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google / ml-compiler-opt

Infrastructure for Machine Learning Guided Optimization (MLGO) in LLVM.
Apache License 2.0
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【Question】What parameters need to be passed in to compile the data set? -Oz -Xclang -fembed-bitcode=all？ #321

Closed 18liumin closed 8 months ago

18liumin commented 9 months ago

cmake -GNinja -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/googletest_install -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_CXX_COMPILER=${LLVM_INSTALLDIR}/bin/clang++ -DCMAKE_C_COMPILER=${LLVM_INSTALLDIR}/bin/clang -DCMAKE_C_FLAGS="-Oz -Xclang -fembed-bitcode=all" -DCMAKE_CXX_FLAGS="-Oz -Xclang -fembed-bitcode=all" ..

boomanaiden154 commented 9 months ago

For inlining-for-size, you want to set up the build system to enable -Oz or at least -Os. This can be done in a variety of ways, for example CMake's CMAKE_BUILD_TYPE=MinSizeRel. Just adding -Oz or -Os to the compiler flags may not work depending upon how the build system is setup. And then you just need -Xclang -fembed-bitcode=all to embed the bitcode into the object file so that the ml-compiler-opt tooling is able to process it.

boomanaiden154 commented 9 months ago

Was there a comment/question here that got deleted? Got an email, but there's nothing here...