(anonymous namespace)::EmitAssemblyHelper::RunOptimizationPipeline(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>&, std::unique_ptr<llvm::ToolOutputFile, std::default_delete<llvm::ToolOutputFile>>&, clang::BackendConsumer*) ...
{ // SPIR-V has core support for atomic ops, and Int32 is always available; // we take the maximum because it's possible the Host supports wider types. MaxAtomicInlineWidth = std::max<unsigned char>(MaxAtomicInlineWidth, 32); - resetDataLayout("e-p:32:32-i64:64-v16:16-v24:32-...
-O3Maximumoptimization最大优化 -OspaceOptimizeforcodesize对代码大小进行优化 -OtimeOptimizeformaximumperformance优化最大优化级别的运行时间 --cpu<cpu>SelectCPUtogeneratecodefor选择CPU --cpulistOutputalistofalltheselectableCPUs输出所有被选中的CPU列表 -o<file>Namethefinaloutputfileofthecompilation最终输出文件的...
/usr/lib/llvm/15/bin/clang-15 -cc1 -triple x86_64-pc-linux-gnu -emit-obj --mrelax-relocations -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name fixdep.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -fmath-e...
传统的编译器通常分为三个部分,前端(frontEnd),优化器(Optimizer)和后端(backEnd). 在编译过程中,前端主要负责词法和语法分析,将源代码转化为抽象语法树;优化器则是在前端的基础上,对得到的中间代码进行优化,使代码更加高效;后端则是将已经优化的中间代码转化为针对各自平台的机器代码。
clang[options]filename...DESCRIPTION clang is a C,C++,andObjective-C compiler which encompasses preprocessing,parsing,optimization,code gen-eration,assembly,andlinking.Depending on which high-level mode setting is passed,Clang will stop before ...
clang [options] filename …DESCRIPTION clang is a C, C++, and Objective-C compiler which encompasses preprocessing, parsing, optimization, code generation, assembly, and linking. Depending on which high-level mode setting is passed, Clang will stop before doing a full link. While Clang is highl...
disable_tail_calls (clang::disable_tail_calls) Supported Syntaxes GNUC++11C2x__declspecKeywordPragmaPragma clang attribute X X X The disable_tail_calls attribute instructs the backend to not perform tail call optimization inside the marked function. For example: int callee(int); int foo(int ...
To facilitate disabling optimization for a range of function definitions, a range-based pragma is provided. Its syntax is #pragma clang optimize followed by off or on. All function definitions in the region between an off and the following on will be decorated with the optnone attribute unless...
I first experimented with Clang for Cortex-M in 2013 and at the time the backend for code-size optimization for ARM just didn’t compete with other compilers like GCC. These days it seems like things are getting pretty close, and I’m quite impressed at how the toolchain has progressed ov...