From 3ea9ed0d2a14468d698dfe24bdb790b6f4103596 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 4 Aug 2018 19:12:43 +0200
Subject: Initial import

---
 Hilbert/SetLocation.hpp | 96 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 Hilbert/SetLocation.hpp

(limited to 'Hilbert/SetLocation.hpp')

diff --git a/Hilbert/SetLocation.hpp b/Hilbert/SetLocation.hpp
new file mode 100644
index 0000000..d7b5099
--- /dev/null
+++ b/Hilbert/SetLocation.hpp
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2006-2007 Chris Hamilton <chamilton@cs.dal.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _SETLOCATION_HPP_
+#define _SETLOCATION_HPP_
+
+
+#include <Hilbert/Common.hpp>
+#include <Hilbert/BigBitVec.hpp>
+
+
+namespace Hilbert
+{
+	template <class P,class I>
+	H_INLINE
+	void
+	setLocation(
+		P *p,
+		int n,
+		int i,
+		const I &l
+		)
+	{
+		// Easy to understand implementation
+		/*int j;
+		for ( j = 0; j < n; j++ )
+			p[j].setBit(i,l.getBit(j));
+		return;*/
+
+		// Much faster loop-unrolled implementation.
+		int ir, ib;
+		FBV_UINT im;
+		BBV_MODSPLIT(ir,ib,i);
+		im = (FBV1<<ib);
+
+#define SETBIT p->racks()[ir]|=im; if ((*lr&jm)==0) p->racks()[ir]^=im; jm<<=1; ++p;
+#define SETBIT1(a) \
+		case (a+1): SETBIT;
+#define SETBIT2(a) \
+		SETBIT1(a+1); \
+		SETBIT1(a);
+#define SETBIT4(a) \
+		SETBIT2(a+2); \
+		SETBIT2(a);
+#define SETBIT8(a) \
+		SETBIT4(a+4); \
+		SETBIT4(a);
+#define SETBIT16(a) \
+		SETBIT8(a+8); \
+		SETBIT8(a);
+#define SETBIT32(a) \
+		SETBIT16(a+16); \
+		SETBIT16(a);
+
+		int j = 0;
+		FBV_UINT jm = 1;
+		const FBV_UINT *lr = l.racks();
+		while ( j < n )
+		{
+			if ( jm == 0 )
+			{
+				jm = 1;
+				++lr;
+			}
+			
+			int dj = n - j;
+			switch ( n - j )
+			{
+				default: dj = 32;
+				SETBIT32(0);
+			}
+			j += dj;
+		}
+		
+		return;
+	}
+
+};
+
+
+#endif
-- 
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