From 9e32042df839bc95a297b8627efae86eb10e8cbf Mon Sep 17 00:00:00 2001
From: Ahmet Inan <inan@aicodix.de>
Date: Thu, 11 May 2023 09:01:08 +0200
Subject: [PATCH] removed block shuffle

---
 permute.hh | 42 ------------------------------------------
 1 file changed, 42 deletions(-)

diff --git a/permute.hh b/permute.hh
index 715b905..2f4d3f2 100644
--- a/permute.hh
+++ b/permute.hh
@@ -41,48 +41,6 @@ public:
 	}
 };
 
-template <int SIZE, int BLOCK>
-class ReversibleBlockShuffle
-{
-	static_assert(SIZE >= 2 * BLOCK, "SIZE not large enough");
-	static_assert(SIZE % BLOCK == 0, "BLOCK does not divide SIZE");
-	static constexpr int BLOCKS = SIZE / BLOCK;
-	int seq[SIZE-1];
-public:
-	ReversibleBlockShuffle()
-	{
-		CODE::Xorshift32 prng;
-		for (int j = 0; j < BLOCKS; ++j) {
-			if (j < BLOCKS-1)
-				seq[BLOCK*j] = j + prng() % (BLOCKS - j);
-			for (int i = 0; i < BLOCK-1; ++i)
-				seq[BLOCK*j+1+i] = i + prng() % (BLOCK - i);
-		}
-	}
-	template <typename TYPE>
-	void forward(TYPE *array)
-	{
-		for (int j = 0; j < BLOCKS; ++j) {
-			if (j < BLOCKS-1)
-				for (int i = 0; i < BLOCK; ++i)
-					std::swap(array[BLOCK*j+i], array[BLOCK*seq[BLOCK*j]+i]);
-			for (int i = 0; i < BLOCK-1; ++i)
-				std::swap(array[BLOCK*j+i], array[BLOCK*j+seq[BLOCK*j+1+i]]);
-		}
-	}
-	template <typename TYPE>
-	void reverse(TYPE *array)
-	{
-		for (int j = BLOCKS-1; j >= 0; --j) {
-			for (int i = BLOCK-2; i >= 0; --i)
-				std::swap(array[BLOCK*j+i], array[BLOCK*j+seq[BLOCK*j+1+i]]);
-			if (j < BLOCKS-1)
-				for (int i = 0; i < BLOCK; ++i)
-					std::swap(array[BLOCK*j+i], array[BLOCK*seq[BLOCK*j]+i]);
-		}
-	}
-};
-
 template <int SIZE, typename TYPE>
 static void BitReversalPermute(TYPE *array)
 {