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annotate gcc/testsuite/gcc.dg/strlenopt-41.c @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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131
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1 /* PR tree-optimization/83671 - fix for false positive reported by
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2 -Wstringop-overflow does not work with inlining
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3 Verify that the length the empty string is folded to zero even at -O1
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4 regardless of offset into it.
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5 Also verify that the length of a non-empty string isn't folded given
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6 a variable offset.
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7 { dg-do compile }
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8 { dg-options "-O1 -fdump-tree-optimized" } */
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9
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10 #include "strlenopt.h"
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11
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12 inline unsigned length (const char *s)
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13 {
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14 return __builtin_strlen (s);
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15 }
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16
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17 void check_length_cst (int i)
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18 {
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19 unsigned len = length (&""[i]);
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20
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21 if (len)
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22 __builtin_abort ();
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23 }
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24
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25 void check_length_var (int i)
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26 {
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27 unsigned len = length (&"1"[i]);
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28
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29 if (len != 1)
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30 __builtin_abort ();
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31 }
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32
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33 /* { dg-final { scan-tree-dump-times "abort" 1 "optimized" } }
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34 { dg-final { scan-tree-dump-times "strlen" 1 "optimized" } } */