util: Move Mesa's bitset.h to util/.

Reviewed-by: Jose Fonseca <[email protected]>

1 files changed, 99 insertions, 0 deletions

diff --git a/src/util/bitset.h b/src/util/bitset.h
new file mode 100644
index 00000000000..17c5d5d252a
--- /dev/null
+++ b/src/util/bitset.h
@@ -0,0 +1,99 @@
+/*
+ * Mesa 3-D graphics library
+ *
+ * Copyright (C) 2006  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file bitset.h
+ * \brief Bitset of arbitrary size definitions.
+ * \author Michal Krol
+ */
+
+#ifndef BITSET_H
+#define BITSET_H
+
+#include "util/u_math.h"
+
+/****************************************************************************
+ * generic bitset implementation
+ */
+
+#define BITSET_WORD unsigned int
+#define BITSET_WORDBITS (sizeof (BITSET_WORD) * 8)
+
+/* bitset declarations
+ */
+#define BITSET_WORDS(bits) (((bits) + BITSET_WORDBITS - 1) / BITSET_WORDBITS)
+#define BITSET_DECLARE(name, bits) BITSET_WORD name[BITSET_WORDS(bits)]
+
+/* bitset operations
+ */
+#define BITSET_COPY(x, y) memcpy( (x), (y), sizeof (x) )
+#define BITSET_EQUAL(x, y) (memcmp( (x), (y), sizeof (x) ) == 0)
+#define BITSET_ZERO(x) memset( (x), 0, sizeof (x) )
+#define BITSET_ONES(x) memset( (x), 0xff, sizeof (x) )
+
+#define BITSET_BITWORD(b) ((b) / BITSET_WORDBITS)
+#define BITSET_BIT(b) (1 << ((b) % BITSET_WORDBITS))
+
+/* single bit operations
+ */
+#define BITSET_TEST(x, b) ((x)[BITSET_BITWORD(b)] & BITSET_BIT(b))
+#define BITSET_SET(x, b) ((x)[BITSET_BITWORD(b)] |= BITSET_BIT(b))
+#define BITSET_CLEAR(x, b) ((x)[BITSET_BITWORD(b)] &= ~BITSET_BIT(b))
+
+#define BITSET_MASK(b) ((b) == BITSET_WORDBITS ? ~0 : BITSET_BIT(b) - 1)
+#define BITSET_RANGE(b, e) (BITSET_MASK((e) + 1) & ~BITSET_MASK(b))
+
+/* bit range operations
+ */
+#define BITSET_TEST_RANGE(x, b, e) \
+   (BITSET_BITWORD(b) == BITSET_BITWORD(e) ? \
+   ((x)[BITSET_BITWORD(b)] & BITSET_RANGE(b, e)) : \
+   (assert (!"BITSET_TEST_RANGE: bit range crosses word boundary"), 0))
+#define BITSET_SET_RANGE(x, b, e) \
+   (BITSET_BITWORD(b) == BITSET_BITWORD(e) ? \
+   ((x)[BITSET_BITWORD(b)] |= BITSET_RANGE(b, e)) : \
+   (assert (!"BITSET_SET_RANGE: bit range crosses word boundary"), 0))
+#define BITSET_CLEAR_RANGE(x, b, e) \
+   (BITSET_BITWORD(b) == BITSET_BITWORD(e) ? \
+   ((x)[BITSET_BITWORD(b)] &= ~BITSET_RANGE(b, e)) : \
+   (assert (!"BITSET_CLEAR_RANGE: bit range crosses word boundary"), 0))
+
+/* Get first bit set in a bitset.
+ */
+static inline int
+__bitset_ffs(const BITSET_WORD *x, int n)
+{
+   int i;
+
+   for (i = 0; i < n; i++) {
+      if (x[i])
+	 return ffs(x[i]) + BITSET_WORDBITS * i;
+   }
+
+   return 0;
+}
+
+#define BITSET_FFS(x) __bitset_ffs(x, Elements(x))
+
+#endif