A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
LLVM 源文件并对其运行指定的优化 and / or 分析的工具。
-bash/zsh: opt command not found # Windows (WSL2) sudo apt-get update sudo apt-get install llvm-8 # Debian apt-get install llvm-3.0 # Ubuntu apt-get install llvm-8 # Alpine apk add llvm # Arch Linux pacman -S llvm6 # Kali Linux apt-get install llvm-7 # CentOS yum install llvm # Fedora dnf install llvm3.7 # OS X brew install llvm # Raspbian apt-get install llvm-3.2 # Dockerfile dockerfile.run/opt # Docker docker run cmd.cat/opt opt
-f
Enable binary output on terminals. Normally, opt will refuse to write raw bitcode output if the output stream is a terminal. With this option, opt will write raw bitcode regardless of the output device.
-help
Print a summary of command line options.
-o <filename>
Specify the output filename.
-S
Write output in LLVM intermediate language (instead of bitcode).
-{passname}
opt provides the ability to run any of LLVM’s optimization or analysis passes in any order. The -help option lists all the passes available. The order in which the options occur on the command line are the order in which they are executed (within pass constraints).
-strip-debug
This option causes opt to strip debug information from the module before applying other optimizations. It is essentially the same as -strip but it ensures that stripping of debug information is done first.
-verify-each
This option causes opt to add a verify pass after every pass otherwise specified on the command line (including -verify). This is useful for cases where it is suspected that a pass is creating an invalid module but it is not clear which pass is doing it.
-stats
Print statistics.
-time-passes
Record the amount of time needed for each pass and print it to standard error.
-debug
If this is a debug build, this option will enable debug printouts from passes which use the LLVM_DEBUG() macro. See the LLVM Programmer’s Manual, section #DEBUG for more information.
-load=<plugin>
Load the dynamic object plugin. This object should register new optimization or analysis passes. Once loaded, the object will add new command line options to enable various optimizations or analyses. To see the new complete list of optimizations, use the -help and -load options together. For example:
opt -load=plugin.so -help
-print-passes
Print all available passes and exit.
opt 对位码文件运行优化或分析：
opt -passname path/to/file.bc -S -o file_opt.bc
opt 将函数的控制流图输出到 .dot 文件：
opt -dot-cfg -S path/to/file.bc -disable-output
opt 对程序进行级别2的优化，并将结果输出到另一个文件：
opt -O2 path/to/file.bc -S -o path/to/output_file.bc