Basic gcc Intermediate Representation Dumps

gcc produces the textual forms of the following intermediate representations of a program being compiled. Refer to info gcc corresponding to version 4.0.1 for details.

• Abstract Syntax Tree (AST). The -fdump-tree-original-raw switch dumps the textual representation of the AST for given input source.
• Gnu SIMPLE representation (GIMPLE)². The -fdump-tree-gimple-raw switch dumps the GIMPLE representation of the input source.
• Control Flow Graph (CFG). The -fdump-tree-cfg-raw switch dumps the CFG form of the GIMPLE code.
• Register Transfer Language (RTL IR)³. The -da switch dumps the RTL IR of the input source program with the pass number as a part of the dump file name.
• Assembly Language (ASM). The -S switch dumps the target assembly code for the input. In our case, this is the Pentium assembly language.

Sample programs and corresponding IR dumps