Last change
on this file since 444 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:
1.7 KB
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Line | |
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1 | /* |
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2 | * strlen.c -- strlen function. On at least some MIPS chips, a simple |
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3 | * strlen is faster than the 'optimized' C version. |
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4 | * |
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5 | * Copyright (c) 2001, 2002 Red Hat, Inc. |
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6 | * |
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7 | * The authors hereby grant permission to use, copy, modify, distribute, |
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8 | * and license this software and its documentation for any purpose, provided |
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9 | * that existing copyright notices are retained in all copies and that this |
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10 | * notice is included verbatim in any distributions. No written agreement, |
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11 | * license, or royalty fee is required for any of the authorized uses. |
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12 | * Modifications to this software may be copyrighted by their authors |
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13 | * and need not follow the licensing terms described here, provided that |
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14 | * the new terms are clearly indicated on the first page of each file where |
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15 | * they apply. |
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16 | */ |
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17 | |
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18 | #include <stddef.h> |
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19 | #include <string.h> |
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20 | |
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21 | /* MIPS16 needs to come first. */ |
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22 | |
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23 | #if defined(__mips16) |
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24 | size_t |
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25 | strlen (const char *str) |
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26 | { |
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27 | const char *start = str; |
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28 | |
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29 | while (*str++ != '\0') |
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30 | ; |
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31 | |
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32 | return str - start - 1; |
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33 | } |
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34 | #elif defined(__mips64) |
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35 | __asm__("" /* 64-bit MIPS targets */ |
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36 | " .set noreorder\n" |
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37 | " .set nomacro\n" |
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38 | " .globl strlen\n" |
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39 | " .ent strlen\n" |
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40 | "strlen:\n" |
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41 | " daddiu $2,$4,1\n" |
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42 | "\n" |
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43 | "1: lbu $3,0($4)\n" |
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44 | " bnez $3,1b\n" |
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45 | " daddiu $4,$4,1\n" |
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46 | "\n" |
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47 | " jr $31\n" |
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48 | " dsubu $2,$4,$2\n" |
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49 | " .end strlen\n" |
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50 | " .set macro\n" |
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51 | " .set reorder\n"); |
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52 | |
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53 | #else |
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54 | __asm__("" /* 32-bit MIPS targets */ |
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55 | " .set noreorder\n" |
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56 | " .set nomacro\n" |
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57 | " .globl strlen\n" |
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58 | " .ent strlen\n" |
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59 | "strlen:\n" |
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60 | " addiu $2,$4,1\n" |
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61 | "\n" |
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62 | "1: lbu $3,0($4)\n" |
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63 | #if defined(_R3000) |
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64 | " nop \n" |
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65 | #endif |
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66 | " bnez $3,1b\n" |
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67 | " addiu $4,$4,1\n" |
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68 | "\n" |
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69 | " jr $31\n" |
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70 | " subu $2,$4,$2\n" |
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71 | " .end strlen\n" |
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72 | " .set macro\n" |
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73 | " .set reorder\n"); |
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74 | #endif |
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