File: ldist-strlen-2.c

package info (click to toggle)
gcc-arm-none-eabi 15%3A14.2.rel1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,099,328 kB
  • sloc: cpp: 3,627,108; ansic: 2,571,498; ada: 834,230; f90: 235,082; makefile: 79,231; asm: 74,984; xml: 51,692; exp: 39,736; sh: 33,298; objc: 15,629; python: 15,069; fortran: 14,429; pascal: 7,003; awk: 5,070; perl: 3,106; ml: 285; lisp: 253; lex: 204; haskell: 135
file content (58 lines) | stat: -rw-r--r-- 1,000 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
 
/* { dg-do run } */
/* { dg-options "-O2 -ftree-loop-distribution -fdump-tree-ldist-details" } */
/* { dg-final { scan-tree-dump-times "generated strlenQI\n" 3 "ldist" } } */

#include <assert.h>

typedef __SIZE_TYPE__ size_t;
extern void* malloc (size_t);
extern void* memset (void*, int, size_t);

__attribute__((noinline))
int test_pos (char *s)
{
  int i;
  for (i=42; s[i]; ++i);
  return i;
}

__attribute__((noinline))
int test_neg (char *s)
{
  int i;
  for (i=-42; s[i]; ++i);
  return i;
}

__attribute__((noinline))
int test_including_null_char (char *s)
{
  int i;
  for (i=1; s[i-1]; ++i);
  return i;
}

int main(void)
{
  void *p = malloc (1024);
  assert (p);
  memset (p, 0xf, 1024);
  char *s = (char *)p + 100;

  s[42+13] = 0;
  assert (test_pos (s) == 42+13);
  s[42+13] = 0xf;

  s[13] = 0;
  assert (test_neg (s) == 13);
  s[13] = 0xf;

  s[-13] = 0;
  assert (test_neg (s) == -13);
  s[-13] = 0xf;

  s[13] = 0;
  assert (test_including_null_char (s) == 13+1);

  return 0;
}