File: strlenopt-41.c

package info (click to toggle)
gcc-riscv64-unknown-elf 8.3.0.2019.08%2Bdfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 680,956 kB
  • sloc: ansic: 3,237,715; cpp: 896,882; ada: 772,854; f90: 144,254; asm: 68,788; makefile: 67,456; sh: 29,743; exp: 28,045; objc: 15,273; fortran: 11,885; python: 7,369; pascal: 5,375; awk: 3,725; perl: 2,872; yacc: 316; xml: 311; ml: 285; lex: 198; haskell: 122
file content (34 lines) | stat: -rw-r--r-- 834 bytes parent folder | download | duplicates (4) 
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
 
/* PR tree-optimization/83671 - fix for false positive reported by
   -Wstringop-overflow does not work with inlining
   Verify that the length the empty string is folded to zero even at -O1
   regardless of offset into it.
   Also verify that the length of a non-empty string isn't folded given
   a variable offset.
   { dg-do compile }
   { dg-options "-O1 -fdump-tree-optimized" } */

#include "strlenopt.h"

inline unsigned length (const char *s)
{
  return __builtin_strlen (s);
}

void check_length_cst (int i)
{
  unsigned len = length (&""[i]);

  if (len)
    __builtin_abort ();
}

void check_length_var (int i)
{
  unsigned len = length (&"1"[i]);

  if (len != 1)
    __builtin_abort ();
}

/* { dg-final { scan-tree-dump-times "abort" 1 "optimized" } }
   { dg-final { scan-tree-dump-times "strlen" 1 "optimized" } } */