From b71b88dad50093bf52ff7020722f083ba89cceea Mon Sep 17 00:00:00 2001
From: KarhouTam <karhoutam@qq.com>
Date: Fri, 29 Aug 2025 22:03:34 +0800
Subject: [PATCH] Fix comments to clarify variable roles in
 SharedMemoryReduction kernel

---
 lecture_009/segment_reduce.cu | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lecture_009/segment_reduce.cu b/lecture_009/segment_reduce.cu
index bf6c21f..0a49a34 100644
--- a/lecture_009/segment_reduce.cu
+++ b/lecture_009/segment_reduce.cu
@@ -5,8 +5,8 @@
 
 __global__ void SharedMemoryReduction(float* input, float* output, int n) {
     __shared__ float input_s[BLOCK_DIM]; 
-    unsigned int idx = blockIdx.x * blockDim.x + threadIdx.x; // index within a block
-    unsigned int t = threadIdx.x; // global index
+    unsigned int idx = blockIdx.x * blockDim.x + threadIdx.x; // global index
+    unsigned int t = threadIdx.x; // index within a block
 
     // Load elements into shared memory
     if (idx < n) {