7/8/2023 0 Comments Free c compiler reddiythe use of vector instructions when possible, instruction reordering to increase branch prediction efficiency, and so on.Īfter that, object code is ready for linking. Then that language is converted into platform-specific code (x86, ARM, etc) doing roughly the same thing in a platform-optimized way. They use an intermediate low-level but platform-independent language for initial code generation. Most modern compilers (for instance, gcc and clang) repeat the last two steps once more. Peephole optimization: the low-level code is scanned for simple local inefficiencies which are eliminated.Some function calls can be inlined at this stage, some loops unrolled, etc. Code generation: the AST is transformed into linear low-level code, with jumps, register allocation and the like.early calculation of common subexpressions and constant expressions, eliminating excessive local assignments (see also SSA), etc. Equivalent transformations and high-level optimization: the AST is transformed to represent a more efficient computation with the same semantics. unreachable code or duplicate declarations. Semantic validation: weeding out syntactically correct statements that make no sense, e.g.Resolution of references to other modules (C postpones this step till linking).Parsing: the source text is converted to an abstract syntax tree (AST).A typical compiler does the following steps:
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