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14.1 How efficient is DJGPP-generated code?

Q: How does DJGPP compare with other DOS-based C compilers in terms of efficiency of generated code?

Q: Won't my program run much slower when compiled by DJGPP, due to all those CPU cycles wasted in switches between protected and real mode?

A: The quality of code generated by GCC with optimization turned on (-O2 switch to the compiler) is generally at least as good as what you will get from top commercial products, like Borland, Microsoft and Watcom. Mode switches indeed have a certain performance hit, but in most programs it is negligibly small, because only DOS and BIOS services require such a switch, and most programs spend most of their time doing other things.


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