Defer loading the invalidate index until it is actually needed

DNedic · Jun 5, 2023 · 6fc1999 · 6fc1999
1 parent 5a0862b
commit 6fc1999
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lfbb/src/lfbb.c b/lfbb/src/lfbb.c
@@ -143,7 +143,6 @@ uint8_t *LFBB_ReadAcquire(LFBB_Inst_Type *inst, size_t *available) {
     /* Preload variables with adequate memory ordering */
     const size_t r = atomic_load_explicit(&inst->r, memory_order_relaxed);
     const size_t w = atomic_load_explicit(&inst->w, memory_order_acquire);
-    const size_t i = atomic_load_explicit(&inst->i, memory_order_relaxed);
 
     /* When read and write indexes are equal, the buffer is empty */
     if (r == w) {
@@ -158,6 +157,7 @@ uint8_t *LFBB_ReadAcquire(LFBB_Inst_Type *inst, size_t *available) {
     }
 
     /* Read index reached the invalidate index, make the read wrap */
+    const size_t i = atomic_load_explicit(&inst->i, memory_order_relaxed);
     if (r == i) {
         inst->read_wrapped = true;
         *available = w;