From 2b25cd3dcc0c403fb0074e884200f0b3b522c768 Mon Sep 17 00:00:00 2001
From: Ahmet Inan <inan@aicodix.de>
Date: Tue, 24 Sep 2019 10:49:18 +0200
Subject: [PATCH] added code to explain rotate.hh

---
 README.md | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index e39d0b0..89157f4 100644
--- a/README.md
+++ b/README.md
@@ -89,5 +89,17 @@ Single instruction, multiple data ([SIMD](https://en.wikipedia.org/wiki/SIMD)) w
 
 ### [rotate.hh](rotate.hh)
 
-([SIMD](https://en.wikipedia.org/wiki/SIMD)) element wise horizontal rotation
+[SIMD](https://en.wikipedia.org/wiki/SIMD) element wise horizontal rotation
+
+It computes the following, but faster:
+
+```
+SIMD<int8_t, SIZE> rotate(SIMD<int8_t, SIZE> input, int shift, int WIDTH)
+{
+	SIMD<int8_t, SIZE> output;
+	for (int n = 0; n < WIDTH; ++n)
+		output.v[(n + shift + WIDTH) % WIDTH] = input.v[n];
+	return output;
+}
+```