+++ /dev/null
-/*
- * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- *
- * Further, this software is distributed without any warranty that it is
- * free of the rightful claim of any third person regarding infringement
- * or the like. Any license provided herein, whether implied or
- * otherwise, applies only to this software file. Patent licenses, if
- * any, provided herein do not apply to combinations of this program with
- * other software, or any other product whatsoever.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write the Free Software Foundation, Inc., 59
- * Temple Place - Suite 330, Boston MA 02111-1307, USA.
- *
- * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
- * Mountain View, CA 94043, or:
- *
- * http://www.sgi.com
- *
- * For further information regarding this notice, see:
- *
- * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
- */
-
-/*
- * XFS bit manipulation routines, used in non-realtime code.
- */
-
-#include <xfs.h>
-
-/*
- * Index of low bit number in byte, -1 for none set, 0..7 otherwise.
- */
-const char xfs_lowbit[256] = {
- -1, 0, 1, 0, 2, 0, 1, 0, /* 00 .. 07 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* 08 .. 0f */
- 4, 0, 1, 0, 2, 0, 1, 0, /* 10 .. 17 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* 18 .. 1f */
- 5, 0, 1, 0, 2, 0, 1, 0, /* 20 .. 27 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* 28 .. 2f */
- 4, 0, 1, 0, 2, 0, 1, 0, /* 30 .. 37 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* 38 .. 3f */
- 6, 0, 1, 0, 2, 0, 1, 0, /* 40 .. 47 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* 48 .. 4f */
- 4, 0, 1, 0, 2, 0, 1, 0, /* 50 .. 57 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* 58 .. 5f */
- 5, 0, 1, 0, 2, 0, 1, 0, /* 60 .. 67 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* 68 .. 6f */
- 4, 0, 1, 0, 2, 0, 1, 0, /* 70 .. 77 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* 78 .. 7f */
- 7, 0, 1, 0, 2, 0, 1, 0, /* 80 .. 87 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* 88 .. 8f */
- 4, 0, 1, 0, 2, 0, 1, 0, /* 90 .. 97 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* 98 .. 9f */
- 5, 0, 1, 0, 2, 0, 1, 0, /* a0 .. a7 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* a8 .. af */
- 4, 0, 1, 0, 2, 0, 1, 0, /* b0 .. b7 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* b8 .. bf */
- 6, 0, 1, 0, 2, 0, 1, 0, /* c0 .. c7 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* c8 .. cf */
- 4, 0, 1, 0, 2, 0, 1, 0, /* d0 .. d7 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* d8 .. df */
- 5, 0, 1, 0, 2, 0, 1, 0, /* e0 .. e7 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* e8 .. ef */
- 4, 0, 1, 0, 2, 0, 1, 0, /* f0 .. f7 */
- 3, 0, 1, 0, 2, 0, 1, 0, /* f8 .. ff */
-};
-
-/*
- * Index of high bit number in byte, -1 for none set, 0..7 otherwise.
- */
-const char xfs_highbit[256] = {
- -1, 0, 1, 1, 2, 2, 2, 2, /* 00 .. 07 */
- 3, 3, 3, 3, 3, 3, 3, 3, /* 08 .. 0f */
- 4, 4, 4, 4, 4, 4, 4, 4, /* 10 .. 17 */
- 4, 4, 4, 4, 4, 4, 4, 4, /* 18 .. 1f */
- 5, 5, 5, 5, 5, 5, 5, 5, /* 20 .. 27 */
- 5, 5, 5, 5, 5, 5, 5, 5, /* 28 .. 2f */
- 5, 5, 5, 5, 5, 5, 5, 5, /* 30 .. 37 */
- 5, 5, 5, 5, 5, 5, 5, 5, /* 38 .. 3f */
- 6, 6, 6, 6, 6, 6, 6, 6, /* 40 .. 47 */
- 6, 6, 6, 6, 6, 6, 6, 6, /* 48 .. 4f */
- 6, 6, 6, 6, 6, 6, 6, 6, /* 50 .. 57 */
- 6, 6, 6, 6, 6, 6, 6, 6, /* 58 .. 5f */
- 6, 6, 6, 6, 6, 6, 6, 6, /* 60 .. 67 */
- 6, 6, 6, 6, 6, 6, 6, 6, /* 68 .. 6f */
- 6, 6, 6, 6, 6, 6, 6, 6, /* 70 .. 77 */
- 6, 6, 6, 6, 6, 6, 6, 6, /* 78 .. 7f */
- 7, 7, 7, 7, 7, 7, 7, 7, /* 80 .. 87 */
- 7, 7, 7, 7, 7, 7, 7, 7, /* 88 .. 8f */
- 7, 7, 7, 7, 7, 7, 7, 7, /* 90 .. 97 */
- 7, 7, 7, 7, 7, 7, 7, 7, /* 98 .. 9f */
- 7, 7, 7, 7, 7, 7, 7, 7, /* a0 .. a7 */
- 7, 7, 7, 7, 7, 7, 7, 7, /* a8 .. af */
- 7, 7, 7, 7, 7, 7, 7, 7, /* b0 .. b7 */
- 7, 7, 7, 7, 7, 7, 7, 7, /* b8 .. bf */
- 7, 7, 7, 7, 7, 7, 7, 7, /* c0 .. c7 */
- 7, 7, 7, 7, 7, 7, 7, 7, /* c8 .. cf */
- 7, 7, 7, 7, 7, 7, 7, 7, /* d0 .. d7 */
- 7, 7, 7, 7, 7, 7, 7, 7, /* d8 .. df */
- 7, 7, 7, 7, 7, 7, 7, 7, /* e0 .. e7 */
- 7, 7, 7, 7, 7, 7, 7, 7, /* e8 .. ef */
- 7, 7, 7, 7, 7, 7, 7, 7, /* f0 .. f7 */
- 7, 7, 7, 7, 7, 7, 7, 7, /* f8 .. ff */
-};
-
-/*
- * Count of bits set in byte, 0..8.
- */
-const char xfs_countbit[256] = {
- 0, 1, 1, 2, 1, 2, 2, 3, /* 00 .. 07 */
- 1, 2, 2, 3, 2, 3, 3, 4, /* 08 .. 0f */
- 1, 2, 2, 3, 2, 3, 3, 4, /* 10 .. 17 */
- 2, 3, 3, 4, 3, 4, 4, 5, /* 18 .. 1f */
- 1, 2, 2, 3, 2, 3, 3, 4, /* 20 .. 27 */
- 2, 3, 3, 4, 3, 4, 4, 5, /* 28 .. 2f */
- 2, 3, 3, 4, 3, 4, 4, 5, /* 30 .. 37 */
- 3, 4, 4, 5, 4, 5, 5, 6, /* 38 .. 3f */
- 1, 2, 2, 3, 2, 3, 3, 4, /* 40 .. 47 */
- 2, 3, 3, 4, 3, 4, 4, 5, /* 48 .. 4f */
- 2, 3, 3, 4, 3, 4, 4, 5, /* 50 .. 57 */
- 3, 4, 4, 5, 4, 5, 5, 6, /* 58 .. 5f */
- 2, 3, 3, 4, 3, 4, 4, 5, /* 60 .. 67 */
- 3, 4, 4, 5, 4, 5, 5, 6, /* 68 .. 6f */
- 3, 4, 4, 5, 4, 5, 5, 6, /* 70 .. 77 */
- 4, 5, 5, 6, 5, 6, 6, 7, /* 78 .. 7f */
- 1, 2, 2, 3, 2, 3, 3, 4, /* 80 .. 87 */
- 2, 3, 3, 4, 3, 4, 4, 5, /* 88 .. 8f */
- 2, 3, 3, 4, 3, 4, 4, 5, /* 90 .. 97 */
- 3, 4, 4, 5, 4, 5, 5, 6, /* 98 .. 9f */
- 2, 3, 3, 4, 3, 4, 4, 5, /* a0 .. a7 */
- 3, 4, 4, 5, 4, 5, 5, 6, /* a8 .. af */
- 3, 4, 4, 5, 4, 5, 5, 6, /* b0 .. b7 */
- 4, 5, 5, 6, 5, 6, 6, 7, /* b8 .. bf */
- 2, 3, 3, 4, 3, 4, 4, 5, /* c0 .. c7 */
- 3, 4, 4, 5, 4, 5, 5, 6, /* c8 .. cf */
- 3, 4, 4, 5, 4, 5, 5, 6, /* d0 .. d7 */
- 4, 5, 5, 6, 5, 6, 6, 7, /* d8 .. df */
- 3, 4, 4, 5, 4, 5, 5, 6, /* e0 .. e7 */
- 4, 5, 5, 6, 5, 6, 6, 7, /* e8 .. ef */
- 4, 5, 5, 6, 5, 6, 6, 7, /* f0 .. f7 */
- 5, 6, 6, 7, 6, 7, 7, 8, /* f8 .. ff */
-};
-
-/*
- * xfs_highbit32: get high bit set out of 32-bit argument, -1 if none set.
- */
-int
-xfs_highbit32(
- __uint32_t v)
-{
- int i;
-
- if (v & 0xffff0000)
- if (v & 0xff000000)
- i = 24;
- else
- i = 16;
- else if (v & 0x0000ffff)
- if (v & 0x0000ff00)
- i = 8;
- else
- i = 0;
- else
- return -1;
- return i + xfs_highbit[(v >> i) & 0xff];
-}
-
-/*
- * xfs_lowbit64: get low bit set out of 64-bit argument, -1 if none set.
- */
-int
-xfs_lowbit64(
- __uint64_t v)
-{
- int i;
-#if XFS_64
- if (v & 0x00000000ffffffff)
- if (v & 0x000000000000ffff)
- if (v & 0x00000000000000ff)
- i = 0;
- else
- i = 8;
- else
- if (v & 0x0000000000ff0000)
- i = 16;
- else
- i = 24;
- else if (v & 0xffffffff00000000)
- if (v & 0x0000ffff00000000)
- if (v & 0x000000ff00000000)
- i = 32;
- else
- i = 40;
- else
- if (v & 0x00ff000000000000)
- i = 48;
- else
- i = 56;
- else
- return -1;
- return i + xfs_lowbit[(v >> i) & 0xff];
-#else
- __uint32_t vw;
-
- if ((vw = v)) {
- if (vw & 0x0000ffff)
- if (vw & 0x000000ff)
- i = 0;
- else
- i = 8;
- else
- if (vw & 0x00ff0000)
- i = 16;
- else
- i = 24;
- return i + xfs_lowbit[(vw >> i) & 0xff];
- } else if ((vw = v >> 32)) {
- if (vw & 0x0000ffff)
- if (vw & 0x000000ff)
- i = 32;
- else
- i = 40;
- else
- if (vw & 0x00ff0000)
- i = 48;
- else
- i = 56;
- return i + xfs_lowbit[(vw >> (i - 32)) & 0xff];
- } else
- return -1;
-#endif
-}
-
-/*
- * xfs_highbit64: get high bit set out of 64-bit argument, -1 if none set.
- */
-int
-xfs_highbit64(
- __uint64_t v)
-{
- int i;
-#if XFS_64
- if (v & 0xffffffff00000000)
- if (v & 0xffff000000000000)
- if (v & 0xff00000000000000)
- i = 56;
- else
- i = 48;
- else
- if (v & 0x0000ff0000000000)
- i = 40;
- else
- i = 32;
- else if (v & 0x00000000ffffffff)
- if (v & 0x00000000ffff0000)
- if (v & 0x00000000ff000000)
- i = 24;
- else
- i = 16;
- else
- if (v & 0x000000000000ff00)
- i = 8;
- else
- i = 0;
- else
- return -1;
- return i + xfs_highbit[(v >> i) & 0xff];
-#else
- __uint32_t vw;
-
- if ((vw = v >> 32)) {
- if (vw & 0xffff0000)
- if (vw & 0xff000000)
- i = 56;
- else
- i = 48;
- else
- if (vw & 0x0000ff00)
- i = 40;
- else
- i = 32;
- return i + xfs_highbit[(vw >> (i - 32)) & 0xff];
- } else if ((vw = v)) {
- if (vw & 0xffff0000)
- if (vw & 0xff000000)
- i = 24;
- else
- i = 16;
- else
- if (vw & 0x0000ff00)
- i = 8;
- else
- i = 0;
- return i + xfs_highbit[(vw >> i) & 0xff];
- } else
- return -1;
-#endif
-}
projects / thirdparty / xfsprogs-dev.git / commitdiff
