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:
1.9 KB
|
Line | |
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1 | #if defined __thumb__ |
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2 | |
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3 | #include "../../string/strcmp.c" |
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4 | |
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5 | #else |
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6 | |
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7 | #include <string.h> |
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8 | #include "xscale.h" |
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9 | |
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10 | int |
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11 | strcmp (const char *s1, const char *s2) |
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12 | { |
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13 | asm (PRELOADSTR ("%0") : : "r" (s1)); |
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14 | asm (PRELOADSTR ("%0") : : "r" (s2)); |
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15 | |
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16 | #ifndef __OPTIMIZE_SIZE__ |
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17 | if (((long)s1 & 3) == ((long)s2 & 3)) |
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18 | { |
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19 | int result; |
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20 | |
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21 | /* Skip unaligned part. */ |
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22 | while ((long)s1 & 3) |
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23 | { |
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24 | if (*s1 == '\0' || *s1 != *s2) |
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25 | goto out; |
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26 | s1++; |
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27 | s2++; |
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28 | } |
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29 | |
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30 | /* Load two constants: |
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31 | lr = 0xfefefeff [ == ~(0x80808080 << 1) ] |
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32 | ip = 0x80808080 */ |
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33 | |
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34 | asm ( |
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35 | "ldr r2, [%1, #0]\n\ |
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36 | ldr r3, [%2, #0]\n\ |
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37 | cmp r2, r3\n\ |
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38 | bne 2f\n\ |
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39 | \n\ |
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40 | mov ip, #0x80\n\ |
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41 | add ip, ip, #0x8000\n\ |
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42 | add ip, ip, ip, lsl #16\n\ |
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43 | mvn lr, ip, lsl #1\n\ |
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44 | \n\ |
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45 | 0:\n\ |
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46 | ldr r2, [%1, #0]\n\ |
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47 | add r3, r2, lr\n\ |
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48 | bic r3, r3, r2\n\ |
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49 | tst r3, ip\n\ |
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50 | beq 1f\n\ |
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51 | mov %0, #0x0\n\ |
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52 | b 3f\n\ |
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53 | 1:\n\ |
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54 | ldr r2, [%1, #4]!\n\ |
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55 | ldr r3, [%2, #4]!\n\ |
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56 | " PRELOADSTR("%1") "\n\ |
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57 | " PRELOADSTR("%2") "\n\ |
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58 | cmp r2, r3\n\ |
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59 | beq 0b" |
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60 | |
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61 | /* The following part could be done in a C loop as well, but it needs |
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62 | to be assembler to save some cycles in the case where the optimized |
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63 | loop above finds the strings to be equal. */ |
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64 | "\n\ |
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65 | 2:\n\ |
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66 | ldrb r2, [%1, #0]\n\ |
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67 | " PRELOADSTR("%1") "\n\ |
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68 | " PRELOADSTR("%2") "\n\ |
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69 | cmp r2, #0x0\n\ |
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70 | beq 1f\n\ |
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71 | ldrb r3, [%2, #0]\n\ |
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72 | cmp r2, r3\n\ |
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73 | bne 1f\n\ |
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74 | 0:\n\ |
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75 | ldrb r3, [%1, #1]!\n\ |
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76 | add %2, %2, #1\n\ |
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77 | ands ip, r3, #0xff\n\ |
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78 | beq 1f\n\ |
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79 | ldrb r3, [%2]\n\ |
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80 | cmp ip, r3\n\ |
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81 | beq 0b\n\ |
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82 | 1:\n\ |
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83 | ldrb lr, [%1, #0]\n\ |
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84 | ldrb ip, [%2, #0]\n\ |
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85 | rsb %0, ip, lr\n\ |
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86 | 3:\n\ |
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87 | " |
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88 | |
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89 | : "=r" (result), "=&r" (s1), "=&r" (s2) |
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90 | : "1" (s1), "2" (s2) |
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91 | : "lr", "ip", "r2", "r3", "cc"); |
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92 | return result; |
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93 | } |
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94 | #endif |
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95 | |
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96 | while (*s1 != '\0' && *s1 == *s2) |
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97 | { |
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98 | asm (PRELOADSTR("%0") : : "r" (s1)); |
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99 | asm (PRELOADSTR("%0") : : "r" (s2)); |
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100 | s1++; |
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101 | s2++; |
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102 | } |
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103 | out: |
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104 | return (*(unsigned char *) s1) - (*(unsigned char *) s2); |
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105 | } |
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106 | |
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107 | #endif |
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