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1 | /*--------------------------------*-C-*---------------------------------* |
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2 | * File: rxvtutil.C |
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3 | *----------------------------------------------------------------------* |
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4 | * |
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5 | * All portions of code are copyright by their respective author/s. |
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6 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
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7 | * |
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8 | * This program is free software; you can redistribute it and/or modify |
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9 | * it under the terms of the GNU General Public License as published by |
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10 | * the Free Software Foundation; either version 2 of the License, or |
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11 | * (at your option) any later version. |
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12 | * |
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13 | * This program is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | * GNU General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with this program; if not, write to the Free Software |
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20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 | *----------------------------------------------------------------------*/ |
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22 | |
| 1 | #include <cstdlib> |
23 | #include <cstdlib> |
| 2 | #include <cstring> |
24 | #include <cstring> |
| 3 | #include <inttypes.h> |
25 | #include <inttypes.h> |
| 4 | |
26 | |
| 5 | #include "rxvtutil.h" |
27 | #include "rxvtutil.h" |
| … | |
… | |
| 22 | |
44 | |
| 23 | e = w.u; |
45 | e = w.u; |
| 24 | } |
46 | } |
| 25 | |
47 | |
| 26 | #if !HAVE_GCC_BUILTINS |
48 | #if !HAVE_GCC_BUILTINS |
| 27 | int ctz (unsigned int x) |
49 | int ctz (unsigned int x) CONST |
| 28 | { |
50 | { |
| 29 | int r = 0; |
51 | int r = 0; |
| 30 | |
52 | |
| 31 | x &= -x; // this isolates the lowest bit |
53 | x &= -x; // this isolates the lowest bit |
| 32 | |
54 | |
| … | |
… | |
| 37 | if (x & 0xffff0000) r += 16; |
59 | if (x & 0xffff0000) r += 16; |
| 38 | |
60 | |
| 39 | return r; |
61 | return r; |
| 40 | } |
62 | } |
| 41 | |
63 | |
| 42 | int popcount (unsigned int x) |
64 | int popcount (unsigned int x) CONST |
| 43 | { |
65 | { |
| 44 | x -= (x >> 1) & 0x55555555; |
66 | x -= (x >> 1) & 0x55555555; |
| 45 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
67 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
| 46 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
68 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
| 47 | x *= 0x01010101; |
69 | x *= 0x01010101; |
