Register use in C compiler

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i'm porting time-hungry app bare avr arduino. original asm code processed time-critical data in registers (via timer interrupt call @ fclk/256). load once, run in registers until reset, no calls ram inside isr.

is there way instruct arduino compiler not use specific registers?

or, alternatively, there registers never used compiler default? ones?

you have pass -ffixed-reg option compiler (e.g., -ffixed-reg=r7) i'm not sure of how you'd within arduino gui (if it's possible). may better off compiling command line.

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Arduino Forum > Forum 2005-2010 (read only) > Software > Development > Register use in C compiler


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