From d6e76482adced83f835a1d1f075826ccf24034ca Mon Sep 17 00:00:00 2001
From: Megan Wachs <megan@sifive.com>
Date: Tue, 24 Jan 2017 17:02:02 -0800
Subject: use relaxed memory model for bitbang demo to avoid unncessary fences
 in the output

---
 software/demo_gpio/demo_gpio.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'software')

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;
-- 
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