This is the main selling point. 8051 microcontrollers often have very small memory footprints (e.g., 8KB or 16KB Flash).
C/C++ Compiler , C-SPY Debugger, Assembler, Linker, and Librarian. Language Support: C, C++, and 8051 Assembly. iar embedded workbench for 8051
Note: Results vary with 8051 derivative and optimization level. This is the main selling point