Fastest way to set output pin?

[deep_rune]

I have an interrupt which I'm trying to streamline (for an STM32F031K6). I am using some commands like

GPIOA->BSRR |= (1<<4);

and i was surprised to see how much there is in this command in the disassembly. Is there any faster way of implementing this?

[Tesla DeLorean · Accepted solution]

GPIOA->BSRR = (1<<4); // Singular write, as designed, not RMW

[TDK]

There is never a need to read the BSRR register. It always reads as zero.

The current output state is given in the ODR register.

[Uwe Bonnes]

If you want to go fats, make sure GPIOA->BSRR is read from RAM, not Flash. Wait state to read that data may apply.

[deep_rune]

interesting, how do i do that?