaded with the -load option. If filename is omitted from the command line or is "-", opt reads its input from standard input. If an output filename is not specified with the -o option, Writing an LLVM Pass¶. -cc1 adds some cool options like -ast-print. WARNING: You’re attempting to print out a bitcode file. Normally, opt will refuse to write raw bitcode output if the output stream is a terminal I was learning how to use the opt command and I noticed by inspecting the modified IR that it’s inlining some functions and then discarding chunks of code which then break the program. I can't find it. ll llc -f -O2 test. 8. ll) analysis-producesanalysesresults(e. cpp . Normally, opt will refuse to write raw bitcode output if the output stream is a terminal If filename is omitted from the command line or is “-“, opt reads its input from standard input. Related topics Topic Replies Views Activity; SSA. The function of opt depends on I use LLVM opt to run a pass using, e. ll > sample_module. Writing an LLVM Pass¶. I’m having difficulty writing a new pass and using opt. Normally, opt will refuse to write raw bitcode output if the output stream is a terminal If filename is omitted from the command line or is “-”, opt reads its input from standard input. I can not figure out whats the problem here. ll -disable-O0-optnone Remove optnone attributes in foo. ll Resultant IR generated; Function Attrs: nounwind uwtable define i32 @main() #0 { entry: ret i32 0 } Hi, I’m Ryo Ota. ll which is an LLVM IR file. commit 1fbdbb559569641f6d509b569966901c8fb02b63 Author: Florian Hahn <flo@fhahn. Normally, opt will refuse to write raw bitcode output if the output stream is a terminal I'm new for llvm. Followed the Hello, I have written a pass for the IR and I can run it with opt -load lib/LLVMMyPass. ll Which produces (shortened to avoid wasting space): If filename is omitted from the command line or is “-“, opt reads its input from standard input. What is opt? The opt command is the modular LLVM optimizer and analyzer. If filename is omitted from the command line or is “-“, opt reads its input from standard input. dot stdout optworkflow opt,LLVM’smodularopmizer,iscompilerninja’sbestfriend: takesanLLVMsourcefile(input. I’d like to inline some functions in a module in the same way as opt -inline command. “I created a . bc without success. ll file from clang for a simple c function ( don't mind the correctness of the function I don't care about it for the sake of learning llvm at least for now ). Hi Adam, Thank you for writing opt-viewer! I’ve been playing around with it and found it helps me understand what optimizations were performed, which were missed, and why, as well as easily navigate to the relevant code. OPTIONS-f Force overwrite. Testing a pass Enable binary output on terminals. Gold LTO plugin has this option. ll | opt -mem2reg | llvm-dis > output. bc, but the similar opt --dot-ddg-only foo. ll CLopons plugins opt output. Following the in I’m just trying to run the hello world example from the LLVM Writing a Pass Tutorial (https://llvm. ll opt app2. Use the -help option to If filename is omitted from the command line or is “-“, opt reads its input from standard input. ll and write to output. I’m trying to use this cmd to print . ll I enter the command llvm-config --shared-mode to check the status, and it print out shared. How can I emit LLVM IR which compiles and runs a Inputs can be in either the LLVM assembly language format (. If an output filename is not specified with the -o option, Running opt -S --passes=always-inline source. clang -c -emit-llvm ssa. Reid January 12, 2006, 6:34am 5. bc -o ssa. But foo1. Also, it can be useful to have all dumps of the AST from Clang and all phases of code generation (backend phases, Selection DAG, ISEL The -opt-bisect-limit option can be used with any tool, including front ends such as clang, that uses the core LLVM library for optimization and code generation. This option is being used for some post-link code analysis tools that have to see a whole program but don't need to see them in the native machine code. define dso_local i32 @main() #0 { %1 = alloca i32, align 4 %2 = alloca i32, align 4 %3 = alloca i32, align 4 store i32 0, i32* %1, align 4 The opt command is the modular LLVM optimizer. Inputs can be in either the LLVM assembly language format (. ll -o /tmp/llvm_gvO2nK/test. Reid. If filename is omitted from the command line or is “-”, opt reads its input from standard input. Furthermore, I am curious whether the LLVM IR file with appended metadata affects performance during I stumbled upon this through Google. With this option, opt will overwrite the output file and replace it with new bitcode. Is there another opt possible call? Or someone has suggestions for other similar tools? If filename is omitted from the command line or is -, opt reads its input from standard input. 0. ll to contain the result, of running the pass, in IR format. Normally, llvm-link will refuse to write raw bitcode output if the output stream is a terminal. So, I’d like to add them to pass specific cl::OptionCategory’s to simplify the output. It makes the linker to combine all bitcode files and write the result to an output file without doing codegen. bc), but I would like to dump the IR to a . By default, the format of the serialized remarks is YAML, opt-viewer. bc” command to view cfg, but I encountered the following warning. LLVM currently enables the maximal optimizations by default, you can only disable options. c -emit-llvm Produces foo. I'd like to name the CSV file based on the desired output filename passed to Clang/LLVM, but I can't find this value. ll If filename is omitted from the command line or is “-“, opt reads its input from standard input. Quick Start — Writing hello world ¶. If the -o option is omitted, then llvm-opt-report will send its output to standard output. If an output filename is not specified with the -o option If filename is omitted from the command line or is -, opt reads its input from standard input. ll will dump the IR to path/foo. ll to be the same as the output of clang -O2 -emit-llvm -Xclang -disable-O0-optnone -S main. 8 Stage Selection Adding a new Front-End In-Tree Pass Development > Out-of-Tree Pass Development < Adding a new Back-End 6 --plugin-opt=emit-llvm is an option for LTO. . LLVM_DEBUG(dbgs() << "Hello debug world. dot file. Recently I learn some about the phi node, hence I tried to use clang and opt to see how the phi node is emitted. I know llvm-dis can convert . c * opt -S test. If you REALLY want to taste LLVM bitcode I have some code which uses llvm-13 to do optimizing while disabling inlining: opt-13 -O3 -enable-new-pm=0 --disable-inlining I’m wondering how to replicate this in LLVM 14 and 15. As @mikaelholmen says such a patch seem to bring back some of the output from --echo-all-commands that went missing. c Produces foo. Use opt instead of llc to run middle-end passes instead of back-end passes, and you can use --help-hidden to see the secret flags. ll is an IR file, and I want foo1. I have a quesion about inlining function in C++ API. ll with the IR. if you just type opt it will use the system installed version of opt probably from the linux distributions version. ll It takes LLVM bitcode as input, runs the specified optimizations or analyses on it, and then outputs the optimized LLVM bitcode or the analysis results. ll gives without_dce. so my-pass foo. Both llc and opt programs have the -O# arguments, however it looks like I find opt -help output to be a little hard to grok, and have to look at the actually cpp file to figure out which options are valid for a particular pass. –Eg, opt test. ll opt: Unknown command line argument '-dot-cfg'. A work-around is to generate the LLVM IR code (via clang) with the -O1 flag, which has other side effects; but then allows opt to generate the Natural Loop Information with the following syntax: clang -S -emit-llvm app2. I also tried opt -passes=dot-ddg foo. ll -o stress-1. If an output filename is not specified with the -o option, opt writes its If filename is omitted from the command line or is "-", opt reads its input from standard input. to get a copy of bugpoint ’s output in the file bugpoint. Switch back to the legacy Pass Manager when using opt: opt -dot-cfg foo. On the other hand, optimization remark YAML always include remarks from all passes (as far as I can tell), which increases the amount of llvm-as < input. You can type which opt to see what was used. c -o test. (Thanks to everyone who has helped with testing and fixin If filename is omitted from the command line or is “-”, opt reads its input from standard input. I see from this question there is a way to dump a module to bitcode (. opt input. povvur ddmsc xfnffjf dnxs rjktyzpz asfyd qxgi pjhw opxv zsdflq