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comparison gcc/testsuite/gcc.dg/strlenopt-86.c @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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131:84e7813d76e9 145:1830386684a0
1 /* PR tree-optimization/83821 - local aggregate initialization defeats
2 strlen optimization
3 Verify that a strlen() call is not eliminated for a pointer to a region
4 of memory allocated by calloc() if a byte is written into the region
5 that isn't known to be nul.
6 { dg-do compile }
7 { dg-options "-O2 -fdump-tree-optimized" } */
8
9 unsigned n0, n1;
10
11 void*
12 keep_strlen_calloc_store_cst_memset (int i, unsigned a, unsigned b)
13 {
14 char *p = __builtin_calloc (a, 1);
15
16 p[i] = 'x';
17
18 __builtin_memset (p, 0, b);
19
20 n0 = __builtin_strlen (p);
21
22 return p;
23 }
24
25 void*
26 keep_strlen_calloc_store_var_memset (int i, int x, unsigned a, unsigned b)
27 {
28 char *p = __builtin_calloc (a, 1);
29
30 p[i] = x;
31
32 __builtin_memset (p, 0, b);
33
34 n0 = __builtin_strlen (p);
35
36 return p;
37 }
38
39 void*
40 keep_strlen_calloc_store_memset_2 (int i, int x, unsigned a, unsigned b, unsigned c)
41 {
42 char *p = __builtin_calloc (a, 1);
43
44 p[i] = x;
45 __builtin_memset (p, 0, b);
46
47 n0 = __builtin_strlen (p);
48
49 p[3] = x;
50 __builtin_memset (p, 0, c);
51
52 n1 = __builtin_strlen (p);
53
54 return p;
55 }
56
57 /* { dg-final { scan-tree-dump-times "__builtin_strlen" 4 "optimized" } } */