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| author | Megan Wachs <megan@sifive.com> | 2017-01-24 17:02:02 -0800 |
|---|---|---|
| committer | Megan Wachs <megan@sifive.com> | 2017-01-24 17:02:02 -0800 |
| commit | d6e76482adced83f835a1d1f075826ccf24034ca (patch) | |
| tree | 6187f1bb28911df04c0ae3fdb2ff1cd60c32c204 | |
| parent | c72e4fcd4a77354d0d427cef263ebe438aeeae6e (diff) | |
use relaxed memory model for bitbang demo to avoid unncessary fences in the output
| -rw-r--r-- | software/demo_gpio/demo_gpio.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/software/demo_gpio/demo_gpio.c b/software/demo_gpio/demo_gpio.c index 040d864..00bc8cd 100644 --- a/software/demo_gpio/demo_gpio.c +++ b/software/demo_gpio/demo_gpio.c @@ -232,10 +232,9 @@ int main(int argc, char **argv) * Atomics give a quick way to control a single bit. *************************************************************************/ uint32_t mask = (1 << PIN_19_OFFSET); - uint32_t other_mask = (1 << PIN_19_OFFSET); while (1){ - atomic_fetch_xor(&GPIO_REG(GPIO_OUTPUT_VAL), mask); + atomic_fetch_xor_explicit(&GPIO_REG(GPIO_OUTPUT_VAL), mask, memory_order_relaxed); } return 0; |