C/C++ interview question --- question 2

What are the disadvantages of inlining all functions in C?

 

 few reasons why it would be a bad idea:

• Code size increases greatly especially when inlining large functions
• Instruction caches become much less effective because you are always fetching new instructions from higher up in the memory hierarchy and never re-using instructions.
• Register spilling would increase the stack usage but then, if you just had normal functions, you would have to pop/push activation records onto the stack instead of spilling. So, this last tradeoff is highly dependent on the code and the compiler.