"register" keyword in C? "register" keyword in C? c c

"register" keyword in C?


c memory keyword

It's a hint to the compiler that the variable will be heavily used and that you recommend it be kept in a processor register if possible.

Most modern compilers do that automatically, and are better at picking them than us humans.

c memory keyword

I'm surprised that nobody mentioned that you cannot take an address of register variable, even if compiler decides to keep variable in memory rather than in register.

So using register you win nothing (anyway compiler will decide for itself where to put the variable) and lose the & operator - no reason to use it.

c memory keyword

It tells the compiler to try to use a CPU register, instead of RAM, to store the variable. Registers are in the CPU and much faster to access than RAM. But it's only a suggestion to the compiler, and it may not follow through.

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