Last change
on this file was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
771 bytes
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Line | |
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1 | /* Copyright (c) 2017 SiFive Inc. All rights reserved. |
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2 | |
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3 | This copyrighted material is made available to anyone wishing to use, |
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4 | modify, copy, or redistribute it subject to the terms and conditions |
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5 | of the FreeBSD License. This program is distributed in the hope that |
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6 | it will be useful, but WITHOUT ANY WARRANTY expressed or implied, |
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7 | including the implied warranties of MERCHANTABILITY or FITNESS FOR |
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8 | A PARTICULAR PURPOSE. A copy of this license is available at |
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9 | http://www.opensource.org/licenses. |
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10 | */ |
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11 | #include <strings.h> |
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12 | |
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13 | int |
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14 | ffs (int word) |
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15 | { |
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16 | #if __riscv_xlen == 32 |
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17 | return (__builtin_ffs (word)); |
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18 | #else |
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19 | int i; |
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20 | |
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21 | if (!word) |
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22 | return 0; |
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23 | |
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24 | i = 0; |
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25 | for (;;) |
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26 | { |
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27 | if (((1 << i++) & word) != 0) |
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28 | return i; |
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29 | } |
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30 | return 0; |
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31 | #endif |
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32 | } |
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