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Author Topic: pitfalls of registers variables  (Read 1097 times)

shiva

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pitfalls of registers variables
« on: May 21, 2012, 06:06:41 pm »
what  is the pitfalls of registers variables...?

CommonTater

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Re: pitfalls of registers variables
« Reply #1 on: May 21, 2012, 06:57:04 pm »
If you mean designating a local variable as register, as in...
Code: [Select]
int register counter;

There should be no downside since it's only a suggestion for the compiler.  It will decide at compile time if it can do that or not.  Remember there are only a limited number of CPU registers available and generally it's best to let the optimizer make those decisions.




Offline AlexN

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Re: pitfalls of registers variables
« Reply #2 on: May 21, 2012, 07:05:46 pm »
what  is the pitfalls of registers variables...?
... and AFAIK for Pelles C the keywords auto and register has the same meaning and the compiler will decide itself which variables are kept in registers.
best regards
 Alex ;)

CommonTater

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Re: pitfalls of registers variables
« Reply #3 on: May 21, 2012, 07:11:33 pm »
Thanks Alex... and FWIW, the help file says auto is the default for local variables...