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145
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1 /* PR tree-optimization/83821 - local aggregate initialization defeats
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2 strlen optimization
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3 { dg-do compile }
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4 { dg-options "-O2 -Wall -fdump-tree-optimized" } */
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5
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6 #include "strlenopt.h"
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7 char *p_p2, *p_p5, *p_p9, *p_p14;
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8
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9 unsigned n0, n1, n2, n3, n4;
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10
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11
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12 static inline __attribute__ ((always_inline)) void
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13 elim_strlen_of_consecutive_strcpy (char *p)
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14 {
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15 p_p2 = p + 2;
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16 __builtin_strcpy (p_p2, "12");
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17
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18 p_p5 = p_p2 + 3;
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19 __builtin_strcpy (p_p5, "124");
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20
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21 p_p9 = p_p5 + 4;
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22 __builtin_strcpy (p_p9, "1245");
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23
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24 p_p14 = p_p9 + 5;
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25
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26 n0 = __builtin_strlen (p);
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27 n1 = __builtin_strlen (p_p2);
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28 n2 = __builtin_strlen (p_p5);
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29 n3 = __builtin_strlen (p_p9);
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30
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31 /* The following isn't handled yet:
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32 n4 = __builtin_strlen (p_p14); */
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33
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34 if (n0 || n1 != 2 || n2 != 3 || n3 != 4)
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35 __builtin_abort ();
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36 }
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37
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38
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39 void elim_strlen_of_consecutive_strcpy_in_alloca (unsigned n)
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40 {
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41 /* Only known sizes are handled so far. */
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42 n = 14;
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43
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44 char *p = __builtin_alloca (n);
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45
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46 *p = '\0';
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47
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48 elim_strlen_of_consecutive_strcpy (p);
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49 }
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50
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51
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52 void elim_strlen_of_consecutive_strcpy_in_vla (unsigned n)
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53 {
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54 /* Only known sizes are handled so far. */
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55 n = 14;
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56
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57 char vla[n];
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58
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59 *vla = '\0';
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60
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61 elim_strlen_of_consecutive_strcpy (vla);
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62 }
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63
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64 void elim_strlen_of_consecutive_strcpy_in_malloc (unsigned n)
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65 {
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66 char *p = __builtin_malloc (n);
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67
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68 *p = '\0';
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69
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70 elim_strlen_of_consecutive_strcpy (p);
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71 }
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72
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73
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74 void elim_strlen_of_consecutive_strcpy_in_calloc (unsigned n)
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75 {
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76 char *p = __builtin_calloc (n, 1);
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77
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78 /* Do not store into *P to verify that strlen knows it's zero. */
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79
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80 elim_strlen_of_consecutive_strcpy (p);
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81 }
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82
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83 /* { dg-final { scan-tree-dump-not "abort" "optimized" } } */
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