From 1843dfc794c6845c4239c05abd11a8fa1d7e694d Mon Sep 17 00:00:00 2001
From: Chris Duncan <chris@zoso.dev>
Date: Fri, 24 Jan 2025 23:15:11 -0800
Subject: [PATCH] Eliminate an atomic operation by performing an exchange if
 threshold passed.

---
 src/shaders/compute.wgsl | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/shaders/compute.wgsl b/src/shaders/compute.wgsl
index abb665b..b6ee298 100644
--- a/src/shaders/compute.wgsl
+++ b/src/shaders/compute.wgsl
@@ -1432,9 +1432,11 @@ fn main(id: vec3<u32>) {
 	/**
 	* Set nonce if it passes the threshold and no other thread has set it
 	*/
-	if ((BLAKE2B_IV32_0.y ^ v0.y ^ v8.y) > threshold && atomicLoad(&work.found) == 0u) {
-		atomicStore(&work.found, 1u);
+	if ((BLAKE2B_IV32_0.y ^ v0.y ^ v8.y) > threshold) {
+		let wasFound: u32 = atomicExchange(&work.found, 1u);
+		if (wasFound == 0u) {
 		work.nonce = m0;
+		}
 	}
 	return;
 }
-- 
2.34.1