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145
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1 /* PR tree-optimization/92226 - live nul char store to array eliminated
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2 { dg-do compile }
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3 { dg-options "-O2 -fdump-tree-strlen" } */
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4
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5 #include "strlenopt.h"
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6
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7 #define NOIPA __attribute__ ((noipa))
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8
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9 /* Verify that the nul store into the destination is only eliminated
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10 when overwrites the existing terminating nul added by the strcpy call.
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11 Also verify that the second strlen call is eliminated in all cases. */
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12 #define T(SIZE, IDX) \
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13 NOIPA void test_ ## SIZE ## _store_nul_ ## IDX (const char *s) \
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14 { \
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15 extern char a ## SIZE[SIZE]; \
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16 char *d = a ## SIZE; \
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17 size_t len = SIZE - 1; \
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18 size_t idx = IDX; \
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19 if (strlen (s) == len) \
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20 { \
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21 strcpy (d, s); \
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22 d[idx] = 0; \
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23 if (strlen (d) != idx) \
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24 abort (); \
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25 } \
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26 } typedef void dummy_type
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27
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28
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29 T (1, 0); // expect nul store to be eliminated
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30
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31 T (2, 0); // nul store must be retained
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32 T (2, 1); // expect nul store to be eliminated
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33
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34 // Same as above but for larger arrays.
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35 T (3, 0);
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36 T (3, 1);
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37 T (3, 2);
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38
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39 T (4, 0);
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40 T (4, 1);
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41 T (4, 2);
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42 T (4, 3);
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43
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44 T (5, 0);
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45 T (5, 1);
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46 T (5, 2);
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47 T (5, 3);
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48 T (5, 4);
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49
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50 T (6, 0);
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51 T (6, 1);
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52 T (6, 2);
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53 T (6, 3);
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54 T (6, 4);
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55 T (6, 5);
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56
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57 T (7, 0);
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58 T (7, 1);
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59 T (7, 2);
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60 T (7, 3);
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61 T (7, 4);
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62 T (7, 5);
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63 T (7, 6);
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64
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65 T (8, 0);
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66 T (8, 1);
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67 T (8, 2);
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68 T (8, 3);
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69 T (8, 4);
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70 T (8, 5);
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71 T (8, 6);
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72 T (8, 7);
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73
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74 /* Verify that each function makes just one call to strlen to compute
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75 the length of its argument (and not also to compute the length of
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76 the copy):
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77 { dg-final { scan-tree-dump-times "strlen \\(s_" 36 "strlen1" } }
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78 { dg-final { scan-tree-dump-not "strlen \\(\\&a" "strlen1" } }
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79
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80 Verify that nul stores into the last array element have been eliminated
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81 (they are preceded by a strcpy storing into all the elements of the array:
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82 { dg-final { scan-tree-dump-not "a1\\\] = 0;" "strlen1" } }
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83 { dg-final { scan-tree-dump-not "a2 \\\+ 1B\\\] = 0;" "strlen1" } }
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84 { dg-final { scan-tree-dump-not "a3 \\\+ 2B\\\] = 0;" "strlen1" } }
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85 { dg-final { scan-tree-dump-not "a4 \\\+ 3B\\\] = 0;" "strlen1" } }
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86 { dg-final { scan-tree-dump-not "a5 \\\+ 4B\\\] = 0;" "strlen1" } }
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87 { dg-final { scan-tree-dump-not "a6 \\\+ 5B\\\] = 0;" "strlen1" } }
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88 { dg-final { scan-tree-dump-not "a7 \\\+ 6B\\\] = 0;" "strlen1" } }
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89 { dg-final { scan-tree-dump-not "a8 \\\+ 7B\\\] = 0;" "strlen1" } } */
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