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comparison gcc/testsuite/gcc.dg/strlenopt-10.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents
children 1830386684a0
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68:561a7518be6b 111:04ced10e8804
1 /* { dg-do run } */
2 /* { dg-options "-O2 -fdump-tree-strlen" } */
3
4 #include "strlenopt.h"
5
6 __attribute__((noinline, noclone)) size_t
7 fn1 (char *p)
8 {
9 char *q;
10 /* This can be optimized into memcpy and the size can be decreased to one,
11 as it is immediately overwritten. */
12 strcpy (p, "z");
13 q = strchr (p, '\0');
14 *q = 32;
15 /* This strlen can't be optimized away, string length is unknown here. */
16 return strlen (p);
17 }
18
19 __attribute__((noinline, noclone)) void
20 fn2 (char *p, const char *z, size_t *lp)
21 {
22 char *q, *r;
23 char buf[64];
24 size_t l[10];
25 /* The first strlen stays, all the strcpy calls can be optimized
26 into memcpy and all other strlen calls and all strchr calls
27 optimized away. */
28 l[0] = strlen (z);
29 strcpy (buf, z);
30 strcpy (p, "abcde");
31 q = strchr (p, '\0');
32 strcpy (q, "efghi");
33 r = strchr (q, '\0');
34 strcpy (r, "jkl");
35 l[1] = strlen (p);
36 l[2] = strlen (q);
37 l[3] = strlen (r);
38 strcpy (r, buf);
39 l[4] = strlen (p);
40 l[5] = strlen (q);
41 l[6] = strlen (r);
42 strcpy (r, "mnopqr");
43 l[7] = strlen (p);
44 l[8] = strlen (q);
45 l[9] = strlen (r);
46 memcpy (lp, l, sizeof l);
47 }
48
49 int
50 main ()
51 {
52 char buf[64];
53 size_t l[10];
54 const char *volatile z = "ABCDEFG";
55 memset (buf, '\0', sizeof buf);
56 if (fn1 (buf) != 2 || buf[0] != 'z' || buf[1] != 32 || buf[2] != '\0')
57 abort ();
58 fn2 (buf, z, l);
59 if (memcmp (buf, "abcdeefghimnopqr", 17) != 0)
60 abort ();
61 if (l[0] != 7)
62 abort ();
63 if (l[1] != 13 || l[2] != 8 || l[3] != 3)
64 abort ();
65 if (l[4] != 17 || l[5] != 12 || l[6] != 7)
66 abort ();
67 if (l[7] != 16 || l[8] != 11 || l[9] != 6)
68 abort ();
69 return 0;
70 }
71
72 /* { dg-final { scan-tree-dump-times "strlen \\(" 2 "strlen" } } */
73 /* avr has BIGGEST_ALIGNMENT 8, allowing fold_builtin_memory_op
74 to expand the memcpy call at the end of fn2. */
75 /* { dg-final { scan-tree-dump-times "memcpy \\(" 8 "strlen" { target { ! avr-*-* } } } } */
76 /* { dg-final { scan-tree-dump-times "memcpy \\(" 7 "strlen" { target { avr-*-* } } } } */
77 /* { dg-final { scan-tree-dump-times "strcpy \\(" 0 "strlen" } } */
78 /* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" } } */
79 /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen" } } */
80 /* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen" } } */
81 /* { dg-final { scan-tree-dump-times "\\*q_\[0-9\]* = 32;" 1 "strlen" } } */
82 /* { dg-final { scan-tree-dump-times "memcpy \\(\[^\n\r\]*, 1\\)" 1 "strlen" } } */