From f90e4c329975a59968f43201c05cb85018921e43 Mon Sep 17 00:00:00 2001
From: David Grellscheid <david.grellscheid@uib.no>
Date: Mon, 2 Sep 2024 07:21:40 +0200
Subject: [PATCH] More striking vector example
---
exercises/week02.md | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/exercises/week02.md b/exercises/week02.md
index 77b3163..13735fe 100644
--- a/exercises/week02.md
+++ b/exercises/week02.md
@@ -60,12 +60,12 @@ int special_add(int a, int b){
}
```
-10. **(optional)** Have you heard about vectorization before? Declare the function provided below and set the flags to **-O2** and observe how the asembly code differs to having set the flags to to **-O2** **-mavx**
+10. **(optional)** Have you heard about vectorization before? Declare the function provided below and set the flags to **-O1**, **-O2** and observe how the asembly code differs to having set the flags to to **-O2** **-mavx**. Now change the size of the loop, try 4, 8, 16. How many add-operations are run in the assembly?
```c
-void add_arrays(float *a, float *b, float *result, int n) {
- for (int i = 0; i < n; i++) {
- result[i] = a[i] + b[i];
+void add_arrays(float *a, float b) {
+ for (int i = 0; i < 8; i++) {
+ a[i] += b;
}
}
```
--
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