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| 24 | #include <cstring> |
24 | #include <cstring> |
| 25 | #include <inttypes.h> |
25 | #include <inttypes.h> |
| 26 | |
26 | |
| 27 | #include "rxvtutil.h" |
27 | #include "rxvtutil.h" |
| 28 | |
28 | |
| 29 | class byteorder byteorder; |
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| 30 | |
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| 31 | unsigned int byteorder::e; |
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| 32 | |
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| 33 | byteorder::byteorder () |
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| 34 | { |
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| 35 | union { |
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| 36 | uint32_t u; |
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| 37 | uint8_t b[4]; |
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| 38 | } w; |
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| 39 | |
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| 40 | w.b[0] = 0x11; |
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| 41 | w.b[1] = 0x22; |
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| 42 | w.b[2] = 0x33; |
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| 43 | w.b[3] = 0x44; |
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| 44 | |
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| 45 | e = w.u; |
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| 46 | } |
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| 47 | |
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| 48 | #if !HAVE_GCC_BUILTINS |
29 | #if !HAVE_GCC_BUILTINS |
| 49 | int ctz (unsigned int x) CONST |
30 | int rxvt_ctz (unsigned int x) CONST |
| 50 | { |
31 | { |
| 51 | int r = 0; |
32 | int r = 0; |
| 52 | |
33 | |
| 53 | x &= -x; // this isolates the lowest bit |
34 | x &= -x; // this isolates the lowest bit |
| 54 | |
35 | |
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| 59 | if (x & 0xffff0000) r += 16; |
40 | if (x & 0xffff0000) r += 16; |
| 60 | |
41 | |
| 61 | return r; |
42 | return r; |
| 62 | } |
43 | } |
| 63 | |
44 | |
| 64 | int popcount (unsigned int x) CONST |
45 | int rxvt_popcount (unsigned int x) CONST |
| 65 | { |
46 | { |
| 66 | x -= (x >> 1) & 0x55555555; |
47 | x -= (x >> 1) & 0x55555555; |
| 67 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
48 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
| 68 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
49 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
| 69 | x *= 0x01010101; |
50 | x *= 0x01010101; |
