File: vrp14.c

package info (click to toggle)
gcc-arm-none-eabi 15%3A8-2019-q3-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 571,828 kB
  • sloc: ansic: 2,937,651; cpp: 881,644; ada: 597,189; makefile: 65,528; asm: 56,499; xml: 46,621; exp: 24,747; sh: 19,684; python: 7,256; pascal: 4,370; awk: 3,497; perl: 2,695; yacc: 316; ml: 285; f90: 234; lex: 198; objc: 194; haskell: 119
file content (48 lines) | stat: -rw-r--r-- 1,043 bytes parent folder | download | duplicates (10) 
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
 
/* { dg-do run } */
/* { dg-options "-O2" } */
/* { dg-require-effective-target int32plus } */

struct tree_decl
{
  union tree_decl_u1 {
    int f;
    long i;
    struct tree_decl_u1_a {
      unsigned int align : 24;
      unsigned int off_align : 8;
    } a;
  } u1;
};

extern void abort (void);

unsigned int
assemble_variable (struct tree_decl decl)
{
  unsigned int align;

  align = decl.u1.a.align;

  if (align > (1 << ((8 * 4) < 64 ? (8 * 4) - 2 : 62)))
    align = (1 << ((8 * 4) < 64 ? (8 * 4) - 2 : 62));

  /* VRP should not be propagating 0 to the RHS of this assignment.
     But it was erroneously applying a cast operation between types of
     different precision.  align is an unsigned int with range [0,
     0x4000000] but the .align field holds only 24 bits.  So the cast
     was returning a [0, 0] range.  */
  decl.u1.a.align = align;

  return decl.u1.a.align;
}

int
main ()
{
  struct tree_decl decl;
  decl.u1.a.align = 13;
  unsigned int x = assemble_variable (decl);
  if (x == 0)
    abort ();
  return 0;
}