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comparison gcc/testsuite/gcc.dg/pr83047.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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111:04ced10e8804 131:84e7813d76e9
1 /* PR tree-optimization/83047 */
2 /* { dg-do run { target mmap } } */
3 /* { dg-options "-O2" } */
4
5 #include <stddef.h>
6 #include <stdio.h>
7 #include <sys/mman.h>
8 #ifndef MAP_ANONYMOUS
9 #define MAP_ANONYMOUS MAP_ANON
10 #endif
11 #ifndef MAP_ANON
12 #define MAP_ANON 0
13 #endif
14 #ifndef MAP_FAILED
15 #define MAP_FAILED ((void *)-1)
16 #endif
17 #include <stdlib.h>
18
19 __attribute__((noipa)) void
20 foo (char *p, char *q, int r)
21 {
22 char a = q[0];
23 if (r || a == '\0')
24 return;
25 char b = q[1];
26 p[0] = a;
27 p[1] = b;
28 }
29
30 int
31 main ()
32 {
33 char *p = mmap (NULL, 131072, PROT_READ | PROT_WRITE,
34 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
35 if (p == MAP_FAILED)
36 return 0;
37 if (munmap (p + 65536, 65536) < 0)
38 return 0;
39 p[0] = 'c';
40 p[1] = 'd';
41 p[65536 - 2] = 'a';
42 p[65536 - 1] = 'b';
43 volatile int r = 1;
44 foo (p, p + 65536 - 2, r);
45 if (p[0] != 'c' || p[1] != 'd')
46 abort ();
47 r = 0;
48 foo (p, p + 65536 - 2, r);
49 if (p[0] != 'a' || p[1] != 'b')
50 abort ();
51 p[0] = 'e';
52 p[1] = 'f';
53 r = 1;
54 foo (p, p + 65536 - 1, r);
55 if (p[0] != 'e' || p[1] != 'f')
56 abort ();
57 return 0;
58 }