Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

Atomic Instruction Block

Is there a faster way to make a critical block of instructions atomic (not interruptible) than using the alt_irq_disable_all and alt_irq_enable_all HAL functions? Chris
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

If you find a more efficient way then I'd be interested to hear it.

At optimisation level -O2 these functions compile up into exactly the same code as described above: 

rdctl rx, status
wrctl status, zero

at the start and 

wrctl status, rx

at the end (where rx is a register between r2 and r23 chosen by the compiler).

Please check your objdump file to see what the compiler has generated for you.